Railways NTPC (Technical Ability) Automobile Engineering Question Bank

done Automobile Engineering Total Questions - 120

• question_answer1)
  The voltage-current characteristics of a DC generator for arc welding is a straight line between an open circuit voltage of 80 V and short-circuit current of 300 A. The generator settings for maximum arc power will be:
  A)
  80 V and 150 A  done clear
  B)
  40 V and 300 A done clear
  C)
  40 V and 150 V  done clear
  D)
  V and 300 A done clear
  View Solution play_arrow

• question_answer2)
    Which one of the following features improves the fatigue strength of a metallic material?
  A)
  Increasing the temperature done clear
  B)
  Scratching the surface done clear
  C)
  Overstressing done clear
  D)
  Under stressing done clear
  View Solution play_arrow

• question_answer3)
  Which one of the following pairs is correctly matched?
  A)
  Beauchamp tower first experiments on journal bearings done clear
  B)
  Osborne Reynolds antifriction bearings done clear
  C)
  Sommerfeld number pivot and collar bearings done clear
  D)
  Ball bearings hydrodynamic lubrication done clear
  View Solution play_arrow

• question_answer4)
  Which of the following joining processes are best suited for manufacturing pipes to carry gas products?

  1. Rivetting

  2. Welding

  3. Bolts and nuts

  Select the correct answer using the codes given below:

  Codes:
  A)
  1 and 2             done clear
  B)
  1 and 3 done clear
  C)
  2 alone              done clear
  D)
  1, 2 and 3 done clear
  View Solution play_arrow

• question_answer5)
  The correct sequence of the given materials in ascending order of their Weldability is:
  A)
  MS, copper, cast iron, aluminium done clear
  B)
  Cast iron, MS, aluminium copper done clear
  C)
  Copper, cast iron, MS, aluminium        done clear
  D)
  Aluminium, copper, cast iron, MS done clear
  View Solution play_arrow

• question_answer6)
  A screw thread specified by \[M\,\,20\times 25\,\,C\] as per BIS thread system means:
  A)
  Metric thread of 20 mm nominal diameter and 2.5 mm pitch having coarse tolerance done clear
  B)
  Metric thread of 20 mm root diameter and 2-5 mm pitch having coarse tolerance done clear
  C)
  Metric thread of fine class having 20 mm root diameter and 2.5 mm pitch done clear
  D)
  Metric thread of 20 mm shank diameter and 25 mm thread depth with coarse tolerance. done clear
  View Solution play_arrow

• question_answer7)
  Which one of the following statements is correct?
  A)
  No Flux is used in gas welding of mild steel done clear
  B)
  Borax is the commonly used flux coating on welding electrodes done clear
  C)
  Laser beam welding employs a vacuum chamber and thus avoids use of a shielding method done clear
  D)
  AC can be used for GTAW process done clear
  View Solution play_arrow

• question_answer8)
  Which one of the following statements with regard to belt drives is not correct?
  A)
  Increase in the angle of wrap of the belt enables more power transmission done clear
  B)
  Maximum power is transmitted when the centrifugal tension is three times the tight side tension done clear
  C)
  Wide and thin belt is preferable for better life than a thick and narrow one done clear
  D)
  Crown is provided on the pulley to make the belt run centrally on the pulley done clear
  View Solution play_arrow

• question_answer9)
  Angle of twist of a shaft of diameter d? is inversely proportional to:
  A)
  d                                  done clear
  B)
  \[{{d}^{2}}\] done clear
  C)
  \[{{d}^{3}}\]                           done clear
  D)
  \[{{d}^{4}}\] done clear
  View Solution play_arrow

• question_answer10)
  Which one of the following sets of parameters should be monitored for determining safe operation of journal bearing?
  A)
  Oil pressure, bearing metal temperature and bearing vibration done clear
  B)
  Bearing vibration, oil pressure and speed or shaft done clear
  C)
  Bearing metal temperature oil pressure done clear
  D)
  Oil pressure and bearing vibration. done clear
  View Solution play_arrow

• question_answer11)
  The performance of a hydrodynamic journal bearing is a function of:
  A)
  Reynolds number            done clear
  B)
  Sommerfield number done clear
  C)
  Speed                done clear
  D)
  Bearing modulus done clear
  View Solution play_arrow

• question_answer12)
  Match List-I (Nature of Failure) with List-II (Nature of Member) and select the correct answer using the codes given below the lists:

  List-I (Nature of failure)		List-II (Nature of Member)
  A.	Structural member fails in axial compression	1.	Knuckle Joint
  B.	A member fail along a \[45{}^\circ \] helical plane subjected to torsion	2.	Long column
  C.	A structural member bends and collapses under axial compression load	3.	Strut
  D.	A member fails in double shear for a joint	4.	Cast iron round bar subjected to torsion

  Codes:
  A)
  A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 done clear
  B)
  A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 done clear
  C)
  A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 done clear
  D)
  A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 done clear
  View Solution play_arrow

• question_answer13)
  Which one of the following correctly relates the life of a roller bearing in millions of revolutions (L) the load P and the basic dynamic load rating for 1 million revolutions C?
  A)
  \[L={{(C/P)}^{3}}\]                 done clear
  B)
  \[L={{(C/P)}^{10/3}}\] done clear
  C)
  \[L={{(P/C\,)}^{3}}\]               done clear
  D)
  \[L={{(C/P)}^{1/3}}\] done clear
  View Solution play_arrow

• question_answer14)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I (Type of Thread)		List-II (Use)
  A.	Square thread	1.	Used in vice
  B.	Acme thread	2.	Used in lead screw
  C.	Buttress thread	3.	Used in screw  jack
  D.	Trapezoidal thread	4.	Used in power transmission devices in machine tool

  Codes:
  A)
  A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 done clear
  B)
  A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 done clear
  C)
  A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done clear
  D)
  A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 done clear
  View Solution play_arrow

• question_answer15)
  The number of slots in a 25 mm castle nut are:
  A)
  2                                  done clear
  B)
  4 done clear
  C)
  6                                  done clear
  D)
  8 done clear
  View Solution play_arrow

• question_answer16)
  Which key is preferred for the condition where a large amount of impact torque is to be transmitted in both direction of rotation:
  A)
  Woodruff key     done clear
  B)
  Feather key done clear
  C)
  Gib-head key                  done clear
  D)
  Tangent key done clear
  View Solution play_arrow

• question_answer17)
  Which of the following is true about following specifications: Hex Bolt M 16 NL-IS: 1363:
  A)
  16 eye bolts used on electric motors done clear
  B)
  A stress relieved blot for connecting rod done clear
  C)
  A bolt with a nut done clear
  D)
  A bolt with a nut and a lock nut done clear
  View Solution play_arrow

• question_answer18)
  Which bearing is preferred for oscillating conditions?
  A)
  Double row roller hearing done clear
  B)
  Angular contact single row ball bearing done clear
  C)
  Taper roller bearing done clear
  D)
  Needle roller hearing done clear
  View Solution play_arrow

• question_answer19)
  Ball bearings are provided with a cage:
  A)
  To reduce friction done clear
  B)
  To maintain the halls at a fixed distance apart done clear
  C)
  To prevent the lubricant from flowing out done clear
  D)
  To facilitate slipping of balls. done clear
  View Solution play_arrow

• question_answer20)
  Thick steel plate cut with oxygen normally shows signs of cracking. This tendency for cracking can be minimized by:
  A)
  Slow speed cutting done clear
  B)
  Cutting in two or more stages done clear
  C)
  Preheating the plate done clear
  D)
  Using oxy-acetylene flame done clear
  View Solution play_arrow

• question_answer21)
  Jewel bearings are used in:
  A)
  Contaminated atmosphere done clear
  B)
  low-torque applications done clear
  C)
  Fully immersed in water condition done clear
  D)
  High speed shafts done clear
  View Solution play_arrow

• question_answer22)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I (Type of joint)		List-II (Mode of joining members)
  A.	Cotter joint	1.	Connects two rods or bars permitting small amount of flexibility
  B.	Knuckle joint	2.	Rigidly connects two members
  C.	Turn buckle	3.	Connects two rods having threaded ends
  D.	Riveted joint	4.	Permanent fluid-tight joint between two plates.
  		5.	Connects two shafts and transmits torque

  Codes:
  A)
  A\[\to \]5, B\[\to \]1, C\[\to \]3, D\[\to \]2 done clear
  B)
  A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 done clear
  C)
  A\[\to \]5, B\[\to \]3, C\[\to \]2, D\[\to \]4 done clear
  D)
  A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 done clear
  View Solution play_arrow

• question_answer23)
  The most efficient riveted joint possible is one which would be as strong in tension, shear and bearing as the original plates to be joined. But this can never be achieved because:
  A)
  Rivets cannot be made with the same material done clear
  B)
  Rivets are weak in compression done clear
  C)
  There should be at least one hole in the plate reducing its strength done clear
  D)
  Clearance is present between the plate and the rivet done clear
  View Solution play_arrow

• question_answer24)
  Which of the following stresses are associated with the tightening of a nut on a stud?
  A)
  Tensile stresses due to stretching of stud. done clear
  B)
  Bending stresses of stud. done clear
  C)
  Transverse shear stresses across threads. done clear
  D)
  Torsional shear stresses in threads due to frictional resistance done clear
  View Solution play_arrow

• question_answer25)
  The frictional torque for square thread at mean radius while raising load is given by \[(W=load,\,{{R}_{0}}\,=\,\]Mean Radius,\[\phi =\]Angle of friction, \[\alpha \,=\,\]Helix angle):
  A)
  \[W{{R}_{0}}\tan (\phi -\alpha )\]            done clear
  B)
  \[W{{R}_{0}}\tan (\phi +\alpha )\] done clear
  C)
  \[W{{R}_{0}}\tan \alpha \]                     done clear
  D)
  \[W{{R}_{0}}\tan \phi \] done clear
  View Solution play_arrow

• question_answer26)
  In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to:
  A)
  Increase the key length  done clear
  B)
  Increase the key depth done clear
  C)
  Increase the key width done clear
  D)
  Decrease the key length done clear
  View Solution play_arrow

• question_answer27)
  Consider the following statements:

  1. Grinding

  2. Coating

  3. Hammer peening

  For improving the fatigue strength of steel. Of the above statements:
  A)
  1 and 2 are correct          done clear
  B)
  2 and 3 are correct done clear
  C)
  1 and 3 are correct          done clear
  D)
  1, 2 and 3 are correct. done clear
  View Solution play_arrow

• question_answer28)
  The following data refers to an open belt drive:

  	Pulley A	Pulley B
  Purpose?.	Driving	Driving
  Diameter?.	450  mm	750 mm
  Angle of contact?.	\[{{\theta }_{A}}\,=\,150\]	\[{{\theta }_{B}}\,=\,210{}^\circ \]
  Coefficient of friction between belt and pulley	\[{{f}_{A}}\,=\,0.36\]	\[{{f}_{B}}\,=\,0.22\]

  The ratio of tensions may be calculated using the Relation \[({{T}_{1}}/{{T}_{2}})\,=\]exp (z) where z is:
  A)
  \[{{f}_{A}}{{\theta }_{A}}\]                             done clear
  B)
  \[{{f}_{B}}{{\theta }_{B}}\] done clear
  C)
  \[({{f}_{A}}+{{f}_{B}})\,({{\theta }_{A}}+{{\theta }_{B}})/4\]            done clear
  D)
  \[({{f}_{A}}{{\theta }_{A}}+{{f}_{B}}{{\theta }_{B}})/2\] done clear
  View Solution play_arrow

• question_answer29)
  In a multiple V-belt drive, when angle belt is damaged, it is preferable to change the complete set to:
  A)
  Reduce vibration done clear
  B)
  Reduce slip done clear
  C)
  Ensure uniform loading done clear
  D)
  Ensure proper alignment done clear
  View Solution play_arrow

• question_answer30)
  Design of shafts made of brittle material is based on:
  A)
  Guest's theory     done clear
  B)
  Rankine's theory done clear
  C)
  St. Venant's theory          done clear
  D)
  Von-Mises theory. done clear
  View Solution play_arrow

• question_answer31)
  A motor car has wheel base of 280 cm and the pivot distance of front stub axles is 140 cm. When the outer wheel has turned through 30, the angle of turn of the inner front wheel for correct steering will be:
  A)
  \[60{}^\circ \]                           done clear
  B)
  \[{{\cot }^{-1}}2.23\] done clear
  C)
  \[{{\cot }^{-1}}1.232\]             done clear
  D)
  \[30{}^\circ \] done clear
  View Solution play_arrow

• question_answer32)
  Match List-I with List-II and select answer using the codes given below the Lists:

  List-I (Types of joints)		List-II (An element of the joint)
  A.	Riveted joint	1.	Pin
  B.	Welded joint	2.	Strap
  C.	Bolted joint	3.	Lock washer
  D.	Knuckle joint	4.	Fillet

  Codes:
  A)
  A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 done clear
  B)
  A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 done clear
  C)
  A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 done clear
  D)
  A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 done clear
  View Solution play_arrow

• question_answer33)
  Consider the following statements regarding power screws:                                    

  1. The efficiency of a self-locking screw cannot be more than 50%

  2. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

  3. The efficiency of ACME (trapezoidal) thread is less than that of square thread.

  Of these statements:                            
  A)
  1, 2 and 3-are correct      done clear
  B)
  2 and 3 are correct  done clear
  C)
  1 and 3 are correct                      done clear
  D)
  1 and 2 are correct done clear
  View Solution play_arrow

• question_answer34)
     Electron beam welding can be carried out in:     
  A)
  Open air            done clear
  B)
  A shielding gas environment                 done clear
  C)
  A pressurized inert gas chamber             done clear
  D)
  Vacuum done clear
  View Solution play_arrow

• question_answer35)
                                  Given that \[p\,=\] chain pitch                      C = Centre distance                            N, n = number of teeth on large and small sprocket respectively,                                 The length of chain in terms of pitches can be approximated by:                             
  A)
  \[\frac{2C}{P}\] done clear
  B)
  \[\frac{2C}{P}+(N+n)/2\] done clear
  C)
  \[\frac{2C}{P}+\left[ \frac{N+n}{2\pi } \right]\frac{p}{C}\] done clear
  D)
  \[\frac{2C}{P}+\frac{N+n}{2p}{{\left[ \frac{N-n}{2p} \right]}^{2}}\,\frac{p}{C}\] done clear
  View Solution play_arrow

• question_answer36)
  When compared to a rod of the same diameter and material, a wire rope:                        
  A)
  Is less flexible                                done clear
  B)
  Has a much smaller load carrying capacity    done clear
  C)
  Does not provide much warning before failure done clear
  D)
  Provides much greater time for remedial action before failure done clear
  View Solution play_arrow

• question_answer37)
                                 A shafts subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m add 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is:     
  A)
  2000-N-m                      done clear
  B)
  2050 N-m done clear
  C)
  2100 N-m                      done clear
  D)
  2136 N-m done clear
  View Solution play_arrow

• question_answer38)
  The lead angle of a worm is \[22.5{}^\circ .\] Its helix angle will be:                                            
  A)
  \[22.5{}^\circ \]            done clear
  B)
  \[45{}^\circ \]                done clear
  C)
  \[67.5{}^\circ \]            done clear
  D)
  \[90{}^\circ \]  done clear
  View Solution play_arrow

• question_answer39)
                Consider the following statements about anti- friction bearings:                                   

  1. They have low starting and low running friction at moderate speeds

  2. They have high resistance to shock loading.

  3. They can carry both radial and thrust loads.

  4. Their initial cost is high.

  5. They can accommodated some amount of misalignment of shaft.

  Of these statements:
  A)
  1, 2, 3 and 4                  done clear
  B)
  1, 3 and 4 are correct done clear
  C)
  1, 4 and 5 are correct      done clear
  D)
  1, 2, 3 and 5 are correct done clear
  View Solution play_arrow

• question_answer40)
  The load cup of a screw jack is made separate from the head of the spindle to:
  A)
  Enhance the load carrying capacity of the jack done clear
  B)
  Reduce the effort needed for lifting the working load done clear
  C)
  Reduce the value of frictional torque to be countered for lifting the load done clear
  D)
  Prevent the rotation of load being lifted done clear
  View Solution play_arrow

• question_answer41)
  A bolt of uniform strength can be developed by:
  A)
  Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt. done clear
  B)
  Keeping the core diameter smaller than the diameter of the unthreaded portion. done clear
  C)
  Keeping the nominal diameter of threads equal the diameter of unthreaded portion of the bolt. done clear
  D)
  One end fixed and the other end free. done clear
  View Solution play_arrow

• question_answer42)
  Which designing a screw is a screw jack against buckling failure, the end conditions for the screw are taken as:
  A)
  Both the ends fixed done clear
  B)
  Both the ends hinged done clear
  C)
  One end fixed and other end hinged done clear
  D)
  One end fixed and there end free done clear
  View Solution play_arrow

• question_answer43)
  Match List-I with List-II and select the correct answer using the codes given below the list:

  List-I (Different types of detachable joints)		List-II (Specific use of these detachable joints)
  A.	Cotter joint	1.	Tie rod of a wall crane
  B.	Knuckle joint	2.	Suspension bridges
  C.	Suspension link joint	3.	Diagonal stays in boiler
  D.	Turn buckle (adjustable joint)	4.	Cross-head a steam engine

  Codes:
  A)
  A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 done clear
  B)
  A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 done clear
  C)
  A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done clear
  D)
  A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 done clear
  View Solution play_arrow

• question_answer44)
  A spur gear transmitting power is connected to the shaft with a key of rectangular section. The type (s) of stresses developed in the key is/are:
  A)
  Shear stress alone done clear
  B)
  Hearing stress alone done clear
  C)
  Both shear and bearing stresses done clear
  D)
  Shearing, bearing and bending stresses. done clear
  View Solution play_arrow

• question_answer45)
  The permissible stress in a filled weld is 100 N/mm. The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on weldment per cm length of the weld is:
  A)
  225 kN              done clear
  B)
  15.0 kN done clear
  C)
  10.6 kN             done clear
  D)
  7.5 kN done clear
  View Solution play_arrow

• question_answer46)
  Sources of power loss in a chain drive are given below:

  1. Friction between chain and sprocket teeth.

  2. Overcoming the chain stiffness.

  3. Overcoming the friction in shaft bearing.

  4. Frictional resistance of the motion of the chain in air or lubricant.

  The correct sequence of descending order of power loss due to these sources is:
  A)
  1, 2, 3, 4                       done clear
  B)
  1, 2, 4, 3 done clear
  C)
  2, 1, 3, 4                       done clear
  D)
  2, 1, 4, 3 done clear
  View Solution play_arrow

• question_answer47)
  Consider the following design considerations:

  1.  Tensile failure

  2.  Creep failure

  3.  Bearing failure

  4.  Shearing failure

  5.  Bending failure

  The design of the pin of a rocker arm of an I.C. engine is based on:
  A)
  1, 2 and 4                      done clear
  B)
  1, 3 and 4 done clear
  C)
  2, 3 and 5                      done clear
  D)
  3, 4 and 5 done clear
  View Solution play_arrow

• question_answer48)
  Which one of the following loadings is considered for design of axles?
  A)
  Bending moment only done clear
  B)
  Twisting moment only done clear
  C)
  Combined bending moment and torsion done clear
  D)
  Combined action of bending moment, twisting moment and axial thrust. done clear
  View Solution play_arrow

• question_answer49)
  Removal of metal particles from the raceway of a roiling contact bearing is a kind of failure of bearing known as:
  A)
  Pitting               done clear
  B)
  Wearing done clear
  C)
  Spilling              done clear
  D)
  Scuffing done clear
  View Solution play_arrow

• question_answer50)
  The design calculations of members subject to fluctuating loads with the same factor of safety yield the most conservative estimates when using:
  A)
  Gerber relation                done clear
  B)
  Soderberg relation done clear
  C)
  Goodman relation                       done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer51)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I		List-II
  A.	Crank shaft	1.	Supports the revolving part and transmits torque.
  B.	Wire shaft	2.	Transmits motion between shafts where is not possible to effect rigid coupling between them.
  C.	Axle	3.	Converts linear motion into rotary motion.
  D.	Plain shaft	4.	Supports only the revolving parts.

  Codes:
  A)
  A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done clear
  B)
  A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 done clear
  C)
  A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 done clear
  D)
  A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 done clear
  View Solution play_arrow

• question_answer52)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I (Terminology)		List-II (Relevant term)
  A.	Interference	1.	Arc of approach, arc of recess, circular pitch.
  B.	Dynamic load on tooth	2.	Lewis equation.
  C.	Static load	3.	Minimum number of teeth on pinion.
  D.	Contact ratio	4.	Inaccuracies in tooth profile

  Codes:
  A)
  A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 done clear
  B)
  A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 done clear
  C)
  A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 done clear
  D)
  A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 done clear
  View Solution play_arrow

• question_answer53)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I (Name)		List-II (Type)
  A.	Oldham coupling	1.	Joins collinear shafts and is rigid type.
  B.	Flange coupling	2.	Joins non-collinear shafts and is adjustable.
  C.	Universal coupling	3.	Joins collinear shafts and engages and disengages them during motion.
  D.	Friction coupling	4.	Compensates peripheral shafts, longitudinal and angular shifts of shafts.

  Codes:
  A)
  A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 done clear
  B)
  A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done clear
  C)
  A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 done clear
  D)
  A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 done clear
  View Solution play_arrow

• question_answer54)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I (Requirement)		List-II (Type)
  A.	High temperature service.	1.	Teflon bearing
  B.	High load	2.	Carbon bearing
  C.	No lubrication	3.	Hydrodynamic bearing
  D.	Bushings	4.	Sleeve bearing

  Codes:
  A)
  A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 done clear
  B)
  A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 done clear
  C)
  A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 done clear
  D)
  A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 done clear
  View Solution play_arrow

• question_answer55)
  In the calculation of induced shear stress in helical springs, the Wahl's correction factor is used to take care of:
  A)
  Combined effect of transverse shear stress and bending stress in the wire. done clear
  B)
  Combined effect of bending stress and curvature of the wire. done clear
  C)
  Combined effect of transverse shear stress and curvature of the wire. done clear
  D)
  Combined effect of torsional shear stress an transverse shear stress in the wire done clear
  View Solution play_arrow

• question_answer56)
  Two rigid plates are clamped by means of bolt and nut with an initial force N. After tightening, separating force P (P<N) is applied to the Lower plate, which in turn ads on nut. The tension in the bolt after this is:
  A)
  (N+P)               done clear
  B)
  \[\left( N-P \right)\] done clear
  C)
  P                                  done clear
  D)
  N done clear
  View Solution play_arrow

• question_answer57)
  To ensure self-locking in a screw jack it is essential that helix angle is:
  A)
  Larger than friction angle done clear
  B)
  Smaller than friction angle done clear
  C)
  Equal to friction angle done clear
  D)
  Such as to give maximum efficiency in lifting done clear
  View Solution play_arrow

• question_answer58)
  A double fillet welded joint with parallel fillet weld of length L and leg B is subjected to a tensile force P. Assuming uniform stress distribution, the shear stress in distribution, the shear stress the weld is given by:
  A)
  \[\frac{\sqrt{2.}\,P}{BL}\]                      done clear
  B)
  \[{{\sigma }_{1}}=\frac{P}{2hl}\] done clear
  C)
  \[\frac{P}{\sqrt{2.}B.L}\]                       done clear
  D)
  \[\frac{2P}{B.L}\] done clear
  View Solution play_arrow

• question_answer59)
  In flat belt drive, if the slip between the driver and the belt is 1%, that between belt and follower is 3% and driver and follower pulley diameters are equal, then the velocity ratio of the drive will be:
  A)
  0.99                              done clear
  B)
  0.98 done clear
  C)
  0 0.97               done clear
  D)
  0.96 done clear
  View Solution play_arrow

• question_answer60)
  Effective stress in wire ropes during normal working is equal to the stress due to:
  A)
  Axial load plus stress due to bending done clear
  B)
  acceleration/retardation of masses plus stress due to bending done clear
  C)
  Axial load plus stress due to acceleration/ retardation done clear
  D)
  bending plus stress due to acceleration/retardation done clear
  View Solution play_arrow

• question_answer61)
  A transmission shaft subjected to bending loads must be designed on the basis of:
  A)
  Maximum normal stress theory done clear
  B)
  Maximum shear stress theory done clear
  C)
  Maximum normal stress and maximum shear stress theories done clear
  D)
  Fatigue strength done clear
  View Solution play_arrow

• question_answer62)
    Consider the following statements:

  The form factor of a spur gear tooth depends upon the

  1. Number of teeth

  2. Pressure angle.

  3. Addendum modification.

  4. Circular pitch.

  Of these statements:
  A)
  1 and 3 are correct done clear
  B)
  1 and 4 are correct done clear
  C)
  1, 2 and 3 are correct      done clear
  D)
  1 and 4 are correct done clear
  View Solution play_arrow

• question_answer63)
  When belt drive is transmitting maximum power:
  A)
  Effective tension is equal to centrifugal tension done clear
  B)
  Effective tension is half of centrifugal tension done clear
  C)
  Driving tension on slack side is equal to the centrifugal tension done clear
  D)
  Driving tension on tight side is twice the centrifugal tension done clear
  View Solution play_arrow

• question_answer64)
  Tapered roller bearing can take:
  A)
  Radial load only done clear
  B)
  Axial load only done clear
  C)
  Both radial and axial loads and the ratio of these being less than unity done clear
  D)
  Both radial and axial loads and the ratio of these being greater than unity done clear
  View Solution play_arrow

• question_answer65)
  In bearing characteristic number in a hydrodynamic bearing depends on:
  A)
  It is closer to real life situation done clear
  B)
  It leads to a safer design done clear
  C)
  It leads to cost effective design done clear
  D)
  No other assumption is possible done clear
  View Solution play_arrow

• question_answer66)
  The bearing characteristic number in a hydrodynamic bearing depends on:
  A)
  Length, width and load done clear
  B)
  Length, width and speed done clear
  C)
  Viscosity, speed and load done clear
  D)
  Viscosity, speed and bearing pressure done clear
  View Solution play_arrow

• question_answer67)
  Which one of the following welding processes uses non-consumable electrodes?
  A)
  TIG welding                   done clear
  B)
  MIG welding done clear
  C)
  Manual arc welding         done clear
  D)
  Submerged arc welding done clear
  View Solution play_arrow

• question_answer68)
  Match List-I with List-II and Select the correct answer using the codes given below the Lists:

  List-I (Filler)		List-II (Joining process)
  A.	Cu, Zn, Ag, alloy	1.	Braze welding
  B.	Cu, Sn alloy	2.	Brazing
  C.	Pb, Sb alloy	3.	Soldering
  D.	Iron oxide and aluminium powder	4.	TIG welding of aluminium.

  Codes:
  A)
  A\[\to \]1, B\[\to \]1, C\[\to \]1, D\[\to \]3 done clear
  B)
  A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]4 done clear
  C)
  A\[\to \]2, B\[\to \]1, C\[\to \]2, D\[\to \]3 done clear
  D)
  A\[\to \]2, B\[\to \]4, C\[\to \]2, D\[\to \]3 done clear
  View Solution play_arrow

• question_answer69)
  The maximum efficiency of a self-locking screw is:
  A)
  50%                              done clear
  B)
  70% done clear
  C)
  75%                              done clear
  D)
  80% done clear
  View Solution play_arrow

• question_answer70)
  Match List-I (Type of keys) with List-II (Characteristic) and select the correct answer using the codes given below the Lists:

  List-I		List-II
  A.	Woodruff key	1.	Loose fitting, light duty
  B.	Kennedy key	2.	Heavy duty
  C.	Feather key	3.	Self-aligning
  D.	Flat key	4.	Normal industrial use

  Codes:
  A)
  A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 done clear
  B)
  A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done clear
  C)
  A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 done clear
  D)
  A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 done clear
  View Solution play_arrow

• question_answer71)
  Consider the following statements:

  MIG welding process uses

  1. Consumable electrode

  2. Non-consumable electrode

  3. D. C power supply

  4. A. C power supply.

  Of these statements:
  A)
  2 and 4 are correct          done clear
  B)
  2 and 3 arc correct done clear
  C)
  1 and 4 are correct          done clear
  D)
  1 and 3 are correct done clear
  View Solution play_arrow

• question_answer72)
  In the case of a vertical belt pulley drive with \[{{T}_{C}}\] as centrifugal tension and \[{{T}_{0}}\] as the initial tension, the belt would tend to hang clear of the lower pulley when:
  A)
  \[{{T}_{c}}\]<\[{{T}_{0}}\]                  done clear
  B)
  \[{{T}_{c}}\,=\,{{T}_{0}}/3\] done clear
  C)
  \[{{T}_{c}}\]>\[{{T}_{0}}\]                  done clear
  D)
  \[{{T}_{c}}\,=\,{{T}_{0}}/2\] done clear
  View Solution play_arrow

• question_answer73)
  Given that \[{{T}_{1}}\] and \[{{T}_{2}}\] are the tensions on the tight and slack of the belt respectively, the initial tension of the belt taking centrifugal tension \[{{T}_{c}}\] is equal to:
  A)
  \[\frac{{{T}_{1}}+{{T}_{2}}+{{T}_{c}}}{3}\]                        done clear
  B)
  \[\frac{{{T}_{1}}+{{T}_{2}}+2{{T}_{c}}}{2}\] done clear
  C)
  \[\frac{{{T}_{1}}+{{T}_{2}}+3{{T}_{c}}}{2}\]                      done clear
  D)
  \[\frac{{{T}_{1}}+{{T}_{2}}+4{{T}_{c}}}{3}\] done clear
  View Solution play_arrow

• question_answer74)
  Given that W = weight of load handled, W = weight of rope, and \[f=\] acceleration, the additional load in ropes of a hoist during starting is given by:
  A)
  \[{{F}_{a}}=\left( \frac{W-{{W}_{r}}}{g} \right)f\]         done clear
  B)
  \[{{F}_{a}}=\left( \frac{W+{{W}_{r}}}{g} \right)f\] done clear
  C)
  \[{{F}_{a}}=\left( \frac{W}{g} \right)f\]               done clear
  D)
  \[{{F}_{a}}=\left( \frac{{{W}_{r}}}{g} \right)f\] done clear
  View Solution play_arrow

• question_answer75)
  When a shaft transmits power through gears, the shaft experiences:
  A)
  Torsional stresses alone done clear
  B)
  Bending stresses alone done clear
  C)
  Constant bending and varying torsional stresses done clear
  D)
  Varying bending and constant torsional stresses done clear
  View Solution play_arrow

• question_answer76)
  The limiting wear load of spur gear is proportional to (where \[{{E}_{p}}\,\,=\] Young's modulus of union material; \[{{E}_{g}}\,\,=\] Young's modulus of gear material:
  A)
  \[{{({{E}_{p}}+{{E}_{g}})}^{-1}}\]               done clear
  B)
  \[\left( \frac{{{E}_{p}}+{{E}_{s}}}{{{E}_{p}}{{E}_{s}}} \right)\] done clear
  C)
  \[\left( 1+\frac{{{E}_{p}}}{{{E}_{s}}} \right)\]               done clear
  D)
  \[\left( 1+\frac{{{E}_{g}}}{{{E}_{B}}} \right)\] done clear
  View Solution play_arrow

• question_answer77)
  Which one of the following statements is not true of rolling contact bearing?
  A)
  The bearing characteristic number is given by \[\frac{ZN}{p}\] where Z is the absolute viscosity of the lubricant, Nis the shaft speed and p is the bearing pressure. done clear
  B)
  Inner race of a radial ball bearing has an interference fit with the shaft and rotates along with it. done clear
  C)
  Outer race of the hearing has in interference fit with bearing housing and does not rotate. done clear
  D)
  In some cases, the inner race is stationary and outer race rotates. done clear
  View Solution play_arrow

• question_answer78)
  In the multiple disc clutch, if there are 6 discs on the driving shaft and 5 discs on the driven shaft, then the number of pairs of contact surfaces will be equal to:
  A)
  11                                 done clear
  B)
  12                 done clear
  C)
  10                                 done clear
  D)
  22     done clear
  View Solution play_arrow

• question_answer79)
              Match List-I with List-II and select the correct answer using the codes given below the lists:  

  List-I (Bearing materials)		List-II (Properties)
  A.	Babbits	1.	Porous
  B.	Bronze	2.	Good emeddability
  C.	C.I.	3.	Suitable for high Loads and low speeds
  D.	Sintered powdered metal	4	Run well with C.I. journals

  Codes:
  A)
  A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 done clear
  B)
  A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done clear
  C)
  A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 done clear
  D)
  A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 done clear
  View Solution play_arrow

• question_answer80)
  Wahl stress factor takes into account:            
  A)
  Direct shear stress.                           done clear
  B)
  Torsional shear stress                         done clear
  C)
  Wire curvature effect                          done clear
  D)
  Direct shear and wire curvature effect.   done clear
  View Solution play_arrow

• question_answer81)
        Which of the following stresses are associated with the tightening of nut on a bolt?                 

  (1) Tensile stress due to the stretching of bolt

  (2) Bending stress due to the bending of bolt

  (3) Crushing and shear stresses in threads

  (4) Torsional shear stress due to frictional resistance between the nut and the bolt.

  Select the correct answer using the codes given below:
  A)
  1, 2 and 4                      done clear
  B)
  1, 2 and 3          done clear
  C)
  2, 3 and 4                      done clear
  D)
  1, 3 and 4 done clear
  View Solution play_arrow

• question_answer82)
            The shearing area of a key of length 'L' breadth 'b' depth 'h' is equal to:                           
  A)
  \[b\times h\]                   done clear
  B)
  \[L\times h\] done clear
  C)
  \[L\times b\]                   done clear
  D)
  \[L\times (h/2)\] done clear
  View Solution play_arrow

• question_answer83)
  Match List-I (Machine element) with List-II (Cause of failure) and select the correct answer using the codes given below the lists:

  List-I		List-II
  A.	Axle	1.	Shear stress
  B.	Cotter	2.	Tensile/Compressive stress
  C.	Connecting rod	3.	Wear
  D.	Journal bearing	4	Bending stress

  Codes:
  A)
  A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 done clear
  B)
  A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 done clear
  C)
  A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]2 done clear
  D)
  A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 done clear
  View Solution play_arrow

• question_answer84)
  In oxy-acetylene gas welding, for complete combustion, the volume of oxygen required per unit of acetylene is:
  A)
  1                                  done clear
  B)
  1.5 done clear
  C)
  2                                  done clear
  D)
  2.5 done clear
  View Solution play_arrow

• question_answer85)
  Consider the following statements. A splined shaft is used for

  1. Transmitting power

  2. Holding a flywheel rigidly in position

  3. Moving axially the gear wheels mounted on it

  4. Mounting V-belt pulleys on it.

  Of these statements:
  A)
  2 and 3 are correct          done clear
  B)
  1 and 4 are correct done clear
  C)
  2 and 4 are correct          done clear
  D)
  1 and 3 are correct done clear
  View Solution play_arrow

• question_answer86)
  When two shafts are neither parallel nor intersecting, power can be transmitted by using:
  A)
  A pair of spur gears done clear
  B)
  A pair of helical gears done clear
  C)
  An Oldham's coupling done clear
  D)
  A pair of spiral gears. done clear
  View Solution play_arrow

• question_answer87)
  In the assembly design of shaft, pulley and key, the weakest members is:
  A)
  Pulley                done clear
  B)
  Key done clear
  C)
  Shaft                             done clear
  D)
  None done clear
  View Solution play_arrow

• question_answer88)
  In the formulation of Lewis equation for toothed gearing, it is assumed that tangential tooth load \[{{F}_{1}}\]act on the:
  A)
  Pitch point done clear
  B)
  Tip of the tooth done clear
  C)
  Root of the tooth done clear
  D)
  Whole face of the tooth done clear
  View Solution play_arrow

• question_answer89)
  For a two-dimensional state \[({{\sigma }_{1}},\,{{\sigma }_{2}},\,{{\sigma }_{1}}\]>\[0,\,{{\sigma }_{2}}\]<0) he designed values are most conservative if which one of the following failure theories were used?
  A)
  Maximum principal strain theory done clear
  B)
  Maximum distortion energy theory done clear
  C)
  Maximum shear stress theory done clear
  D)
  Maximum principal stress theory done clear
  View Solution play_arrow

• question_answer90)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I		List-II
  A.	Single-plate friction clutch	1.	Scooters clutch
  B.	Multi-plate friction clutch	2.	Rolling mills
  C.	Centrifugal clutch	3.	Trucks
  D.	Jaw clutch	4.	Mopeds

  Codes:
  A)
  A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]2 done clear
  B)
  A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 done clear
  C)
  A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 done clear
  D)
  A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 done clear
  View Solution play_arrow

• question_answer91)
  Which of the following stresses are associated with the design of pins in hushed pin-type, flexible coupling?

  1. Bearing stress

  2. Bending stress

  3. Axial tensile stress

  4. Transverse shear stress

  Select the correct answer using the codes given below:
  A)
  1, 3 and 4                      done clear
  B)
  2, 3 and 4 done clear
  C)
  1, 2 and 3                      done clear
  D)
  1, 2 and 4 done clear
  View Solution play_arrow

• question_answer92)
  The diameter of tommy bar for a screw jack is designed for:
  A)
  Bending moment due to effort applied done clear
  B)
  Torque on the tommy bar due to effort applied done clear
  C)
  A percentage of axial loads done clear
  D)
  Some axial loads coupled with transverse loads done clear
  View Solution play_arrow

• question_answer93)
  Centrifugal tension in belts is:
  A)
  Useful because it maintains some tension even when no power is transmitted               done clear
  B)
  Not harmful because it does not take part in power transmission done clear
  C)
  Harmful because it increases belt tension and reduces the power transmitted done clear
  D)
  A hypothetical phenomenon and does not actually exist in belts done clear
  View Solution play_arrow

• question_answer94)
  In a single reduction, a large velocity ratio is required. The best transmission is:
  A)
  Spur gear drive done clear
  B)
  Helical gear drive done clear
  C)
  Bevel gear drive done clear
  D)
  Worm gear drive done clear
  View Solution play_arrow

• question_answer95)
  Which one of the following belts should not he used above\[40{}^\circ C\]?
  A)
  Balata belt                     done clear
  B)
  rubber belt done clear
  C)
  Fabric belt                      done clear
  D)
  synthetic belt done clear
  View Solution play_arrow

• question_answer96)
  Consider the following statements:

  A nomenclature \[\phi \]50H8/p8 denoted that

  1. Hole diameter is 50 mm

  2. It is a shaft base system

  3. 8 indicates fundamental deviation.

  Which of the statements given above is/are correct?
  A)
  1, 2 and 3                      done clear
  B)
  1 and 2 only done clear
  C)
  1 and 3 only                  done clear
  D)
  3 only done clear
  View Solution play_arrow

• question_answer97)
  A certain minimum number of teeth is to be kept for a gear wheel:
  A)
  So that the gear is of a good size done clear
  B)
  For better durability done clear
  C)
  To avoid interference and undercutting done clear
  D)
  For better strength done clear
  View Solution play_arrow

• question_answer98)
  In a single row deep groove ball-bearing, cages are needed to:
  A)
  Separate the two races done clear
  B)
  Separate the balls from the inner race done clear
  C)
  Separate the outer race from the balls done clear
  D)
  Ensure that the balls do into cluster at one point and maintain proper relative angular positions. done clear
  View Solution play_arrow

• question_answer99)
  Which one of the following types of bearings is employed in shafts of gearboxes of automobiles?
  A)
  Hydrodynamic journal bearings done clear
  B)
  Multi-lobed journal hearings done clear
  C)
  Antifriction bearings done clear
  D)
  Hybrid journal bearings. done clear
  View Solution play_arrow

• question_answer100)
  A hole is to be punched in a 15 mm thick plate having an ultimate shear strength of  3 N-\[m{{m}^{-2}}.\]If the allowable crushing stress in the punch is \[6\,N\]-\[m{{m}^{-2}},\] the diameter of the smallest hole which can be punched is equal to:
  A)
  15 mm              done clear
  B)
  30 mm done clear
  C)
  60 mm              done clear
  D)
  120 mm done clear
  View Solution play_arrow

• question_answer101)
  The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is:
  A)
  Less than 0.1 percent done clear
  B)
  Less than 0.3 percent done clear
  C)
  More than 0.3 percent done clear
  D)
  Anywhere between 0.1 to 1.0 percent done clear
  View Solution play_arrow

• question_answer102)
  The safe rim velocity of a flywheel is influenced by the
  A)
  Centrifugal stresses  done clear
  B)
  Fluctuation of energy done clear
  C)
  Fluctuation of speed done clear
  D)
  Mass of the flywheel done clear
  View Solution play_arrow

• question_answer103)
  Match List-I (Bearings) with List-II (Applications) and select the correct answer using the codes given below the lists:

  List-I		List-II
  A.	Journal hearing	1.	Electric motors
  B.	Thrust bearing	2.	Watches
  C.	Conical pivot bearing	3.	Marine engines
  D.	Ball bearing	4.	Swivelling chairs

  Codes:
  A)
  A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 done clear
  B)
  A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 done clear
  C)
  A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 done clear
  D)
  A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 done clear
  View Solution play_arrow

• question_answer104)
  Weld spatter occurs due to any of the following except:
  A)
  High welding current done clear
  B)
  Too small an electrode done clear
  C)
  Are done clear
  D)
  Wrong polarity done clear
  View Solution play_arrow

• question_answer105)
  In a hydrodynamic journal bearing, there is:
  A)
  A very thin film of lubricant between the journal and the hearing such that there is contact between the journal and the bearing done clear
  B)
  A thick film of lubricant between the journal and the bearing                                   done clear
  C)
  No lubricant between the journal and the bearing done clear
  D)
  A forced lubricant between the journal and the bearing done clear
  View Solution play_arrow

• question_answer106)
  Consider the following statements:

  1. From design considerations, it is always advantageous to place cast iron ribs on the tension side rather than on the compression side.

  2. Cast iron is an excellent choice for machine tool guides and frames

  3. Cast iron parts have a low notch sensitivity.

  Which of these statements are correct?
  A)
  1, 2 and 3                      done clear
  B)
  2 and 3 done clear
  C)
  1 and 3             done clear
  D)
  1 and 2 done clear
  View Solution play_arrow

• question_answer107)
  Match List-I (Applications) with List-II (Choice of bearings) and select the correct answer using the codes given below the lists:

  List-I (Application)		List-II (Choice of Bearings)
  A.	Granite table of a coordinate measuring machine	1.	Hydrodynamic bearing
  B.	Headstock spindle of a lathe	2.	Deep groove ball bearing
  C.	Crank shaft of a lathe	3.	hydrostatic bearing diesel engine
  D.	Armature of 0.5 kW induction motor	4.	Taper roller bearing

  Codes:
  A)
  A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 done clear
  B)
  A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done clear
  C)
  A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 done clear
  D)
  A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 done clear
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• question_answer108)
  If k = 3 for hail bearings and k = 3.33 for roller bearings, which one of the following correctly states the load (P) - Life (L) relationship for rolling contact bearings? 
  A)
  \[\frac{{{L}_{1}}}{{{L}_{2}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{k}}\]                        done clear
  B)
  \[\frac{{{L}_{1}}}{{{L}_{2}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{\frac{1}{(k-1)}}}\] done clear
  C)
  \[\frac{{{L}_{2}}}{{{L}_{1}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{k}}\]                        done clear
  D)
  \[\frac{{{L}_{2}}}{{{L}_{1}}}\,=\,{{\left( \frac{{{p}_{1}}}{{{p}_{2}}} \right)}^{k-1}}\]    done clear
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• question_answer109)
                           Consider the following statements regarding boundary lubrication conditions in hydrodynamic journal hearings:

  1. It is an undesirable condition.

  2. It always occurs during starting and stopping of the journal.

  3. It necessitates frequent repair of the journal.

  4. This condition can he completely eliminated by using high viscosity lubricant.

  Which of the statements given above are correct?
  A)
  1, 2 and 4                      done clear
  B)
  2, 3 and 4 done clear
  C)
  1 and 2             done clear
  D)
  3 and 4       done clear
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• question_answer110)
         When the lubricating oil is forced between the journal and bearing by external pressure, the bearing is known as:
  A)
  Zero film bearing                         done clear
  B)
  Boundary lubricated bearing done clear
  C)
  Hydrostatic bearing                            done clear
  D)
  Hydrodynamic bearing          done clear
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• question_answer111)
            Intensity of radiation at a surface in perpendicular direction is equal to:
  A)
  Product of emissivity of surface and \[1/\pi .\] done clear
  B)
  Product of emissivity of surface and \[\pi .\] done clear
  C)
  Product of emissive power of surface and \[1/\pi .\] done clear
  D)
  Product of emissive power of surface and \[\pi .\] done clear
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• question_answer112)
  In a mass transfer process of diffusion of hot smoke in cold air in a power plant, the temperature profile and the concentration profile will become identical when:
  A)
  Prandtl No. = 1  done clear
  B)
  Nusselt No. = 1 done clear
  C)
  Lewis No. = 1    done clear
  D)
  Schemidt No. = 1 done clear
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• question_answer113)
  Witch one of the following numbers represents the ratio of kinematic viscosity to the thermal diftusivity?
  A)
  Grashoff number done clear
  B)
  Prandtl number done clear
  C)
  Mach number     done clear
  D)
  Nusselt number. done clear
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• question_answer114)
  After expansion from a gas turbine, the hot exhaust gases are used to heat the compressed air from a compressor with the help of a cross flow compact heat exchanger of 0.8 effectiveness. What is the number of transfer units of the heat exchanger?
  A)
  2                                  done clear
  B)
  4 done clear
  C)
  8                                  done clear
  D)
  16 done clear
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• question_answer115)
  A thin flat Plate \[2\,m\,\times \,2\,m\] is hanging freely in air. The temperature of the surrounding is \[25{}^\circ C.\] Solar radiation is falling on one side of the plate at the rate of 500 \[W/{{m}^{2}}.\] What should be the convective heat Transfer coefficient in \[W/{{m}^{2}}{}^\circ C,\] if the temperature of The plate is to remain constant at \[30{}^\circ C?\]
  A)
  25                                 done clear
  B)
  50 done clear
  C)
  100                               done clear
  D)
  200 done clear
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• question_answer116)
  In order to achieve maximum heat dissipation, the fin should be designed in such a way that:
  A)
  It should have maximum lateral surface at the root side of the fin done clear
  B)
  It should have maximum lateral surface towards the tip side of the fin done clear
  C)
  It should have maximum lateral surface near the centre of the fin done clear
  D)
  It should have minimum lateral surface near the centre of the fin. done clear
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• question_answer117)
  A composite hollow sphere with steady internal heating is made of 2 layers of materials of equal thickness with thermal conductivities in the ratio of' 1:2 for inner to outer layers. Ratio of inside to outside diameter is 0.8. What is ratio of temperature drop across the inner and outer layers?
  A)
  0.4                                done clear
  B)
  1.6 done clear
  C)
  2 in 0.8             done clear
  D)
  2.5 done clear
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• question_answer118)
  Upto the critical radius of insulation:
  A)
  Added insulation increases heat loss. done clear
  B)
  Added insulation decreases heat loss. done clear
  C)
  Convection heat loss is less than conduction heat loss. done clear
  D)
  Heat flux decreases. done clear
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• question_answer119)
  Match List-I (Governing Equations of Heat Transfer) with List-II (Specific Case of Heat Transfer) and select the correct answer using the code given below the lists:

  List-I (Governing Equations of Heat Transfer)		List-II (Specific Cass of Heat Transfer)
  A.	\[\frac{{{d}^{2}}T}{d{{r}^{2}}}\,+\,\frac{2dT}{rdr}\,=\,0\]	1.	Pin fin 1-D case
  B.	\[\frac{{{\partial }^{2}}T}{\partial {{x}^{2}}}\,+\,\frac{1}{\alpha }\,\frac{\partial T}{dt}\]	2.	1-D conduction in cylinder
  C.	\[\frac{{{d}^{2}}T}{d{{r}^{2}}}\,+\,\frac{1}{r}\,\frac{dT}{dr}\,=\,0\]	3.	1-D conduction in sphere
  D.	\[\frac{{{d}^{2}}\theta }{d{{x}^{2}}}-{{m}^{2}}\theta =0\]	4.	Plane slab

  Codes:
  A)
  A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 done clear
  B)
  A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 done clear
  C)
  A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 done clear
  D)
  A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 done clear
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• question_answer120)
  6.0 kJ of conduction heat transfer has to take place in 10 minutes from one end to other end of a metallic cylinder of 10 cm cross-sectional area, length 1 metre and thermal conductivity as 100 W/m.K. What is the temperature difference between the two ends of the cylindrical bar?
  A)
  \[80{}^\circ C\]             done clear
  B)
  \[100{}^\circ C\] done clear
  C)
  \[120{}^\circ C\]                       done clear
  D)
  \[160{}^\circ C\] done clear
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