Railways NTPC (Technical Ability) Theory of Machines and Machine Design Question Bank

done Theory of Machines Total Questions - 112

• question_answer1)
  Scotch yoke mechanism is used to generate:
  A)
  Sine functions     done clear
  B)
  square roots done clear
  C)
  Logarithms                     done clear
  D)
  inversions done clear
  View Solution play_arrow

• question_answer2)
  In full depth \[14\frac{1}{2}\] degree involute system, the smallest number of teeth in a pinion which meshes with rack without interference is:
  A)
  12                                 done clear
  B)
  16 done clear
  C)
  25                                 done clear
  D)
  32 done clear
  View Solution play_arrow

• question_answer3)
  Inversion of a mechanism is:
  A)
  Changing of a higher pair to lower pair done clear
  B)
  Obtained by fixing different links in a kinematic chain done clear
  C)
  Turning it upside down done clear
  D)
  Obtained by reversing the input and output motion done clear
  View Solution play_arrow

• question_answer4)
  The sense of coriolis component 2 vw is the same as that of the relative velocity vector v rotated:
  A)
  \[45{}^\circ \] In the direction of rotation of the link containing the path done clear
  B)
  \[45{}^\circ \] In the direction opposite to the rotation of the link containing the path done clear
  C)
  \[90{}^\circ \] In the direction of rotation of the link containing the path done clear
  D)
  \[180{}^\circ \] In the direction opposite to the rotation of the link containing the path done clear
  View Solution play_arrow

• question_answer5)
  Match the following \[14\frac{1}{2}\] degree composite system of gears

  List-I		List-II
  A.	Dedendum	1.	\[\frac{2}{P}\]
  B.	Clearance	2.	\[\frac{0.157}{P}\]
  C.	Working depth	3.	\[\frac{1.157}{P}\]
  D.	Addendum	4.	\[\frac{1}{P}\]

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

• question_answer6)
  Certain machine requires a torque of \[(500+50\,\sin 2\theta )\] kN.m to drive it where \[\theta \] is the angle of rotation of shaft measured from certain datum. The machine is directly coupled to an engine which produces a troque \[(500+50\,\sin \theta )\] kN.m in a cycle. How many times the value of torque of machine and engine will be identical?
  A)
  1                                  done clear
  B)
  2 done clear
  C)
  4                                  done clear
  D)
  8 done clear
  View Solution play_arrow

• question_answer7)
  Which of the following are inversions of a double slider crank chain?                           

  1. Whitworth return motion.

  2. Scotch Yoke,

  3. Oldham's Coupling.

  4.  Rotary engine.

  Select correct answer using the codes given below:

  Codes:
  A)
  1 and 2             done clear
  B)
  1, 3 and 4 done clear
  C)
  2 and 3             done clear
  D)
  2, 3 and 4 done clear
  View Solution play_arrow

• question_answer8)
  Match List-I with List-II and select the correct answer using the codes given below the lists.

  List-I		List-II
  A.	Governor	1.	Pantograph device
  B.	Automobile differential	2.	Feed-back control
  C.	Dynamic Absorber	3.	Epicyelic train
  D.	Engine Indicator	4.	Two-mass oscillator

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

• question_answer9)
  Consider the following statements:            

  Coriolis component of acceleration depends on

  1. Velocity of slider.

  2.  Angular velocity of the link.

  3.  Acceleration of slider.

  4.  Angular acceleration of link.

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

• question_answer10)
                    Which one of the following sets of acceleration involved in the motion of the piston inside  cylinder of a uniform rotating cylinder mechanism
  A)
  Coriolis and radial acceleration            done clear
  B)
  Radial and tangential acceleration        done clear
  C)
  Corioiis and gyroscopic acceleration     done clear
  D)
  Gyroscopic and tangential acceleration    done clear
  View Solution play_arrow

• question_answer11)
  If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose  radius is half the mean radius of the farmer,  energy stored in the latter at the same speed will be
  A)
  Four times the first one                 done clear
  B)
  Same as the first one                   done clear
  C)
  One-fourth of the first one              done clear
  D)
  One and a half times the first one   done clear
  View Solution play_arrow

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

  List-I		List-II
  A.	Quadric cycle chain	1.	Elliptic trammel
  B.	Single slider crank   chain	2.	Rapsons slide
  C.	Double slider crank  chain	3.	Ackerman steering
  D.	Crossed slider crank chain	4.	Eccentric mechanism
  		5.	Pendulum pump

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

• question_answer13)
  A flywheel is fitted to the crankshaft of an engine having 'E' amount of indicated work per revolution and permissible limits of coefficients of fluctuation of energy and speed as \[{{K}_{e}}\] and \[{{K}_{s}}\] respectively. The kinetic energy of the flywheel is then given by:
  A)
  \[\frac{2{{K}_{e}}E}{{{K}_{s}}}\]                    done clear
  B)
  \[\frac{{{K}_{e}}E}{2{{K}_{s}}}\] done clear
  C)
  \[\frac{{{K}_{e}}E}{{{K}_{s}}}\]                      done clear
  D)
  \[\frac{{{K}_{s}}E}{2{{K}_{e}}}\] done clear
  View Solution play_arrow

• question_answer14)
  A Hartnell governor has its controlling force F given by \[F=p+qr,\] where r is the radius of the balls and p and q are constants. The governor becomes isochronous when:
  A)
  p = 0 and q is positive done clear
  B)
  p is positive and q = 0 done clear
  C)
  p is negative and q is positive done clear
  D)
  p is positive and q is also positive done clear
  View Solution play_arrow

• question_answer15)
  A system in dynamic balance implies that:
  A)
  The system is critically damped done clear
  B)
  There is no critical speed in the system done clear
  C)
  The system is also statically balanced done clear
  D)
  There will be absolutely no wear of bearings done clear
  View Solution play_arrow

• question_answer16)
  Which one of the following can completely balance several masses revolving in different planes on a shaft?
  A)
  A single mass in one of the planes of the revolving masses done clear
  B)
  A single mass in a different plane done clear
  C)
  Two masses in any two planes done clear
  D)
  Two equal .masses in-any two planes done clear
  View Solution play_arrow

• question_answer17)
  A thin circular disc-is rolling with a uniform linear speed along a straight path on a plane surface.

  Consider the following statements in this regard:

  1. All points of the disc have the same velocity.

  2. The centre of the disc has zero acceleration.

  3. The centre of the disc has centrifugal acceleration.

  4. The point on the disc making contact with the plane surface has zero acceleration.

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

• question_answer18)
  An electric lift is moving downwards with an acceleration of \[\frac{g}{3}.\] The vertical force between a passenger in the lift and its floor is equal to:
  A)
  \[\frac{2}{3}\] of the passenger's weight done clear
  B)
  \[\frac{3}{4}\] of the passenger's weight done clear
  C)
  Passenger's weight done clear
  D)
  \[\frac{4}{3}\] of the passenger's weight done clear
  View Solution play_arrow

• question_answer19)
  In a circular arc cam with roller follower, the acceleration in any position of the lift would depend only upon:
  A)
  Total lift, total angle of lift, minimum radius of cam and cam speed done clear
  B)
  Radius of circular arc cam, speed, location of centre of circular arc and roller diameter done clear
  C)
  Weight of cam follower linkage, spring stiffness and cam speed done clear
  D)
  Total lift, centre of gravity of the cam and cam speed done clear
  View Solution play_arrow

• question_answer20)
  The Klain's method of construction for reciprocating engine mechanism:
  A)
  Is a simplified version of instantaneous centre method done clear
  B)
  Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine done clear
  C)
  Enables determination of Corioli's component done clear
  D)
  Is based on the acceleration diagram done clear
  View Solution play_arrow

• question_answer21)
  Two co-axial rotors having moments of inertia \[{{I}_{1}},{{I}_{2}}\] and angular speeds \[{{\omega }_{1}}\] and \[{{\omega }_{2}}\] respectively are engaged together. The loss of energy during engagement is equal to:
  A)
  \[\frac{{{I}_{1}}{{I}_{2}}{{({{\omega }_{1}}-{{\omega }_{2}})}^{2}}}{2({{I}_{1}}+{{I}_{2}})}\]   done clear
  B)
  \[\frac{{{I}_{1}}{{I}_{2}}{{(\omega _{1}^{2}-\omega _{2}^{2})}^{2}}}{2({{I}_{1}}+{{I}_{2}})}\] done clear
  C)
  \[\frac{2{{I}_{1}}{{I}_{2}}{{({{\omega }_{1}}-{{\omega }_{2}})}^{2}}}{({{I}_{1}}+{{I}_{2}})}\]   done clear
  D)
  \[\frac{{{I}_{1}}\omega _{1}^{2}-{{I}_{2}}\omega _{2}^{2}}{({{I}_{1}}+{{I}_{2}})}\] done clear
  View Solution play_arrow

• question_answer22)
  A spring controlled governor is found unstable. It can be made stable by:
  A)
  Increasing the spring stiffness done clear
  B)
  Decreasing the spring stiffness done clear
  C)
  Increasing the ball weight done clear
  D)
  Decreasing the ball weight done clear
  View Solution play_arrow

• question_answer23)
  If a number of forces act on a rigid body, each force may he replaced by an equal and parallel force acting through a Fixed point, together with a couple. For the rigid body to be in equilibrium:
  A)
  The resultant force at the fixed point must be Zero done clear
  B)
  The resultant couple on the body must be zero done clear
  C)
  Both resultant force and couple must be zero done clear
  D)
  None of the above need be zero done clear
  View Solution play_arrow

• question_answer24)
  A rotor which is balanced statically but not dynamically is supported on two ball bearings L apart and at high speed of the rotor, reaction of the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing: At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will:
  A)
  Remain same as before done clear
  B)
  Become equal to 2R done clear
  C)
  Become equal to \[\frac{1}{2}R\] done clear
  D)
  Become equal to \[\frac{1}{4}R\] done clear
  View Solution play_arrow

• question_answer25)
  Consider the following statements regarding a high speed in-line engine with identical reciprocating parts with cranks spaced to give equal firing intervals:

  1. All harmonic farces, except those which are multiples of half the number of cylinders, are balanced.

  2. Couples are balanced if the engine is symmetrical about a plane normal to the axis of the cranks shaft.

  3. In a four cylinder in-line engine, second and fourth harmonic forces are unbalanced whereas in a six cylinder in-line engine, second fourth and sixth harmonic forces are unbalanced.

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

• question_answer26)
  Consider the following statements regarding the differential of an automobile:

  1. The speed of the crown wheel will always be the mean of the speeds of the two road wheels.

  2. The road wheel speeds are independent of the number of teeth on the planets.

  3. The difference between the speed of the road wheels depends on the number of teeth on the planets.

  4. The ratio of speeds of the road wheels depends upon the number of teeth on the gear wheels attached to them and on the crown wheel.

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

• question_answer27)
  The instantaneous centre of rotation of a rigid thin disc rolling on a plane rigid surface is located at:
  A)
  The centre of the disc done clear
  B)
  An infinite distance on the plane surface done clear
  C)
  The point of contact done clear
  D)
  The point on the circumference situated vertically opposite to the contact point done clear
  View Solution play_arrow

• question_answer28)
  Consider the following statements:

  1. Round bar in a round hole forms a turning pair.

  2. A square bar in a square hole forms a sliding pair.

  3. A vertical shaft in a foot-step bearing forms successful constraint.

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

• question_answer29)
                         For a spring controlled governor to be stable.  controlling force (F) is related to the radius (r)  equation:                                   
  A)
  \[F=ar-b\]                      done clear
  B)
  \[F=ar+b\] done clear
  C)
  \[F=ar\]             done clear
  D)
  \[F=\text{a/r}+b\] done clear
  View Solution play_arrow

• question_answer30)
  Which one of the following is an Open Pair?  
  A)
  Ball and socket joint done clear
  B)
  Journal bearing done clear
  C)
  Lead screw and nut         done clear
  D)
  Cam and follower done clear
  View Solution play_arrow

• question_answer31)
  In a 4-stroke I.C engine, the turning moment during the compression stroke is:                   
  A)
  Positive throughout                      done clear
  B)
  Negative throughout                     done clear
  C)
  Positive during major portion of the stroke done clear
  D)
  Negative during major portion of the stroke done clear
  View Solution play_arrow

• question_answer32)
  Match List-I (Applications) with List-II (drive element) and select the correct answer using the given below the lists:

  List-I		List-II
  A.	Automobile differential	1.	Flat belt
  B.	Bicycle	2.	belt
  C.	Planning machine	3.	Chain drive
  D.	Radiator fan of automobile motion	4.	Gear drive

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

• question_answer33)
               Which of the following statements hold good for a multi-collar thrust bearing carrying an axial dlW unit?                                  

  1. Friction moment is independent of the number of collars.

  2. The intensity of pressure is affected by the number of collars.

  3. Coefficient of friction of the bearing surface is affected by the number of collars.

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

• question_answer34)
  The centre of gravity of the coupler link in a 4-bar mechanism would experience:           
  A)
  No acceleration                          done clear
  B)
  Only linear acceleration                  done clear
  C)
  Only angular acceleration                done clear
  D)
  Both linear and angular accelerations    done clear
  View Solution play_arrow

• question_answer35)
    Which of the following statements regarding laws governing the friction between dry surfaces are correct?

  1. The friction force is dependent on the velocity of sliding.

  2. The friction force is directly proportional to the normal force.

  3. The friction force is dependent on the materials of the contact surfaces.

  4. The friction force is dependent on the area of contact surfaces.

  A)
  2, 3 and 4                      done clear
  B)
  1 and 3 done clear
  C)
  2 and 4             done clear
  D)
  1, 2, 3 and 4 done clear
  View Solution play_arrow

• question_answer36)
  Which of the following statements are correct?

  1. For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of the gears.

  2. For involute gears the pressure angle changes with change in centre distance between gears.

  3. The velocity ratio of compound gear train depends upon the number of teeth of the input and output gears only.

  4. Epicyclic gear trains involve rotation of at least one gear axis about some other gear axis.

  A)
  1, 2 and 3                      done clear
  B)
  1 and 3 done clear
  C)
  1, 2 and 4                      done clear
  D)
  2, 3 and 4 done clear
  View Solution play_arrow

• question_answer37)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I		List-II
  A.	Hunting	1.	One radius of rotation for each speed.
  B.	Isochronism	2.	Too sensitive
  C.	Stability	3.	Mean force exerted at the sleeve during change of speed
  D.	Effort	4.	Constant equilibrium speed for various radii of rotation

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

• question_answer38)
  A system of masses rotating in different parallel planes is in dynamic balance if the resultant:
  A)
  Force is equal to zero done clear
  B)
  Couple is equal to zero done clear
  C)
  Force and the resultant couple are both equal to zero done clear
  D)
  Force is numerically equal to the resultant couple, but neither of them need necessarily be zero done clear
  View Solution play_arrow

• question_answer39)
  A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of the bigger gear is:
  A)
  \[\frac{2}{4}\]                           done clear
  B)
  3 done clear
  C)
  4                                  done clear
  D)
  5 done clear
  View Solution play_arrow

• question_answer40)
  An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the:
  A)
  Tip of the gear tooth and flank of pinion done clear
  B)
  Tip of the pinion and flank of gear done clear
  C)
  Flanks of both gear and pinion done clear
  D)
  Tips of both gear and pinion done clear
  View Solution play_arrow

• question_answer41)
  Given \[\theta =\] angle through which the axis of the outer forward wheel turns

  \[\phi =\]Angle through which the axis of the inner forward wheel turns

  a = distance between the pivots of front axle and

  b = wheel base

  For correct steering, centre lines of the axes of four wheels of an automobile should meet at a common point. This condition will be satisfied if:
  A)
  \[\cos \theta -\cos \phi =\frac{a}{b}\]       done clear
  B)
  \[\cot \theta -\cot \phi =\frac{a}{b}\] done clear
  C)
  \[\cos \theta +\cos \phi =\frac{a}{b}\]      done clear
  D)
  \[tan\theta +tan\phi =\frac{b}{a}\] done clear
  View Solution play_arrow

• question_answer42)
  If air resistance is neglected while it is executing small oscillations, the acceleration of the bob of a simple pendulum at the midpoint of its swing will be:
  A)
  Zero done clear
  B)
  A minimum but not equal to zero done clear
  C)
  A maximum done clear
  D)
  Not determinable unless the length of the pendulum and the mass of the bob are known done clear
  View Solution play_arrow

• question_answer43)
  In order to draw the acceleration diagram, it is necessary to determine the Coriolis component of acceleration in the case of:
  A)
  Crank and slotted lever quick return mechanism done clear
  B)
  slider-crank mechanism done clear
  C)
  four-bar mechanism done clear
  D)
  Pantograph done clear
  View Solution play_arrow

• question_answer44)
  What is the correct sequence of the following steps in engine analysis?

  1. Vibration analysis

  2. Inertia force analysis

  3.  Balancing analysis

  4. Velocity and Acceleration analysis

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

• question_answer45)
  If \[\mu \] is the actual coefficient of friction in a belt moving in grooved pulley, the groove angle being \[2\alpha ,\] the virtual coefficient of friction will be:
  A)
  \[\frac{\mu }{\sin \alpha }\]                     done clear
  B)
  \[\frac{\mu }{\cos \alpha }\] done clear
  C)
  \[\mu \sin \alpha \]                      done clear
  D)
  \[\mu \cos \alpha \] done clear
  View Solution play_arrow

• question_answer46)
  Match List-I (positioning of two shafts) with List-II (possible connection) and select the correct answer using the codes given below the Lists:

  List-I		List-II
  A.	Parallel shafts with slight offset	1.	Hooke's joint
  B.	Parallel shafts at a reasonable distance	2.	Worm and wheel
  C.	Perpendicular shafts	3.	Oldham coupling
  D.	Intersecting shafts	4.	Belt and pulley

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

• question_answer47)
  Match List-I with List-II and select the correct answer using the codes given below the Lists:

  List-I		List-II
  A.	Quadric cycle chain	1.	Rapson's slide
  B.	Single slider crank chain	2.	Oscillating cylinder engine mechanism
  C.	Double slider crank chain	3.	Ackermann steering mechanism
  D.	Crossed slider crank chain	4.	Oldham coupling

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

• question_answer48)
  Match List-I with List-II and select the correct answer using the codes given below the Lists:

  List-I		List-II
  A.	Flywheel	1.	Dunkerley Method
  B.	Flywheel	2.	Turning Moment
  C.	Governor	3.	d' Alembert's Principle
  D.	Inertia Force	4.	Speed control on bar with load

  Codes:
  A)
  A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 done clear
  B)
  A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 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_answer49)
  The sensitivity of an isochronous governor is:   
  A)
  Zero                              done clear
  B)
  one              done clear
  C)
  Two                              done clear
  D)
  infinity        done clear
  View Solution play_arrow

• question_answer50)
    When the primary direct crank of a reciprocating engine is positioned at \[30{}^\circ \] clockwise, the secondary reverse crank for balancing will be at:         
  A)
  \[30{}^\circ \]anticlockwise         done clear
  B)
  \[60{}^\circ \]anticlockwise done clear
  C)
  \[30{}^\circ \]clockwise  done clear
  D)
  \[60{}^\circ \]clockwise    done clear
  View Solution play_arrow

• question_answer51)
  A reverted gear train is one in which the output shaft
  A)
  Rotate in opposite directions done clear
  B)
  Are co-axial                done clear
  C)
  Are at right angles to each other              done clear
  D)
  Are at an angle to each other  done clear
  View Solution play_arrow

• question_answer52)
               In the case of an involute toothed gear, involute starts
  A)
  Addendum circle done clear
  B)
  dedundum circle done clear
  C)
  Pitch circle                     done clear
  D)
  base circle   done clear
  View Solution play_arrow

• question_answer53)
     Two geared shafts A and B having moments of inertia \[{{l}_{a}}\] and \[{{l}_{b}}\] angular acceleration \[{{\alpha }_{a}}\] and \[{{\alpha }_{b}}\] respectively arc meshed together. B rotates at G time the speed or A. If the gearing efficiency of the  shafts is n, then is order to accelerate B, the to which must be applied to A will be:
  A)
  \[{{I}_{a}}{{\alpha }_{a}}+{{G}^{2}}{{I}_{b}}\frac{{{\alpha }_{a}}}{\eta }\]          done clear
  B)
  \[{{G}^{2}}{{I}_{a}}\frac{{{\alpha }_{b}}}{\eta }\] done clear
  C)
  \[{{G}^{2}}{{I}_{a}}\frac{{{\alpha }_{a}}}{\eta }\]                done clear
  D)
  \[{{G}^{2}}{{I}_{b}}\frac{{{\alpha }_{b}}}{\eta }\]        done clear
  View Solution play_arrow

• question_answer54)
  ..Which of the following pair (s) is/are correctly matched?

  I. Four-bar chain ....Oscillating-oscillating converter

  II. Inertia governor ...Rate of change of engine speed

  III. Hammer blow ?Reciprocating unbalance

  Select the correct answer using the codes given below
  A)
  I alone               done clear
  B)
  I, II and III    done clear
  C)
  II and III                        done clear
  D)
  I and III       done clear
  View Solution play_arrow

• question_answer55)
  The pitching of a ship in the ocean is an oscillatory periodic motion. A ship is pitching \[6{}^\circ \] above and \[6{}^\circ \] below with a period of 20s from its horizontal plane.

  Consider the following statements in this regard:

  1. The motion has a frequency of oscillation (i.e. pitching) of 3 cycles/minute.

  2. The motion has an angular frequency of 3.14 rad/s

  3. The angular velocity of precession of ship?s rotor is \[\frac{\pi }{300}\] rad/s

  4. The amplitude of pitching is \[\frac{\pi }{30}\] rad

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

• question_answer56)
  Which of the following pairs are correctly matched? Select the correct answer using the codes given below the pairs.

  Mechanism		Chain from which derived
  1.	Whitworth quick return motion	Single slider crank chain
  2.	Oldham's coupling	Four-bar chain
  3.	Scotch Yoke	Double slider crank chain

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

• question_answer57)
  In S.H.M. with respect to the displacement vector, the positions of Velocity vector and Acceleration vector will he respectively:
  A)
  \[180{}^\circ \]and \[90{}^\circ \]          done clear
  B)
  \[90{}^\circ \]and\[180{}^\circ \] done clear
  C)
  \[0{}^\circ \]and \[90{}^\circ \]              done clear
  D)
  \[90{}^\circ \]and\[0{}^\circ \] done clear
  View Solution play_arrow

• question_answer58)
  When a slider moves with a velocity V on a link rotating at an angular speed of co, the Corioli's component of acceleration is given by:
  A)
  \[\sqrt{2v\omega }\]                    done clear
  B)
  \[v\omega \] done clear
  C)
  \[\frac{v\omega }{2}\]                            done clear
  D)
  \[2v\omega \] done clear
  View Solution play_arrow

• question_answer59)
  The total number of instantaneous centres for a mechanism consisting of 'n' links is:
  A)
  \[\frac{n}{2}\]                           done clear
  B)
  \[n\] done clear
  C)
  \[\frac{n-1}{2}\]                         done clear
  D)
  \[\frac{n(n-1)}{2}\] done clear
  View Solution play_arrow

• question_answer60)
   Two links OA and OB are connected by a pin joint at 'O'. The link OA turns with angular velocity \[{{\omega }_{1}}\] radians per second in the clockwise direction and the link OB turns with angular velocity \[{{\omega }_{2}}\] radians per second in the anticlockwise direction. If the radius of the pin at 'O' is 'r' then the rubbing velocity at the pin joint 'O' will be:
  A)
  \[{{\omega }_{1}}.{{\omega }_{2}}.r\]               done clear
  B)
  \[({{\omega }_{1}}-{{\omega }_{2}})r\] done clear
  C)
  \[({{\omega }_{1}}+{{\omega }_{2}})r\]                        done clear
  D)
  \[({{\omega }_{1}}+{{\omega }_{2}})2r\] done clear
  View Solution play_arrow

• question_answer61)
  In a cam drive, it is essential to offset the axis of a follower to:
  A)
  Decrease the side thrust between the follower and guide done clear
  B)
  Decrease the wear between follower and cam surface done clear
  C)
  Take care of space limitation done clear
  D)
  Reduce the cost done clear
  View Solution play_arrow

• question_answer62)
  The working surface above the pitch surface of the gear tooth is termed as:
  A)
  Addendum                     done clear
  B)
  Dedendum done clear
  C)
  Flank                 done clear
  D)
  Face done clear
  View Solution play_arrow

• question_answer63)
  In the case of a flywheel, the maximum fluctuation of energy is the:
  A)
  Sum of maximum and minimum energies done clear
  B)
  Difference between the maximum and minimum energies done clear
  C)
  Ratio of the maximum and minimum energy done clear
  D)
  Ratio of the minimum and maximum energy done clear
  View Solution play_arrow

• question_answer64)
  Match List-I with List-II and select the correct answer using the codes given below the Lists:

  List-I		List-II
  A.	Compound train	1.	Hart mechanism
  B.	Quick return mechanism	2.	Coriolis force
  C.	Exact straight line motion	3.	Transmission of motion around  bends and comers
  D.	Approximate straight line motion	4.	Watt mechanism

  Codes:
  A)
  A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 done clear
  B)
  A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 done clear
  C)
  A\[\to \]3, B\[\to \]4, C\[\to \]1, 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_answer65)
  Given that

  m = mass of the ball of the governor,

  \[\omega \,\,=\] angular velocity of the governor and

  g = accelerate due to gravity,

  The height of Watt's governor is given by:
  A)
  \[\frac{g}{2{{\omega }^{2}}}\]             done clear
  B)
  \[\frac{g}{{{\omega }^{2}}}\] done clear
  C)
  \[\frac{\sqrt{2g}}{{{\omega }^{2}}}\]               done clear
  D)
  \[\frac{g}{{{\omega }^{2}}}\] done clear
  View Solution play_arrow

• question_answer66)
  Match List-I with List-II and select the correct answer using the codes given below the lists:

  List-I		List-II
  A.	End thrust	1.	Plain bearing
  B.	No cage	2.	Ball bearing
  C.	More accurate centering	3.	Needle bearing
  D.	Can be overloade	4.	Tapered roller bearing

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

• question_answer67)
  For a given fractional change of speed, if the displacement of the sleeve is high, then the governor is said to be:
  A)
  Hunting             done clear
  B)
  Isochronous done clear
  C)
  Sensitive                        done clear
  D)
  Stable done clear
  View Solution play_arrow

• question_answer68)
  In a multi-cylinder in-line internal combustion engine, even number of cylinders is chosen so that:
  A)
  Uniform firing order is obtained done clear
  B)
  The couples are balanced done clear
  C)
  Primary forces are balanced done clear
  D)
  Secondary forces arc balanced done clear
  View Solution play_arrow

• question_answer69)
  Match List-I with List-II and select the correct answer using the codes given below the Lists:

  List-I		List-II
  A.	4 links, 4 turning pair	1.	Complete constraint
  B.	3 links, 3 turning pair	2.	Successful constraint
  C.	5 links, 5 turning pair	3.	Rigid Frame
  D.	Footstep bearing	4.	Incomplete  constant

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

• question_answer70)
  The relative acceleration of two points which are at variable distance apart on a moving link can he determined by using the:
  A)
  Threecentres in line theorem done clear
  B)
  Instantaneous centre of rotation method done clear
  C)
  Coriolis component of acceleration method done clear
  D)
  Klein's construction done clear
  View Solution play_arrow

• question_answer71)
  Which one of the following pairs is correctly matched?
  A)
  Governors....Interference done clear
  B)
  Gears....Hunting done clear
  C)
  Klein's construction....Acceleration at piston done clear
  D)
  Cam....Pinion done clear
  View Solution play_arrow

• question_answer72)
  The primary disturbing force due to inertia of reciprocating parts of mass m at radius r moving with an angular velocity \[\omega \] is given by:
  A)
  \[m{{\omega }^{2}}r\sin \theta \]                       done clear
  B)
  \[m{{\omega }^{2}}r\cos \theta \] done clear
  C)
  \[m{{\omega }^{2}}r\frac{\sin 2\theta }{n}\]                  done clear
  D)
  \[m{{\omega }^{2}}r\frac{\cos 2\theta }{n}\] done clear
  View Solution play_arrow

• question_answer73)
  Consider the following statements:

  A pinion of \[14\frac{1{}^\circ }{2}\] pressure angle and 48 involute teeth has a pitch circle diameter of 28.8 cm. It has

  1. Module of 6 mm

  2. Circular pitch of 18 nun

  3. Addendum of 6 mm

  4. Diametral pitch of \[\frac{11}{113}\]

  Which of these statements are correct?
  A)
  2 and 3             done clear
  B)
  1 and 3 done clear
  C)
  1 and 4             done clear
  D)
  2 and 4 done clear
  View Solution play_arrow

• question_answer74)
  For a given lift of the follower in a given angular motion of the cam, the acceleration/ retardation  the follower will be the least when the profile of the cam during the rise portion is:               
  A)
  Such that the follower motion is simple harmonic done clear
  B)
  Such that the follower motion has a constant velocity from start to end               done clear
  C)
  A straight line, it being a tangent cam       done clear
  D)
  Such that the follower velocity increases linearly for half the rise portion and then decreases linearly for the remaining half of the rise portion done clear
  View Solution play_arrow

• question_answer75)
  Consider the following statements regarding the choice of conjugate teeth for the profile of mating gears:

  1. They will transmit the desired motion.

  2. They are difficult to manufacture.

  3. Standardization is not possible.

  4. The cost of production is low.

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

• question_answer76)
  The motion transmitted between the teeth of two spur gears in mesh is generally: 
  A)
  Sliding done clear
  B)
  Rolling done clear
  C)
  Rotary done clear
  D)
  Partly sliding and partly rolling    done clear
  View Solution play_arrow

• question_answer77)
          In a single slider four-bar linkage, when the slider is fixed, it forms a mechanism of:
  A)
  Hand pump done clear
  B)
  Rolling done clear
  C)
  Quick return                            done clear
  D)
  Oscillating cylinder    done clear
  View Solution play_arrow

• question_answer78)
                     Consider the following parameters:          

  1. Limit of peripheral speed

  2. Limit of centrifugal stress

  3. Coefficient of fluctuation of speed

  4. Weight of the rim

  Which of these parameters are used in the calculation of the diameter of flywheel rim?         
  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_answer79)
  Consider the following speed governors:   

  1. Porter governor

  2. Hartnell governor

  3. Watt governor

  4. Proell governor.

  The correct sequence of development of these governors is:
  A)
  1, 3, 2, 4 done clear
  B)
  3, 1, 4, 2 done clear
  C)
  3, 1, 2, 4 done clear
  D)
  1, 3, 4, 2 done clear
  View Solution play_arrow

• question_answer80)
  If a two-mass system is dynamically equivalent to a rigid body, then the system will not satisfy the condition that the:                    
  A)
  Sum of the two masses must be equal to that of the rigid body done clear
  B)
  Polar moment of inertia of the system should be equal to that of the rigid body done clear
  C)
  Centre of gravity (e.g.) of the system should coincide with that of the rigid body done clear
  D)
  Total moment of inertia about the axis through e.g. must be equal to that of the rigid body done clear
  View Solution play_arrow

• question_answer81)
  A rigid shaft when laid on horizontal parallel ways will not roll if the:
  A)
  Centre of gravity falls parallel to shaft axis done clear
  B)
  Centre of gravity lies on the shaft axis done clear
  C)
  Horizontal moments are large done clear
  D)
  Vertical moments are large done clear
  View Solution play_arrow

• question_answer82)
  If the ratio of the length of connecting rod to the crank radius increases, then:
  A)
  Primary unbalanced forces will increase done clear
  B)
  Primary unbalanced forces-will decrease done clear
  C)
  Secondary unbalanced forces will increase done clear
  D)
  Secondary unbalanced forces will decrease done clear
  View Solution play_arrow

• question_answer83)
  Match List-I with List-II and select the correct answer using the codes given below the Lists:

  List-I		List-II
  A.	Quick return mechanism	1.	Lathe
  B.	Apron mechanism	2.	Milling machine
  C.	Indexing mechanism	3.	Shaper
  D.	Regulating wheel	4.	Centre less grinding

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

• question_answer84)
  A point on a link connecting a double slider crank chain-will trace a:
  A)
  Straight line                    done clear
  B)
  circle done clear
  C)
  Parabola                        done clear
  D)
  ellipse done clear
  View Solution play_arrow

• question_answer85)
  A wheel is rolling on a straight level track with a uniform velocity 'v'. The instantaneous velocity of a point on the wheel lying at the mid-point of a radius:
  A)
  Varies between \[3\frac{v}{2}\] and \[-\frac{v}{2}\] done clear
  B)
  Varies between \[\frac{v}{2}\] and \[-\frac{v}{2}\] done clear
  C)
  Varies between 3 \[3\frac{v}{2}\] and \[-\frac{v}{2}\] done clear
  D)
  Does not vary and is equal to v done clear
  View Solution play_arrow

• question_answer86)
  A four-bar chain has:
  A)
  All turning pairs done clear
  B)
  One turning pair and the others are sliding pairs done clear
  C)
  One sliding pair and the others are turning pairs done clear
  D)
  All sliding pairs done clear
  View Solution play_arrow

• question_answer87)
  Sensitiveness of a governor is denned as:
  A)
  \[\frac{Ranjge\,\,of\,\,speed}{2\times Mean\,\,speed}\] done clear
  B)
  \[\frac{2\times Mean\,\,speed}{Ranjge\,\,of\,\,speed}\] done clear
  C)
  \[Mean\,\,speed\times Ranjge\,\,of\,\,speed\] done clear
  D)
  \[\frac{Ranjge\,\,of\,\,speed}{Mean\,\,speed}\] done clear
  View Solution play_arrow

• question_answer88)
  The velocity ratio in the case of the compound train of wheels is equal to:
  A)
  \[\frac{No\,\,of\,\,teeth\,\,on\,\,first\,\,drivers}{No\,\,of\,\,teeth\,\,on\,\,last\,\,follower}\] done clear
  B)
  \[\frac{No\,\,of\,\,teeth\,\,on\,\,last\,\,follower}{No\,\,of\,\,teeth\,\,on\,\,first\,\,drivers}\] done clear
  C)
  \[\frac{\text{Produc}t\,\,of\,\,teeth\,\,on\,\,the\,\,drivers}{\text{Product}\,\,of\,\,teeth\,\,on\,\,the\,\,follower}\] done clear
  D)
  \[\frac{\text{Produc}t\,\,of\,\,teeth\,\,on\,\,the\,\,follower}{\text{Product}\,\,of\,\,teeth\,\,on\,\,the\,\,drivers}\] done clear
  View Solution play_arrow

• question_answer89)
    Consider the following pairs of parts:

  1. Pair of gear in mesh

  2. Belt and pulley

  3. Cylinder and piston.

  4. Cam and follower

  Among these, the higher pairs are:
  A)
  1 and 4             done clear
  B)
  2 and 4 done clear
  C)
  1, 2 and 3                      done clear
  D)
  1, 2 and 4 done clear
  View Solution play_arrow

• question_answer90)
  A Kaplan turbine is a:
  A)
  Outward flow reaction turbine done clear
  B)
  Inward flow impulse turbine done clear
  C)
  Low head axial flow turbine done clear
  D)
  High head mixed flow turbine done clear
  View Solution play_arrow

• question_answer91)
  Which of the following hydraulic turbines are reaction turbines?

  1. Francis

  2. Kaplan

  3. Propeller

  A)
  1, 2 and 3                      done clear
  B)
  1 and 2 only done clear
  C)
  2 and 3 only                  done clear
  D)
  1 and 3 only done clear
  View Solution play_arrow

• question_answer92)
  In modem steam generator, the correct path of gases from boiler furnace to chimney is:
  A)
  Boiler furnace. Economizer, Air preheater, Superheater and Chimney done clear
  B)
  Boiler furnace, Superheater, Air preheater, Economizer and Chimney done clear
  C)
  Boiler furnace. Air preheater, Superheater, Economizer and Chimney done clear
  D)
  Boiler furnace. Superheater, Economizer, Air preheater and Chimney done clear
  View Solution play_arrow

• question_answer93)
  Clapeyron's equation is used for finding out the:
  A)
  'Dryness fraction of steam only done clear
  B)
  Entropy of superheated vapour only done clear
  C)
  Specific volume at any temperature and pressure. done clear
  D)
  Total heat of superheated steam only done clear
  View Solution play_arrow

• question_answer94)
  In a locomotive boiler, the draught is produced by:
  A)
  Chimney                        done clear
  B)
  ID fan done clear
  C)
  FD fan               done clear
  D)
  Steam jet done clear
  View Solution play_arrow

• question_answer95)
  Out of the following impurities generally found in water, which one requires special consideration in case of very high pressure boilers?
  A)
  Hydrogen                       done clear
  B)
  Ammonia done clear
  C)
  Silica                 done clear
  D)
  Dissolved salts done clear
  View Solution play_arrow

• question_answer96)
  Willans line represents:
  A)
  Total steam consumption vs. power output with throttle governing done clear
  B)
  Total steam consumption vs. power output with cutoff governing done clear
  C)
  (e) Behaviour of supersaturated steam through nozzles done clear
  D)
  Condensation of steam while flowing through the turbine done clear
  View Solution play_arrow

• question_answer97)
  Consider the following statements for an incompressible fluid flowing through a convergent-divergent duct:               

  1. The convergent part acts as a nozzle.

  2. The divergent part acts as a diffuser.

  3. The maximum limiting speed of the fluid is the sonic velocity.

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

• question_answer98)
  An isentropic nozzle is discharging steam through critical pressure ratio. If the back pressure is further decreased, the discharge will:
  A)
  Decrease done clear
  B)
  Increase done clear
  C)
  Remain unaffected done clear
  D)
  Come to a dead stop due to shock waves done clear
  View Solution play_arrow

• question_answer99)
  State of a wet vapour cannot be specified only by:
  A)
  Pressure and temperature done clear
  B)
  Pressure and dryness fraction done clear
  C)
  Temperature and dryness fraction done clear
  D)
  Pressure and volume done clear
  View Solution play_arrow

• question_answer100)
  Pertaining to a steam boiler, which of the following statements is correct?
  A)
  Primary boiler heat transfer surface Includes evaporator section, economizer and air preheater done clear
  B)
  Primary boiler heat transfer surface includes evaporator section, economizer and superheater section done clear
  C)
  Secondary boiler heat transfer surface includes superheater, economizer and air preheater done clear
  D)
  Primary boiler heat transfer surface includes evaporator section, superheater section and reheat section done clear
  View Solution play_arrow

• question_answer101)
  Which of the following statements is not correct for the volumetric efficiency of a reciprocating air compressor?
  A)
  It decreases with increase in ambient temperature done clear
  B)
  It increases with decrease in pressure ratio done clear
  C)
  It increases with decrease in clearance ratio done clear
  D)
  It decreases with increase in delivery pressure done clear
  View Solution play_arrow

• question_answer102)
  In a single stage reciprocating air compressor, the work done on air to compress it from suction pressure to delivery pressure will be minimum when the compression is:                           
  A)
  Isothermal process                      done clear
  B)
  Adiabatic process                        done clear
  C)
  Polytropic process                        done clear
  D)
  Constant pressure process        done clear
  View Solution play_arrow

• question_answer103)
          In an axial flow compressor, stalling is the phenomenon of:                                          
  A)
  Air motion at some velocity             done clear
  B)
  Air stream blocking the passage          done clear
  C)
  Reversed flow of air                    done clear
  D)
  Air stream not following the blade contour done clear
  View Solution play_arrow

• question_answer104)
  In Rayleigh flow at subsonic Mach numbers, heat addition:                                
  A)
  Decreases static pressure                 done clear
  B)
  Decreases enthalpy                    done clear
  C)
  Increases static pressure                 done clear
  D)
  Decreases static temperature     done clear
  View Solution play_arrow

• question_answer105)
         The function of economizer in a boiler is to:  
  A)
  Superheat the steam                    done clear
  B)
  Reduce fuel consumption              done clear
  C)
  Increase steam pressure                   done clear
  D)
  Maintain saturation temperature done clear
  View Solution play_arrow

• question_answer106)
             In which modification of simple gas turbine cycle, is work ratio increased?                   

  1. Regenerative gas turbine cycle

  2. Gas turbine cycle with reheating

  A)
  Both 1 and 2                  done clear
  B)
  1 only          done clear
  C)
  2 only               done clear
  D)
  Neither 1 only 2 done clear
  View Solution play_arrow

• question_answer107)
  Reheat between multi-stage expansions Joule cycle increases                                 

  1. Overall work output

  2. The work ratio

  3. The thermal efficiency

  Which of the above are correct?          
  A)
  1, 2 and 3                      done clear
  B)
  1 and 2 only                          done clear
  C)
  2 and 3 only                  done clear
  D)
  1 and 3 only      done clear
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• question_answer108)
                         For a given discharge in a channel at critical depth:
  A)
  The specific energy is minimum       done clear
  B)
  The specific energy is maximum       done clear
  C)
  The total energy is minimum          done clear
  D)
  The total energy is maximum      done clear
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• question_answer109)
      Flow takes place at Reynolds number of 1500 in two different pipes with relative roughness of 0001 and 0002. The friction factor:                
  A)
  Will be higher in case of pipe with relative roughness of 0001                          done clear
  B)
  Will be higher in case of pipe with relative ness of 0.002                         done clear
  C)
  Will be same in both pipes            done clear
  D)
  In the two pipes cannot be compared on the basis of data given  done clear
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• question_answer110)
                     Weber number is ratio of square root of inertia force to:
  A)
  Surface force                  done clear
  B)
  Gravity force done clear
  C)
  Pressure force     done clear
  D)
  Viscous force done clear
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• question_answer111)
  What is the correct statement regarding normal shock wave in a gas?
  A)
  Normal shock is reversible done clear
  B)
  The downstream flow as well as upstream flow is supersonic done clear
  C)
  The entropy increases across the shock done clear
  D)
  The entropy remains constant done clear
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• question_answer112)
  Across a normal shock:
  A)
  The pressure and temperature rise done clear
  B)
  The density and temperature decrease done clear
  C)
  The velocity and pressure increase done clear
  D)
  The velocity and pressure decrease done clear
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