Railways NTPC (Technical Ability) Engineering Mechanics and Strength of Materials Question Bank

done Engineering Mechanics Total Questions - 120

• question_answer1)
  Enriched uranium is required as fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has:
  A)
  High neutron absorption cross-section done clear
  B)
  Low moderating efficiency done clear
  C)
  High neutron scatter cross-section done clear
  D)
  Low neutron absorption cross-section done clear
  View Solution play_arrow

• question_answer2)
  An elevator weighing 100 kN attains an upward velocity of 4 m/s in two seconds with uniform acceleration. The tension in the cable will be approximately:
  A)
  30 Kn                done clear
  B)
  100 kN done clear
  C)
  120 kN              done clear
  D)
  200 kN. done clear
  View Solution play_arrow

• question_answer3)
  Electric lift is moving downwards with an acceleration of g/3 the vertical force between a passenger in the lift and its floor is equal to:
  A)
  2/3rd of the passenger's weight done clear
  B)
  3/4th of the passenger's weight done clear
  C)
  Passenger's weight done clear
  D)
  4/3 times the passenger's weight done clear
  View Solution play_arrow

• question_answer4)
  A spring of stiffness k is compressed by a length 'A' and a ball is placed on the top of it. When the spring is released the ball is seen to rise through a height h. When two such springs are kept one over the other, and the combination is compressed by same length X what is the height reached by the ball, kept on the combined springs when released?
  A)
  h/2                                done clear
  B)
  h done clear
  C)
  \[\sqrt{2}h\]                               done clear
  D)
  2h done clear
  View Solution play_arrow

• question_answer5)
  Which one of the following principles laws converts a dynamics problems to an equivalent statics problem?
  A)
  Newton's second law of motion done clear
  B)
  D' Alembert's principle done clear
  C)
  Principle of conservation of energy done clear
  D)
  Principle of conservation of momentum done clear
  View Solution play_arrow

• question_answer6)
  Match List-I with List-II and select the correct answer using the codes given below the lists: (these pertain to nuclear reactors)

  List-I		List-II
  A.	Coolant	1.	Carbon dioxide
  B.	Control	2.	Zirconium
  C.	Poison	3.	Cadmium
  D.	Cladding	4.	Graphite
  		5.	Hafnium

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

• question_answer7)
  Which one of the following principles cannot be used to solve problems involving friction?            
  A)
  D' Alembert's principle                     done clear
  B)
  Equations of Motion                     done clear
  C)
  Principle of work and energy           done clear
  D)
  Conservation of energy      done clear
  View Solution play_arrow

• question_answer8)
                The length of the chest-expander spring when it is unstretched, is 0.6 m and its stiffness is 10 N/mm  The work done in stretching it to 1 m will be:    
  A)
  800 J                done clear
  B)
  1600 J             done clear
  C)
  3200 J               done clear
  D)
  6400 J           done clear
  View Solution play_arrow

• question_answer9)
    Crushed ore is dropped on a conveyor belt at the rate of 300 kg/s. The belt moves, it speed of 2 m/s. the net force acting on the belt that keeps it moving at the same speed is:                            
  A)
  30 N                             done clear
  B)
  60 N              done clear
  C)
  300 N/m                        done clear
  D)
  600 A            done clear
  View Solution play_arrow

• question_answer10)
  Two pieces of steel and brass weighing 20 N and 10 N respectively fall freely under the action of gravity from a tower. For the two pieces which one of the following will be equal after falling and equal distance?                                    
  A)
  Acceleration                   done clear
  B)
  Momentum        done clear
  C)
  Potential energy  done clear
  D)
  Kinetic energy     done clear
  View Solution play_arrow

• question_answer11)
  If tension in the rope of a lift while moving up is double the tension when moving down, the acceleration of lift is
  A)
  g/2                                done clear
  B)
  g/3                 done clear
  C)
  g/4                                done clear
  D)
  g/5              done clear
  View Solution play_arrow

• question_answer12)
    A rectangular block of width/\[ft\] and height h is resting on a rough horizontal floor. A horizontal pull is to be applied at any height on the block. In order to avoid overturning, b/h should be:                    
  A)
  Less than \[\mu \]                       done clear
  B)
  more than \[\mu \]     done clear
  C)
  Less than\[2\mu \]                       done clear
  D)
  more than \[2\mu \]  done clear
  View Solution play_arrow

• question_answer13)
     Two bodies of weight 100 N and 200 N are resting on two smooth inclined planes. The bodies are connected by a rope passing over a pulley at the junction of the planes. If inclination of planes is \[30{}^\circ \] and \[45{}^\circ ,\] then the tension in the rope will be:   
  A)
  80 N                             done clear
  B)
  100 N            done clear
  C)
  200 N                done clear
  D)
  300 N done clear
  View Solution play_arrow

• question_answer14)
              At what height from the base of a pillar must the end of a rope of length/ be fixed so that a man standing on the ground and pulling it at the other end may have the greatest tendency to overturn the pillar:     
  A)
  \[l/2\]                             done clear
  B)
  \[l\,/3\] done clear
  C)
  \[l\,\text{/}\sqrt{\text{2}}\]                      done clear
  D)
  \[3\,l\,/4\] done clear
  View Solution play_arrow

• question_answer15)
  A man wishes to move a heavy block resting on a rough floor. How he can do it with minimum effort?
  A)
  By pulling with a rope                       done clear
  B)
  By pushing                                done clear
  C)
  By tipping it over                          done clear
  D)
  Impossible to move   done clear
  View Solution play_arrow

• question_answer16)
                     D Alemberts principle is used to:
  A)
  Solve static problems done clear
  B)
  Solve kinematics problems done clear
  C)
  Convert dynamic problems into equivalent static problems done clear
  D)
  Solve elasticity problems done clear
  View Solution play_arrow

• question_answer17)
  An elevator weighing 10 kN attains an upward velocity of 5 m/s in 2s with uniform acceleration. The tension in the supporting rope is:
  A)
  3.75 kN             done clear
  B)
  625 kN done clear
  C)
  7.45 kN             done clear
  D)
  1, 2.55 kN done clear
  View Solution play_arrow

• question_answer18)
  The first law of motion provides the definition of:
  A)
  Momentum                    done clear
  B)
  Force done clear
  C)
  Acceleration                   done clear
  D)
  Energy done clear
  View Solution play_arrow

• question_answer19)
  A mass m is initially in the rest position. A constant force is applied on it. The velocity acquired by it in given displacement will he directly proportion al to:
  A)
  \[\sqrt{m}\]                                done clear
  B)
  \[1\sqrt{m}\] done clear
  C)
  \[m\]                             done clear
  D)
  \[1\,m\] done clear
  View Solution play_arrow

• question_answer20)
  Consider the following statements:

  1. Forced circulation is always used in high pressure power boilers.

  2. Soot blowers are used for cleaning tube surfaces at regular intervals.

  3. Electrostatic precipitator is used to remove fly ash from flue gases.

  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_answer21)
  Which one of the following statements is correct?
  A)
  Energy and work are scalars done clear
  B)
  Force and work are vectors done clear
  C)
  Energy, momentum and velocity are vectors done clear
  D)
  Force, momentum and velocity are scalars. done clear
  View Solution play_arrow

• question_answer22)
  A block of weight 2 N falls from a height of 1 m on the top of a spring. If the spring gets compressed by 1 m to bring the weight momentarily to rest, then the spring constant would be:
  A)
  50 N/m              done clear
  B)
  100 N/m done clear
  C)
  200 N/m                        done clear
  D)
  400 N/m done clear
  View Solution play_arrow

• question_answer23)
  A person, carrying on his head a jewellery box of weight W jumped down from the third story of a building. Before touching the ground, he will feel a load of magnitude:
  A)
  Zero                              done clear
  B)
  \[\frac{W}{2}\] done clear
  C)
  W                                 done clear
  D)
  infinity done clear
  View Solution play_arrow

• question_answer24)
  A box rests in the rear of a truck moving with a deceleration of \[2\,\,\text{m/}{{\text{s}}^{\text{2}}}.\] To prevent the box from sliding, the approximate value of static coefficient of friction between the box and the bed of the truck should be:
  A)
  0.1                                done clear
  B)
  0.2 done clear
  C)
  0.3                                done clear
  D)
  0.4 done clear
  View Solution play_arrow

• question_answer25)
  Two particles of same mass are moving with same speed on circular paths of radii r, and \[{{r}_{2}}.\] The ratio of their centripetal forces would be:
  A)
  \[{{r}_{2}}/{{r}_{1}}\]             done clear
  B)
  \[\sqrt{({{r}_{2}}/{{r}_{1}})}\] done clear
  C)
  \[{{({{r}_{2}}/{{r}_{1}})}^{2}}\]                    done clear
  D)
  \[{{({{r}_{1}}/{{r}_{2}})}^{2}}\] done clear
  View Solution play_arrow

• question_answer26)
  A wheel of mass m and radius r is in accelerated rolling motion without slip under a steady axle torque T. If the coefficient of kinetic friction is m, the friction from the ground on the wheel is:
  A)
  \[\mu mg\]                     done clear
  B)
  T/r done clear
  C)
  Zero                              done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer27)
  The centripetal force on a vehicle rounding a curve on a level track is provided by:
  A)
  Gravity done clear
  B)
  Friction between the tress and the track done clear
  C)
  The torque applied to its steering wheel done clear
  D)
  Its brakes done clear
  View Solution play_arrow

• question_answer28)
  A stone of mass m at the end of a string of length \[l\] is whirled in a vertical circle at a constant speed. The tension in the string will be maximum when the stone is:
  A)
  At the top of the circle done clear
  B)
  Half way down from the top done clear
  C)
  quarter Way down from the top done clear
  D)
  At the bottom of the circle done clear
  View Solution play_arrow

• question_answer29)
  The output of a boiler is normally stated as:
  A)
  Evaporative capacity in tonnes of steam that can he produced from and at \[100{}^\circ C\] done clear
  B)
  Weight of steam actually produced at rated pressure in tonnes per hour done clear
  C)
  Boiler horse power done clear
  D)
  Weight of steam produced per kg of fuel done clear
  View Solution play_arrow

• question_answer30)
  Match List-I with List-II and select the correct answer using the codes given below the lists.

  List-I		List-II
  A.	Bin system	1.	Dust collection
  B.	lone furnace	2.	High turbulence
  C.	Tangential burners	3.	Highslag recovery
  D.	Scrubber	4.	Pulverised fuel

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

• question_answer31)
  Match List-I (turbines) with List-II (classification) and select the correct answer using the codes given below the list:

  List-I		List-II
  A.	Parson's	1.	Pressure compounded
  B.	De Laval	2.	Reaction
  C.	Rateau	3.	Simple impulse
  D.	Curtis	4.	Velocity compounded

  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\[\to \]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_answer32)
  A thin circular ring of mass M and radius R is rotating about it axis with a constant angular velocity \[\omega .\] Two objects each of mass m are attached gently to the opposite ends of a diameter of the ring. The wheel now rotates with an angular velocity of:
  A)
  \[\frac{\omega M}{M+m}\]                     done clear
  B)
  \[\frac{\omega (M+2M)}{M}\] done clear
  C)
  \[\frac{\omega (M+2m)}{M+2m}\]                      done clear
  D)
  \[\frac{\omega M}{M+2m}\] done clear
  View Solution play_arrow

• question_answer33)
  A ballet of mass 1 kg is fired with a velocity of u m/s from a gun of mass 10 kg. The ratio of kinetic energies of bullet and gun is:
  A)
  10                                 done clear
  B)
  11 done clear
  C)
  1.1                                done clear
  D)
  0.1 done clear
  View Solution play_arrow

• question_answer34)
  Two masses, 2 kg and 8 kg, are moving with equal kinetic energy. The ratio of magnitudes of their momentum is:
  A)
  0.25                              done clear
  B)
  0.50 done clear
  C)
  0.625                done clear
  D)
  1.00 done clear
  View Solution play_arrow

• question_answer35)
  A mass M is moving with a constant velocity parallel to jr-axis. It angular momentum with respect to the origin:
  A)
  Is zero               done clear
  B)
  remains constant done clear
  C)
  Goes on increasing done clear
  D)
  goes on decreasing. done clear
  View Solution play_arrow

• question_answer36)
  A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved?
  A)
  Momentum alone done clear
  B)
  Kinetic energy along done clear
  C)
  Momentum and kinetic energy both done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer37)
  Two balls at same temperature collide. What is conserved?
  A)
  Temperature                   done clear
  B)
  velocity done clear
  C)
  Kinetic energy     done clear
  D)
  momentum done clear
  View Solution play_arrow

• question_answer38)
  For perfectly elastic bodies the value of the coefficient of restitution is:
  A)
  Zero                              done clear
  B)
  0.372 done clear
  C)
  0.500                done clear
  D)
  1.000 done clear
  View Solution play_arrow

• question_answer39)
  A jet engine works on the principle of:
  A)
  Conservation of energy done clear
  B)
  Conservation of linear momentum done clear
  C)
  Conservation of mass done clear
  D)
  Conservation of mass and momentum. done clear
  View Solution play_arrow

• question_answer40)
  A ball falls from a height of 1 m, hits the ground and rebounds with half its velocity just before impact Then after rising it falls and hits the ground and again rebounds with half its velocity just before impact, and so on. The total distance travelled by the ball till it comes to rest on the ground is:
  A)
  2 m                               done clear
  B)
  5/3 m done clear
  C)
  4/3 m                done clear
  D)
  5/4 m done clear
  View Solution play_arrow

• question_answer41)
  A ball A of mass m falls under gravity from a height h and strikes another ball B of mass m which is supported at rest on a spring of stiffness k. Assume perfectly elastic impact. Immediately after the impact:
  A)
  The velocity of ball A is (1/2) \[\sqrt{2}\,\,gh\] done clear
  B)
  The velocity of ball A is zero done clear
  C)
  The velocity of both balls is (1/2) \[\sqrt{2}\,\,gh\] done clear
  D)
  None of the above. done clear
  View Solution play_arrow

• question_answer42)
  A bullet enters a plank of 30 mm thickness with a velocity of 100 m/s and emerges out from the plank with a velocity of 50 m/s. What is the minimum thickness of the plank so that the bullet remain embedded in the plank:                       
  A)
  100 mm            done clear
  B)
  80 mm            done clear
  C)
  60 mm              done clear
  D)
  40 mm          done clear
  View Solution play_arrow

• question_answer43)
     The outward radial flow turbine in which there are two rotors rotating in opposite directions is known as:
  A)
  50% reaction radial turbine                  done clear
  B)
  Cantilever turbine                            done clear
  C)
  Lungstrom turbine                        done clear
  D)
  pass-out turbine    done clear
  View Solution play_arrow

• question_answer44)
                        A train of weight \[200\times {{10}^{4}}N\] is running on  horizontal track at a constant speed of 10 m/s, overcoming a constant frictional force of \[200\,\,\times \,\,10\,N.\] What is the power of the engine drinking the train
  A)
  800 kW             done clear
  B)
  1200 kW                            done clear
  C)
  200 kW             done clear
  D)
  400 kW         done clear
  View Solution play_arrow

• question_answer45)
                                             The power required by a machine having an efficiency of 80% for raising a load of 24 N through a distance of 36 m in 1 minutes is:                      
  A)
  12 W                 done clear
  B)
  18 W             done clear
  C)
  50 W                 done clear
  D)
  450 W        done clear
  View Solution play_arrow

• question_answer46)
      A car of mass 2000 kg is traveling at a constant speed of 50 m/s. The car has to resist a wind drag \[{{F}_{D}}=10v(N),\] Where v is the velocity of the car in m/s. The power required by the engine is:      
  A)
  5 kW                 done clear
  B)
  10 kW           done clear
  C)
  25 kW               done clear
  D)
  30 kW           done clear
  View Solution play_arrow

• question_answer47)
  When compared to stable flow, for supersaturated flow of steam through a nozzle the available enthalpy drop:
  A)
  Remains the same           done clear
  B)
  increases done clear
  C)
  Decreases                       done clear
  D)
  is unpredictable. done clear
  View Solution play_arrow

• question_answer48)
  A man is pulling a bucket of water up to the roof of a building of 6 m height. The total weight of the rope is 20 N and the weight of the bucket with water is 100 N. The work done by the man is:
  A)
  720 N-m                        done clear
  B)
  420 N-m done clear
  C)
  660 N-m                        done clear
  D)
  600 N-m done clear
  View Solution play_arrow

• question_answer49)
  A train of weight 5000 kN is pulled on a level track with a constant speed of 10 m/s. The frictional force is 75 kN. The power of the engine is:
  A)
  375 kW             done clear
  B)
  750 kW done clear
  C)
  1875 kW                        done clear
  D)
  3000 kW done clear
  View Solution play_arrow

• question_answer50)
  A mechanical system can be said to be conservative if the:
  A)
  Potential energy of the system remains constant done clear
  B)
  Kinetic energy of the system remains constant done clear
  C)
  Sum of the kinetic and potential energies remains constant done clear
  D)
  Linear momentum remains constant done clear
  View Solution play_arrow

• question_answer51)
  If the kinetic energy of the body becomes four times its initial value then the new:
  A)
  Three times its initial value done clear
  B)
  Four times its initial value done clear
  C)
  Twice the initial value done clear
  D)
  Unchanged done clear
  View Solution play_arrow

• question_answer52)
  A man throws bricks to a height of 12 m where they reach with a speed of 12 m/s. If he throws the bricks such that they just reach that height. What percentage of energy will he save?
  A)
  19%                              done clear
  B)
  26% done clear
  C)
  38%                              done clear
  D)
  57% done clear
  View Solution play_arrow

• question_answer53)
  A cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of g/4. Then the work done by the cord on the block is:
  A)
  \[Mgd/4\]                       done clear
  B)
  \[3\,Mgd/4\] done clear
  C)
  \[-\,3\,Mgd/4\]                 done clear
  D)
  \[Mgd\] done clear
  View Solution play_arrow

• question_answer54)
  A uniform chain of length L and mass M lying on a smooth table such that one third of its length is hanging vertically down over the edge of the table. If g is the acceleration due to gravity, the work required to pull the hanging part on to the table is:
  A)
  MgL                              done clear
  B)
  MgL/3 done clear
  C)
  MgL/9               done clear
  D)
  MgL/18 done clear
  View Solution play_arrow

• question_answer55)
  A cage with a parrot sitting in it is suspended from a spring balance. The parrot starts flying. The reading of the spring balance will:
  A)
  Increase             done clear
  B)
  decrease done clear
  C)
  No change                     done clear
  D)
  be zero done clear
  View Solution play_arrow

• question_answer56)
  The principle of conservation of energy cannot be applied in case of:
  A)
  A particle moving in gravitational field done clear
  B)
  Flow of heat through a metal done clear
  C)
  Ideal flow of water in a pipe done clear
  D)
  Sliding of a particle along inclined plane with friction. done clear
  View Solution play_arrow

• question_answer57)
  The law of conservation of mechanical energy is valid:
  A)
  Irrespective of the mature of force held done clear
  B)
  In gravitational field done clear
  C)
  Only if the total work done by the particle in moving around in a closed trajectory is zero done clear
  D)
  Only if the force is tangential to the trajectory. done clear
  View Solution play_arrow

• question_answer58)
  A wound watch spring possesses energy stored in the form of:
  A)
  Kinetic energy                        done clear
  B)
  Potential energy done clear
  C)
  Mechanical potential energy done clear
  D)
  Mechanical kinetic energy done clear
  View Solution play_arrow

• question_answer59)
  The total energy of a stone thrown up will be maximum at:
  A)
  The ground level done clear
  B)
  the highest point done clear
  C)
  Middle of the path           done clear
  D)
  all heights done clear
  View Solution play_arrow

• question_answer60)
  Which of the following cannot be increased by using an appropriate machine?
  A)
  Force                 done clear
  B)
  torque done clear
  C)
  Velocity             done clear
  D)
  work done clear
  View Solution play_arrow

• question_answer61)
  When two bodies stick together after collision, the collision is said to be:
  A)
  Perfectly elastic   done clear
  B)
  partially elastic done clear
  C)
  Completely inelastic        done clear
  D)
  plastic done clear
  View Solution play_arrow

• question_answer62)
  A particle of mass m has momentum p. Its kinetic energy is:
  A)
  \[\text{mp}\]                              done clear
  B)
  \[{{p}^{2}}m\] done clear
  C)
  \[{{\text{p}}^{\text{2}}}\text{/m}\]                  done clear
  D)
  \[{{\text{p}}^{\text{2}}}\text{/(2m)}\] done clear
  View Solution play_arrow

• question_answer63)
  When a mass is rotating in a plane about a fixed point, its angular momentum is directed along:
  A)
  The radius done clear
  B)
  The tangent to the orbit done clear
  C)
  A line perpendicular to the plane of rotation done clear
  D)
  None of the above. done clear
  View Solution play_arrow

• question_answer64)
  A body moves down a smooth inclined plane and if same body is dropped vertically down from the same height as that of the inclined plane top, then following parameters on reaching the ground will be same:
  A)
  Velocity             done clear
  B)
  Momentum done clear
  C)
  Kinetic energy     done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer65)
  What is the work done if a bucket of water weighing 10 N is pulled up from a well 20 m deep by a rope weighing 1 N/m?
  A)
  200 N-m                        done clear
  B)
  400 N-m done clear
  C)
  500 N-m                        done clear
  D)
  600 N-m done clear
  View Solution play_arrow

• question_answer66)
  In the case of a flywheel of mass moment of intertia 'I' rotating at an angular velocity \[\omega \] the expression \[\frac{1}{2}\,I{{\omega }^{2}}\] represents the:
  A)
  Centrifugal force done clear
  B)
  angular momentum done clear
  C)
  Torque              done clear
  D)
  Kinetic energy done clear
  View Solution play_arrow

• question_answer67)
  Which of the following statements are correct?

  (1) Impulse turbine rotor blades are thick at the Centre.

  (2) Rateau turbine is more efficient than Curtis turbine.

  (3) Blade velocity coefficient for an impulse turbine is of the order of 60%.

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

• question_answer68)
  A circular disc rolls without slip on an inclined plane. The ratio of its rotational kinetic energy to the total energy is:
  A)
  \[\frac{1}{4}\]                           done clear
  B)
  \[\frac{1}{2}\] done clear
  C)
  \[\frac{1}{3}\]                           done clear
  D)
  \[\frac{2}{3}\] done clear
  View Solution play_arrow

• question_answer69)
  A tapering bar (diameters of end sections being \[{{d}_{1}}\] and\[{{d}_{2}}\]) and a bar of uniform cross-section ?d? have the same length and are subjected to the same axial pull. Both the bars will have the same extension if ?d' is equal to:
  A)
  \[\frac{{{d}_{2}}+{{d}_{2}}}{2}\]                   done clear
  B)
  \[\sqrt{{{d}_{1}}{{d}_{2}}}\] done clear
  C)
  \[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\]                        done clear
  D)
  \[\sqrt{\frac{{{d}_{1}}+{{d}_{2}}}{2}}\] done clear
  View Solution play_arrow

• question_answer70)
  The number of independent elastic constants required to express the stress strain relationship for a linearly elastic isotropic materials is:
  A)
  One                              done clear
  B)
  Two done clear
  C)
  Three                done clear
  D)
  Four done clear
  View Solution play_arrow

• question_answer71)
  The deformation of a bar under its own weight as compared to that when subjected to a direct axial load equal to its own weight will be:
  A)
  The same                       done clear
  B)
  One-fourth done clear
  C)
  Half                              done clear
  D)
  Double done clear
  View Solution play_arrow

• question_answer72)
  The critical pressure ratios for flow of dry saturated and superheated steam through a nozzle are respectively:
  A)
  0.5279 and 0.550           done clear
  B)
  0577 and 0.550 done clear
  C)
  0.577 and 0.546 done clear
  D)
  0.5279 and 0.546 done clear
  View Solution play_arrow

• question_answer73)
  Given that a = nozzle angle, n = number of rows of moving blades in a velocity compounded. Impulse turbine, the optimum blade speed ratio is:
  A)
  \[2\cos {{\alpha }_{1}}n\]                      done clear
  B)
  \[\frac{n\cos {{\alpha }_{1}}}{2}\] done clear
  C)
  \[\frac{\cos {{\alpha }_{1}}}{2(n+1)}\]               done clear
  D)
  \[\frac{\cos {{\alpha }_{1}}}{2n}\] done clear
  View Solution play_arrow

• question_answer74)
  In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and the rotor blade exit angle is 30". For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the stator  will be:                                         
  A)
  \[640/\sqrt{3}\,\text{m/s}\]                      done clear
  B)
  640 m/s done clear
  C)
  \[320/\sqrt{3}\,\text{m/s}\]                      done clear
  D)
  \[160/\sqrt{3}\,\text{m/s}\] done clear
  View Solution play_arrow

• question_answer75)
  For a free vortex design of blade in the rotor of a reaction axial turbine, the specific work along the blade height is:                                
  A)
  Higher at the blade hub and lower at the blade tip done clear
  B)
  Constant from huh to tip                   done clear
  C)
  Lower at the hub and tip but different from the mean section                              done clear
  D)
  Same at the hub and tip but different from the mean section.  done clear
  View Solution play_arrow

• question_answer76)
                           Two hollow shafts of the same material have the same length and outside diameter. Shaft 1 has internal diameter equal to one-third of the outer diameter and shaft 2 has internal diameter equal to half of the outer diameter. If both the shafts are subject to the same torque, the ratio of their twists \[{{\theta }_{1}}/{{\theta }_{2}}\] will be equal  to:                                         
  A)
  16/81                done clear
  B)
  8/27                                                                 done clear
  C)
  19/27                done clear
  D)
  243/256           done clear
  View Solution play_arrow

• question_answer77)
                                                      A simply supported beam of constant flexural rigidity and length 2 L carries a concentrated load 'P' at its mid-span and the deflection under that load is \[\delta .\] if a cantilever beam of the same flexural rigidity length is subjected to load ?P? at its free end, them the deflection at the free end will be:           
  A)
  \[1/2\delta \]                   done clear
  B)
  \[\delta \] done clear
  C)
  \[2\delta \]                                  done clear
  D)
  \[4\delta \] done clear
  View Solution play_arrow

• question_answer78)
  A solid shaft of diameter 100 mm, length 1000 mm is subjected to a twisting moment ?T? The maximum shear stress developed in the shaft is 60 N/mm. A hold of 50 mm diameter is now drilled throughout the length of shaft. To develop a maximum shear stress of 60 N/ mm in the hollow shaft, the torque ?T? must he reduced by:                             
  A)
  T/4                               done clear
  B)
  T/8             done clear
  C)
  T/12                              done clear
  D)
  T/16   done clear
  View Solution play_arrow

• question_answer79)
           A circular shaft is subjected to the combined action of bending, twisting and direct axial loading. The maximum bending stress \[\sigma \] maximum shearing stress \[\sqrt{3\sigma }\] and a uniform axial stress \[\sigma \](compressive) are produced. The  \[\sigma \] maximum compressive normal stress produced in the shaft will be:               
  A)
  3\[\sigma \]                                done clear
  B)
  2\[\sigma \]          done clear
  C)
  \[\sigma \]                                  done clear
  D)
  Zero    done clear
  View Solution play_arrow

• question_answer80)
         Two closed-coil springs are made from the same small diameter wire, one wound on 2.5 cm diameter core and the other on 1.25 cm diameter core. If each spring has V coils, then the ratio of their spring constants would be:
  A)
  1/16                              done clear
  B)
  1/8 done clear
  C)
  1/4                                done clear
  D)
  ½ done clear
  View Solution play_arrow

• question_answer81)
  A reaction turbine stage has angles a, \[\alpha ,\]\[\beta ,\]\[\gamma \]as nozzle angle, inlet blade and outlet blade angle respectively. The expression for maximum efficiency of the turbine is given by:
  A)
  \[\frac{2{{\cos }^{2}}\beta }{1+{{\cos }^{2}}\beta }\]             done clear
  B)
  \[\frac{2{{\cos }^{2}}\gamma }{1+{{\cos }^{2}}\gamma }\] done clear
  C)
  \[\frac{2{{\cos }^{2}}\alpha }{1+{{\cos }^{2}}\alpha }\]                     done clear
  D)
  \[\frac{\cos (\alpha +\beta )}{{{\cos }^{2}}\gamma }\] done clear
  View Solution play_arrow

• question_answer82)
  Consider the following

  1. Safety valve.

  2. Steam trap

  3. Steam separator

  4. Economiser.

  Among these the boiler accessories would" include:
  A)
  1, 2 and 3                      done clear
  B)
  2, 3 and 4 done clear
  C)
  1 and 4             done clear
  D)
  1, 2, 3 and 4 done clear
  View Solution play_arrow

• question_answer83)
  Circumferential stress in a cylindrical steel boiler shell under internal pressure is 80 MPa, Young's modulus of elasticity and Poisson's ratio are respectively \[2\,\,\times \,\,{{10}^{5}}\] MPa and 0.28. The magnitude of circumferential strain in the boiler shell will be:
  A)
  \[3.44\times {{10}^{-\,4}}\]                   done clear
  B)
  \[3.84\times {{10}^{-\,4}}\] done clear
  C)
  \[4\times {{10}^{-\,4}}\]                       done clear
  D)
  \[4.56\times {{10}^{-\,4}}\] done clear
  View Solution play_arrow

• question_answer84)
  The state of plane stress in a plate of 100 mm thickness is given as

  \[{{\sigma }_{x\,x}}=100\,\,\text{N/m}{{\text{m}}^{\text{2}}},\] \[{{\sigma }_{x\,y}}=200\,\,\text{N/m}{{\text{m}}^{\text{2}}},\]

  Young's modulus \[=300\,\,\text{N/m}{{\text{m}}^{\text{2}}}\]

  Poission?s ratio = 0.3

  The stress developed in the direction of thickness is

  A)
  Zero                              done clear
  B)
  \[90\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] done clear
  C)
  \[100\,\,\text{N/m}{{\text{m}}^{\text{2}}}\]                 done clear
  D)
  \[200\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer85)
  The number of elastic constants for a completely anisotropic elastic material which follows Hooks laws is
  A)
  3                                  done clear
  B)
  4 done clear
  C)
  21                                 done clear
  D)
  25 done clear
  View Solution play_arrow

• question_answer86)
  The bending moment equation, as a function of distance x measured from the left end, for a simply supported beam of span. L m carrying a uniformly distributed load of intensity w N/m will be given by:
  A)
  \[M=\text{wL/2}\,\,(L-x)-\text{W/2}\,\,(L-x)N.m\] done clear
  B)
  \[M=\text{wL/2}x-\text{w}{{x}^{\text{2}}}\text{/2}-N.m\] done clear
  C)
  \[M=\text{wL/2}\,\,{{(L-x)}^{2}}-\text{w/2}\,\,(L-x)-N.m\] done clear
  D)
  \[M=\text{w}{{x}^{\text{2}}}\text{/2}-\text{wL}x\text{/2}N.m\] done clear
  View Solution play_arrow

• question_answer87)
  A rod of material with \[E=200\times {{10}^{3}}\] MPa and \[\propto ={{10}^{-\,3}}mm/mm{}^\circ C\] is fixed at both the ends. It is uniformly heated such that the increase in temperature is \[30{}^\circ C.\] the stress, developed in the rod is:
  A)
  \[6000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\](Tensile) done clear
  B)
  \[6000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] (Compressive) done clear
  C)
  \[2000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] (Tensile) done clear
  D)
  \[2000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] (Compressive) done clear
  View Solution play_arrow

• question_answer88)
  Two beams of equal cross-sectional area arc subjected to equal bending moment. If one beam has square cross-section and the other has circular section, then
  A)
  Both beams will be equally strong done clear
  B)
  Circular section beam will be stronger done clear
  C)
  Square section beam will be stronger done clear
  D)
  The strength of the beam will depend on the nature of loading done clear
  View Solution play_arrow

• question_answer89)
  A cantilever beam of rectangular cross-section is subjected to a load W at its free end. If the depth of the beam is doubled and the load is halved, the deflection of the free end as compared to original deflection will be:
  A)
  Half                              done clear
  B)
  One-eighth done clear
  C)
  One-sixteenth     done clear
  D)
  Double done clear
  View Solution play_arrow

• question_answer90)
  The degree of reaction of a turbine is defined as the ratio of:
  A)
  Static pressure drop to total energy transfer done clear
  B)
  Total energy transfer to static pressure drop. done clear
  C)
  Change of velocity energy across the turbine to the total energy transfer. done clear
  D)
  Velocity energy to pressure energy. done clear
  View Solution play_arrow

• question_answer91)
  A solid circular shaft is subjected to pure torsion. The ratio of maximum shear stress to maximum normal stress at any point would be
  A)
  1 : 1                              done clear
  B)
  1 : 2 done clear
  C)
  2 : 1                              done clear
  D)
  2 : 3 done clear
  View Solution play_arrow

• question_answer92)
  A short column of external diameter D and internal diameter d carries an eccentric load d. The greatest eccentricity which the load can have without producing tension on the cross-section of the column would be
  A)
  \[\frac{d+D}{8}\]                      done clear
  B)
  \[\frac{{{d}^{2}}+{{D}^{2}}}{8d}\] done clear
  C)
  \[\frac{{{d}^{2}}+{{D}^{2}}}{8D}\]             done clear
  D)
  \[\sqrt{\frac{{{d}^{2}}+{{D}^{2}}}{8}}\] done clear
  View Solution play_arrow

• question_answer93)
  A bar of length L and of uniform cross-section area A and second moment of area / is subjected to a pull P. If Young's modulus of elasticity of the bar material is E, the expression for strain energy stored in the bar will be:
  A)
  \[\frac{{{P}^{2}}L}{2AE}\]                 done clear
  B)
  \[\frac{P{{L}^{2}}}{2EI}\] done clear
  C)
  \[\frac{P{{L}^{2}}}{AE}\]                               done clear
  D)
  \[\frac{{{P}^{2}}L}{AE}\] done clear
  View Solution play_arrow

• question_answer94)
  If a thick cylindrical shell is subjected to internal pressure, then hoop stress, radial stress and longitudinal stress at a point in the thickness will be:
  A)
  Tensile, compressive and tensile respectively done clear
  B)
  All compressive done clear
  C)
  All tensile done clear
  D)
  Tensile, compressive and compressive respectively. done clear
  View Solution play_arrow

• question_answer95)
  A thin cylinder with both ends closed is subjected to internal pressure p. The longitudinal stress at the surface has been calculated as \[{{\sigma }_{0}}.\] Maximum shear stress at the surface will be equal to:
  A)
  \[2{{\sigma }_{0}}\]                              done clear
  B)
  \[1,\,5{{\sigma }_{0}}\] done clear
  C)
  \[{{\sigma }_{0}}\]                                done clear
  D)
  \[0.5{{\sigma }_{0}}\] done clear
  View Solution play_arrow

• question_answer96)
  The maximum shear occurs on the outermost fibres of a circular shaft under torsion. In a close coiled helical spring, the maximum shear stress occurs on the:
  A)
  Outermost fibres done clear
  B)
  Fibres at mean diameter done clear
  C)
  Innermost fibres done clear
  D)
  End coils done clear
  View Solution play_arrow

• question_answer97)
  A circular solid shaft is subjected to a bending moment of 400 kN.m and a twisting moment of 300 kN.m. On the basis of the maximum principal stress theory, the direct stress is \[\sigma \] and according to the maximum shear stress theory, the shear stress is t The ratio \[\sigma /t\] is:
  A)
  \[\frac{1}{5}\]                           done clear
  B)
  \[\frac{3}{4}\] done clear
  C)
  \[\frac{9}{5}\]                           done clear
  D)
  \[\frac{11}{6}\] done clear
  View Solution play_arrow

• question_answer98)
  Which one of the following pairs is not correctly matched?
  A)
  Fertile material.......U-233 done clear
  B)
  Atomic number........Number of protons. done clear
  C)
  Mass defect.........Binding energy done clear
  D)
  Cross-section ........Scattering done clear
  View Solution play_arrow

• question_answer99)
  The energy released during the fission of one atom of Uranium-235 in million electron vote is about:
  A)
  100                               done clear
  B)
  200 done clear
  C)
  300                               done clear
  D)
  400 done clear
  View Solution play_arrow

• question_answer100)
  For the same internal diameter, wall thickness, material and internal pressure, the ratio of maximum stress, induced in a thin cylindrical and in a thin spherical pressure vessel will be:
  A)
  2                                  done clear
  B)
  \[\frac{1}{2}\] done clear
  C)
  4                                  done clear
  D)
  \[\frac{1}{4}\] done clear
  View Solution play_arrow

• question_answer101)
  A company sells 14,000 units of its product. It has a variable cost of Rs. 15 per unit. Fixed cost Rs. 47,000 and the required profit is  Rs. 23,000.Per unit product price (in Rs.) will be:
  A)
  60                                 done clear
  B)
  40 done clear
  C)
  30                                 done clear
  D)
  20 done clear
  View Solution play_arrow

• question_answer102)
  The inventory carrying cost includes:         
  A)
  Expenditure incurred for payment of bills    done clear
  B)
  Placing an order                            done clear
  C)
  Receiving and inspecting                    done clear
  D)
  Obsolescence and depreciation. done clear
  View Solution play_arrow

• question_answer103)
             For a product, the direct labour cost is Rs. 5 and direct materials cost is Rs. 10. The annual cost of direct materials is expected to be Rs. 2,00,000 and the annual overhead to be absorbed is Rs. 1,20,000. The total cost of the product will be:                        
  A)
  Rs. 16                done clear
  B)
  Rs. 18            done clear
  C)
  Rs. 19                done clear
  D)
  Rs. 21           done clear
  View Solution play_arrow

• question_answer104)
  If Break-even point = Total fixed cost  \[\left( 1-\frac{Variable\text{ }cost\text{ }per\text{ }unit}{X} \right),\]Then X is the:     
  A)
  Overheads                     done clear
  B)
  price per unit    done clear
  C)
  Direct cost                      done clear
  D)
  materials cost   done clear
  View Solution play_arrow

• question_answer105)
  In the EOQ model, if the unit ordering cost is doubled, the EOQ
  A)
  Is halved                                   done clear
  B)
  Is doubled                               done clear
  C)
  Increase 1.414 times                    done clear
  D)
  Decrease 1.414 times.     done clear
  View Solution play_arrow

• question_answer106)
                Which one of the following does not form a part of the direct cost of a component?            
  A)
  Cost of special tooling used              done clear
  B)
  Cost of material used                   done clear
  C)
  Cost of material wasted                done clear
  D)
  Wages of the labour actually involved. done clear
  View Solution play_arrow

• question_answer107)
      Match List-I (Cost Element) with List-II (Type Cost and select the correct answer using the given below the lists:

  List-I (Cost Element)		List-II (Type of Cost)
  A.	Discount	1.	Ordering cost
  B.	Preparation of the machine for a product	2.	Material cost
  C.	Negotiations with vendors	3.	Set-up cost
  D.	Rent for the warehouse	4.	Carrying cost

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

• question_answer108)
                Which one of the following correctly represent the average inventory turnover ratio for raw materials?
  A)
  Annual sales/annual inventory         done clear
  B)
  Average working process volume/total production volume done clear
  C)
  Annual consumption average inventory done clear
  D)
  Volume of spare parts/total annual sale done clear
  View Solution play_arrow

• question_answer109)
  Dry flue gases with a composition of \[C{{O}_{2}}=10.4%,\]\[{{O}_{2}}=9.6\] and \[{{N}_{2}}=80%,\] indicate that:
  A)
  Excess air is used done clear
  B)
  Air is insufficient done clear
  C)
  Hydrogen is not present in the coal done clear
  D)
  Air is just sufficient done clear
  View Solution play_arrow

• question_answer110)
  Which one of the following analysis is not associated with inventory management?
  A)
  ABC                             done clear
  B)
  EOQ done clear
  C)
  AOQ                             done clear
  D)
  VED done clear
  View Solution play_arrow

• question_answer111)
  Out of the following listed below, which two items would you consider under category under ABC analysis: Annual Usage of items

  Items No.	Annual usage X 1000	Unit cost Rs.
  A	30	0.10
  B	300	0.15
  C	2	200.00
  D	60	0.10
  E	5	0.30
  F	300	0.10
  G	10	0.05
  H	7	0.10
  I	20	0.10
  J	5	0.20

  A)
  B and F             done clear
  B)
  C and E done clear
  C)
  E and J             done clear
  D)
  G and H. done clear
  View Solution play_arrow

• question_answer112)
  Match List-I with List-II and select the correct answer is using the codes given below the Lists:

  List-I (Elements of cost)		List-II (nature of cost)
  A.	Interest on capital	1.	Variable
  B.	Direct labour	2.	Semi-variable
  C.	Water and electricity	3.	Fixed

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

• question_answer113)
  There are two products A and B with the following characteristics:

  Product	Demand	Order cost (in Rs./order)	Holding cost (in Rs./unit)
  A	100	100	4
  B	400	100	1

  The economic order quantities (EOQ) of product A and B will be in the ratio of:
  A)
  1 : 1                              done clear
  B)
  1 : 2 done clear
  C)
  1 : 4                              done clear
  D)
  1 : 8 done clear
  View Solution play_arrow

• question_answer114)
  Classifying items in A, B and C categories for selective control in inventory managements is done by arranging items in the decreasing order of:
  A)
  Total inventory costs       done clear
  B)
  item value done clear
  C)
  Annual usage value         done clear
  D)
  item demand done clear
  View Solution play_arrow

• question_answer115)
  In inventory contorl theory, to economic order quantity (E.O.Q.) is:
  A)
  Average level of inventory done clear
  B)
  Optimum lot size done clear
  C)
  Lot size corresponding to break-even analysis done clear
  D)
  Capacity of a warehouse. done clear
  View Solution play_arrow

• question_answer116)
  Consider the following statements:

  1. ABC analysis is based on Pareto's principal

  2. FIFO and LIFO policies can be used for material valuation in materials management.

  3. Simulation can be used for inventory control.

  4. EOQ (Economic Order Quantity) formula ignores variations in demand pattern.

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

• question_answer117)
  Given that, \[\theta =\] procurement cost per order, D = number of units demanded per year, H = holding cost per unit per year, i = rate of interest, p = purchase prices per unit. The procurement quantity per order (Q) is given by:
  A)
  \[Q=\frac{2.\theta .D}{H+iP}\]               done clear
  B)
  \[Q=\sqrt{\frac{2.\theta .D}{iH+P}}\] done clear
  C)
  \[Q=\sqrt{\frac{2.\theta .D}{H+iP}}\]     done clear
  D)
  \[Q=\sqrt{\frac{2.\theta }{D(H+iP)}}\] done clear
  View Solution play_arrow

• question_answer118)
  Annual demand for a product costing Rs.100 Per piece is Rs.900. Ordering cost per order is Rs.100 and inventory holding cost is Rs.2 per unit per year. The economic size is:
  A)
  200                               done clear
  B)
  300 done clear
  C)
  400                               done clear
  D)
  500 done clear
  View Solution play_arrow

• question_answer119)
  Which of the following cost elements are considered while determining the Economic Lot Size for purchase?

  1. Inventory carrying cost

  2. Procurement cost

  3. Set up cost.

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

• question_answer120)
  Consider the following costs:

  1. Cost of inspection and return of goods

  2. Cost of obsolescence

  3. Cost of scrap

  4. Cost of insurance

  5. Cost of negotiation with suppliers.

  Which of these costs are related to inventory carrying cost?
  A)
  1, 2 and 3                      done clear
  B)
  1, 3 and 4 done clear
  C)
  2, 3 and 4                      done clear
  D)
  2, 4 and 5 done clear
  View Solution play_arrow