Dynamics Of Machines Set 2

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This set of Dynamics of Machines Multiple Choice Questions & Answers (MCQs) focuses on Dynamics Of Machines Set 2

Q1 | For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then.
  • work is done by the gases
  • work is done on the gases
  • work is done on the piston wall
  • work is done by the piston wall
Q2 | In a punching press, which of the following quantity is constant?
  • load
  • torque
  • angular velocity
  • angle of rotation
Q3 | In a punching press, load is 0 at the time of punching.
  • true
  • false
Q4 | The maximum shear force required for punching depends on                  
  • sheared area
  • length of the plate
  • speed of the flywheel
  • total load
Q5 | A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.
  • 26.7 kn
  • 53.4 kn c) 13.35 kn d) 106.8 kn
Q6 | The relation between stroke punch s and radius of crank r is              
  • s=r
  • s=2r
  • s=4r
  • s=r/2
Q7 | If the stroke punch is 100mm, find the radius of the crank in mm.
  • 200
  • 100
  • 50 d) 400
Q8 | Energy during actual punching operation is same as the energy supplied by the motor.
  • true
  • false
Q9 | The balance energy required for punching is supplied by the flywheel by                  
  • increase in its kinetic energy
  • decrease in its kinetic energy
  • decrease in its potential energy
  • by variation of mass
Q10 | When the length of the connecting rod is unknown then the value (θ2 –θ1)/2π is equal to                  
  • t/s
  • t/2s
  • t/2r
  • t/r
Q11 | The size of a cam depends upon
  • base circle
  • pitch circle
  • prime circle
  • pitch curve
Q12 | The angle between the direction of the follower motion and a normal to the pitch curve is called
  • pitch angle
  • prime angle
  • base angle
  • pressure angle
Q13 | A circle drawn with centre as the cam centre and radius equal to the distance between the cam centre and the point on the pitch curve at which the pressure angle is maximum, is called
  • base circle
  • pitch circle
  • prime circle
  • none of the mentioned
Q14 | The cam follower generally used in automobile engines is
  • knife edge follower
  • flat faced follower
  • spherical faced follower
  • roller follower
Q15 | The cam follower extensively used in air- craft engines is
  • knife edge follower
  • flat faced follower
  • spherical faced follower
  • roller follower
Q16 | In a radial cam, the follower moves
  • in a direction perpendicular to the cam axis
  • in a direction parallel to the cam axis
  • in any direction irrespective of the cam axis
  • along the cam axis
Q17 | A radial follower is one
  • that reciprocates in the guides
  • that oscillates
  • in which the follower translates along an axis passing through the cam centre of rotation.
  • none of the mentioned
Q18 | Ofset is provided to a cam follower mechanism to
  • minimise the side thrust
  • accelerate
  • avoid jerk
  • none of the mentioned
Q19 | For low and moderate speed engines, the cam follower should move with
  • uniform velocity
  • simple harmonic motion
  • uniform acceleration and retardation
  • cycloidal motion
Q20 | For high speed engines, the cam follower should move with
  • uniform velocity
  • simple harmonic motion
  • uniform acceleration and retardation
  • cycloidal motion
Q21 | Which of the following displacement diagrams should be chosen for better dynamic performance of a cam-follower mechanism ?
  • simple hormonic motion
  • parabolic motion
  • cycloidal motion
  • none of the mentioned
Q22 | The linear velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by
  • ω(r1-r2)sinθ
  • ω(r1-r2)cosθ
  • ωr1+r2)sinθsec2θ
  • ω(r1+r2)cosθcosec2θ
Q23 | The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by
  • r(1-cosθ)
  • r(1-sinθ)
  • (r-r1)(1-cosθ)
  • (r-r1)(1-sinθ)
Q24 | The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by
  • ω2×oq
  • ω2×oqsinθ
  • ω2×oqcosθ
  • ω2×oqtanθ
Q25 | Centre of masses of the system lies on the axis of rotation.
  • 1, 2, 3 and 4
  • 1, 2, and 3 only
  • 2, 3 and 4 only
  • 1, 3 and 4 only