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This set of Theory of Machines Multiple Choice Questions & Answers (MCQs) focuses on Theory Of Machines Set 8

Q1 | Cam size depends upon
  • Pitch cricle
  • Cam operating speed
  • Base circle
  • Outer circle
  • Prime circle
Q2 | In a car transmission losses will be least in which gear?
  • Direct gear
  • Third gear
  • Second gear
  • First gear
  • Sperm
Q3 | Klein's construction is used to determine
  • Displacement of various parts
  • Velocity of various parts
  • Acceleration of various parts
  • Angular acceleration of various parts
  • None of the above
Q4 | A sphere of mass 100 kg moving at 10 m/s overtakes and collides with another sphere of mass 50 kg moving at 3 m/s in the same direction. If the impact is perfectly elastic, the velocity of two masses after impact will be
  • 6.67 m/s
  • Zero
  • 8.33 m/s
  • 3.33 m/s
  • 2 m/s
Q5 | Which of the following road offers maximum resistance to automobiles?
  • Loose sand
  • Well rolled gravel
  • Wood paving
  • Macadam
  • Sperm
Q6 | The mechanism used to enlarge or reduce moments for reproducing drawings to different scales is known as
  • Durograph
  • Graphometer
  • Pantograph
  • Clinograph
  • Trisquare
Q7 | The frictional torque transmitted by a cone clutch is the same as that of
  • flat collar bearing
  • conical pivot bearing
  • truncated conical pivot bearing
  • None of the above
  • None of the above
Q8 | Froude's dynamometer is
  • Torsion dynamometer
  • Fan type dynamometer
  • Vortex type hydraulic dynamometer
  • Mechanical friction type dynamometer
  • Transmission type of dynamometer
Q9 | In vibration analysis 'Beat' frequency is
  • The frequency at which vibrations of a system are damped
  • Said to occur when two vibrations of almost equal frequency are present
  • The frequency when a system exceeds the vibrations frequency from the critical value
  • The frequency below which vibrations do not cause appreciable damage to equipment
  • One at which the vibrations of a system act exactly opposite to the other thereby causing damping
Q10 | In case of Scotch Yoke Mechanism the Coriolis component is
  • Involved but generally neglected
  • Not involved
  • Involved if some other conditions are satisfied
  • Sometimes involved
  • Involved
Q11 | A 0.5 kg weight attached to a light spring elongates it 0.981 mm. The natural frequency of the system would be approximately
  • 26 cps
  • 21 cps
  • 6 cps
  • 16 cps
  • 11 cps
Q12 | A vibrating system is said to be stable if
  • The amplitude of vibration decreases with time
  • The amplitude of vibration does not change with time
  • Only transient increases indefinitely with time
  • The total energy in the system does not change with time
  • None of the above
Q13 | The cam angle is
  • The angle of rotation of the cam for a definite displacement of the follower
  • Angle subtended by live portion of cam at the cam centre
  • The angle subtended at the cam centre by the portion of cam during which the follower moves
  • The angle subtended by the cam at the cam centre when the follower dwells
  • None of the above
Q14 | The coefficient of friction between pulley and belt is reduced to half. If the initial ratio of tension in belt is 5, then the new value will be
  • 2
  • 4
  • 5
  • 7.5
  • None of the above
Q15 | In a system if the speed reduction of 60 : 1 is desired the convenient way is to use
  • Helical gears
  • Worm and worm wheel
  • Differential system
  • Bevel gears
  • Simple gear train
Q16 | Which of following gear system have minimum axial thrust?
  • Double helical gears
  • Bevel gears
  • Spur gears
  • Helical gears
  • Miter gears
Q17 | In Iocomotives, swaying couple is caused due to
  • Unbalanced part of the secondary forces acting at a distance between the line of stroke of the cylinders
  • Vertical unbalanced primary forces acting in the plane of the wheels
  • Vertical unbalanced primary forces acting in the plane of the wheels
  • Unbalanced parts of the primary forces acting at a distance between the line of stroke of the cylinders
  • Horizontal unbalanced primary forces acting in the plane of the wheel
Q18 | A governor is said to be isochronous when
  • The equilibrium ball radii is constant for a given speed
  • For each speed within the working range the ball weights occupy a definite specific position
  • There is only one radius of the governor weights for each equilibrium sped
  • There is only one equibilbrium speed which is constant for all radii of rotation of the bells within the working range
  • None of the above
Q19 | In a Hartnell governor if the stiffness of spring is increased the governor will
  • Become more sensitive
  • Become less sensitive
  • Remain unaffected as far sensitivity is concerned
  • Start hunting (E) Become isochronous
  • 21 cps
Q20 | In taper roller bearing the contact angle is
  • Between 12? and 15?
  • Between 15? and 20?
  • Between 1? and 3?
  • Between 5? and 10?
  • Zero
Q21 | Which of the following is a sliding pair?
  • Bolt and nut
  • Ball and socket joint
  • Belt and pulley
  • Cross-head and guides
  • None of the above
Q22 | A body having an initial velocity of 10 m/s moves 200 mm in 5 sec when a force of 20 kgf is applied to it. If the acceleration due to gravity is 9 m/s2 the weight of the body should be
  • 15 kg
  • 18.35 kg
  • 11 kg
  • 18.65 kg
  • 16.5 kg
Q23 | Which of the following is not a common section of V-belts
  • B
  • F
  • C
  • D
  • E
Q24 | The speed of gas turbine is usually
  • Same as natural frequency of vibrations
  • Below the natural frequency of vibrations
  • Well above the natural frequency of vibrations
  • Not connected with natural frequency of vibrations
  • None of the above
Q25 | The direction of Corioli's component of acceleration is
  • The direction of relative velocity vector for the two coincidental points rotated by 90? in the direction of the angular velocity of the rotation of the link
  • The direction of relative velocity vector for the two coincidental points rotated by 180? in the direction of the angular velocity of the rotation of the link
  • The direction of relative velocity vector for the two coincidental points in the direction directly opposite to that of angular velocity
  • The direction at right angles to that of relative angular velocity vector
  • None of the above