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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