MECHANISM AND MACHINE MCQ based on gears , vibration, gear train, Governor etc.

Q.1 The critical speed of a rotating shaft depends upon ____.

A. Mass

B. Velocity

C. Mass and stiffness

D. Weight

Ans-: C

Q.2 Cam and follower is a _____ type of pair .

A. Close

B. Open

C. Linked

D. Loose

Ans-: B

Q.3 The rate of decay of oscillations is known as the ?

A. Damping coefficient

B. Critical damping

C. Logarithmic decrement

D. All of the above

Ans-: C

Q.4 Which of the following effect is more dangerous for a ship?

A. Waving

B. Pitching

C. Rolling

D. Steering

Ans-: B

Q.5 In forced vibrations the magnitude of damping force at resonance equals to ____.

A. Spring force

B. Zero

C. Infinite

D. Impressed force

Ans-: D

Q.6 In the steady state forced vibrations, the phase lag at resonance condition is _____.

A. 90 ° 

B. 0 °

C. 45 °

D. 180 °

Ans-: A

Q.7 In gears , the tip of the tooth of a mating gear digs into the portion between base and root circle then what type of effect is done.

A. Increase speed

B. Interference takes place

C. Gears move smoothly

D. None of the above

Ans-: B

Q.8 For underdamped vibrating system, the amplitude of vibration with reference to time .

A. Remain constant

B. Increases linearly

C. Decrease exponentially

D. None of the above

Ans-: C

Q.9 The ratio of actual damping coefficient to the critical damping coefficient is called the?

A. Damping factor

B. Transmissibility

C. Magnification factor

D. None of the above

Ans-: A

Q.10 The damping force is proportional to the velocity .

A. In forced vibration system

B. In underdamped vibration system

C. In damped vibration system

D. All of the above

Ans-: C