Mechanical Engineering - Theory of machines

31. 

The gears are termed as medium velocity gears, if their peripheral velocity is

A. 1 - 3 m/s
B. 3 - 15 m/s
C. 15 - 30 m/s
D. 30 - 50 m/s

Answer: Option B

Explanation:

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32. 

For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a

A. 30° V-engine
B. 60° V-engine
C. 120° V-engine
D. 150° V-engine

Answer: Option A

Explanation:

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33. 

The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.

A. more than
B. less than
C. same as

Answer: Option B

Explanation:

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34. 

Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.

A. Right
B. Wrong

Answer: Option A

Explanation:

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35. 

The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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