Mechanical Engineering - Theory of machines

21. 

When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

A. lower pair
B. higher pair
C. self-closed pair
D. force-closed pair

Answer: Option A

Explanation:

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22. 

The centre distance between two meshing involute gears is equal to

A.
B.
C.
D.

Answer: Option A

Explanation:

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23. 

The two elements of a pair are said to form a __________ when they permit relative motion between them.

A. open pair
B. kinematic pair

Answer: Option B

Explanation:

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24. 

When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.

A. Right
B. Wrong

Answer: Option B

Explanation:

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25. 

In under damped vibrating system, the amplitude of vibration

A. decreases linearly with time
B. increases linearly with time
C. decreases exponentially with time
D. increases exponentially with time

Answer: Option C

Explanation:

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