Mechanical Engineering - Engineering Mechanics

41. 

If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.

A. directly
B. inversely

Answer: Option A

Explanation:

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42. 

Non-coplaner non-concurrent forces are those forces which

A. meet at one point, but their lines of action do not lie on the same plane
B. do not meet at one point and their lines of action do not lie on the same plane
C. do not meet at one point but their lines of action lie on the same plane
D. none of the above

Answer: Option B

Explanation:

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43. 

The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplaner concurrent forces.

A. lie
B. do not lie

Answer: Option B

Explanation:

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44. 

A force while acting on a body may

A. change its motion
B. balance the forces, already acting on it
C. give rise to the internal stresses in it
D. all of these

Answer: Option D

Explanation:

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45. 

A screw jack used for lifting the loads is

A. a reversible machine
B. a non-reversible machine
C. an ideal machine
D. none of these

Answer: Option B

Explanation:

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