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Engineering Mechanics

Engineering Mechanics
An ideal machine is one whose efficiency is

1
Between 80 and 90%
Between 70 and 80%
Between 60 and 70 %

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Engineering Mechanics
The friction experienced by a body, when in motion, is known as

Static friction
Rolling friction
Dynamic friction
Limiting friction

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Engineering Mechanics
The velocity ratio for the third system of pulleys is

2n - 1
2n
n
n²

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Engineering Mechanics
The velocity ratio of a single purchase crab winch can be increased by

Increasing the number of teeth of the pinion
Increasing the length of the handle
All of these
Increasing the radius of the load drum

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Engineering Mechanics
A particle inside a hollow sphere of radius r, having coefficient of friction µ can rest up to height of

r/3
r/A
r/2
0.134 r

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Engineering Mechanics
Coefficient of friction depends upon

Both (A) and (B)
None of these
Nature of surface only
Area of contact only

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MORE MCQ ON Engineering Mechanics

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