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Engineering Mechanics

Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

m
1 - m
1 / m
1 + m

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Engineering Mechanics
The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is

100 N
20 N
None of these
500 N

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Engineering Mechanics
Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

None of these
20 N and 5 N
15 N and 5 N
15 N and 15 N

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Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is

bd³/12
db³/12
bd³/36
db³/36

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Neither reversible nor non-reversible machine
Ideal machine
Reversible machine
Non-reversible machine

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Engineering Mechanics
The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is

2mr²/5
7mr²/5
7mr²/3
2mr²/3

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