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Engineering Mechanics

Engineering Mechanics
Coefficient of friction depends upon

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

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Engineering Mechanics
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

None of these
Non-reversible
Ideal
Reversible

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Engineering Mechanics
The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

Equal to
Greater than
Less than
None of these

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Engineering Mechanics
For a self locking machine, the efficiency must be

Less than 50%
Equal to 50%
1
Greater than 50%

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Engineering Mechanics
The total energy possessed by a system of moving bodies

Varies from point to point
Is minimum in the start and maximum at the end
Is constant at every instant
Is maximum in the start and minimum at the end

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Engineering Mechanics
When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration.

Directly proportional
Inversely proportional
Cube root
None of these

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