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Engineering Mechanics

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

n
n²
2n
2n - 1

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Engineering Mechanics
If a number of forces are acting at a point, their resultant will be inclined at an angle 'θ' with the horizontal, such that

tanθ = ΣH/ΣV
tanθ = ΣV/ΣH
tanθ = √(ΣV + ΣH)
tanθ = ΣV × ΣH

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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.

Cube root
None of these
Inversely proportional
Directly proportional

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

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

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Engineering Mechanics
The law of motion involved in the recoil of gun is

Newton's first law of motion
Newton's third law of motion
Newton's second law of motion
None of these

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Engineering Mechanics
The centre of percussion is below the centre of gravity of the body and is at a distance equal to

h × kG
h2/kG
kG2/h
h/kG

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