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Engineering Mechanics

Engineering Mechanics
A screw jack used for lifting the loads is

An ideal machine
A non-reversible machine
A reversible machine
None of these

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Engineering Mechanics
A particle moves along a straight line such that distance (x) traversed in 't' seconds is given by x = t² (t - 4), the acceleration of the particle will be given by the equation

6f - 4
6t² - 8t
3t² + 2t
6f - 8

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Engineering Mechanics
The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

2mr²/5
2mr²/3
mr²/3
3mr²/5

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Engineering Mechanics
The acceleration of a body sliding down an inclined surface is

None of these
g cosθ
g sinθ
g tanθ

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Engineering Mechanics
The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________ √(gra/h)

None of these
Equal to
Greater than
Less than

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Engineering Mechanics
The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

2n
2n - 1
n
n²

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