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Engineering Mechanics

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

2n
n²
2n - 1
n

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Engineering Mechanics
The centre of gravity of a uniform lamina lies at

The bottom surface
The centre of heavy portion
All of these
The midpoint of its axis

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Engineering Mechanics
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

Towards the wall at its upper end
Upwards at its upper end
Away from the wall at its upper end
Downwards at its upper end

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

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

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Engineering Mechanics
The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)

ω/2π
2π × ω
π/ω
2π/ω

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Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

bh3/36
bh3/12
bh3/4
bh3/8

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MORE MCQ ON Engineering Mechanics

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