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Engineering Mechanics

Engineering Mechanics
Moment of inertia of a circular section about its diameter (d) is

πd4/32
πd4/64
πd3/16
πd3/32

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Engineering Mechanics
Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

Upwards
Downwards
Horizontal
None of these

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Engineering Mechanics
The maximum efficiency of a lifting machine is

1/m
m/V.R.
V.R./m
1/(m × V.R.)

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Engineering Mechanics
Center of gravity of a thin hollow cone lies on the axis at a height of

One-half of the total height above base
One-fourth of the total height above base
One-third of the total height above base
Three-eighth of the total height above the base

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Engineering Mechanics
Concurrent forces are those forces whose lines of action

None of these
Meet at one point
Meet on the same plane
Lie on the same line

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Engineering Mechanics
The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is

16 cm4
12 cm4
9 cm4
20 cm4

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