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Engineering Mechanics

Engineering Mechanics
The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of

0.8 r
0.7 r
0.6 r
0.5 r

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Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is

bd³/36
db³/12
db³/36
bd³/12

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Engineering Mechanics
If the body falls freely under gravity, then the gravitational acceleration is taken as

+8.9 m/s2
-9.8 m/s2
+9.8 m/s2
-8.9 m/s2

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tanα/tan (α + φ)
None of these
tan(α - φ)/tanα
tan(α + φ)/tanα

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Engineering Mechanics
In actual machines, mechanical advantage is _________ velocity ratio.

None of these
Equal to
Greater than
Less than

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Engineering Mechanics
The centre of gravity of an isosceles triangle with base (p) and sides (q) from its base is

(p² - q²)/4
(p² + q²)/4
[√(4p² - q²)]/6
(4p² - q²)/6

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