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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

0.6 r
0.5 r
0.7 r
0.8 r

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Engineering Mechanics
The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

Equal to
Less than
None of these
Greater than

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Engineering Mechanics
A redundant frame is also called __________ frame.

Perfect
None of these
Deficient
Imperfect

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Engineering Mechanics
One joule is equal to

0.1 N-m
1 N-m
10 N-m
100 N-m

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

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

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Engineering Mechanics
The velocity ratio in case of an inclined plane inclined at angle 'θ' to the horizontal and weight being pulled up the inclined plane by vertical effort is

tanθ
cosθ
cosecθ
sinθ

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