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Engineering Mechanics

Engineering Mechanics
The motion of a particle round a fixed axis is

Circular
Translatory
Rotary
Translatory as well as rotary

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Engineering Mechanics
Work done is said to be zero, when

Some force acts on a body, but displacement is zero
None of these
No force acts on a body but some displacement takes place
Either (A) or (B)

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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
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

Reversible
Ideal
None of these
Non-reversible

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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

3t² + 2t
6f - 8
6t² - 8t
6f - 4

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Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

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

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