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Engineering Mechanics

Engineering Mechanics
The velocity of a particle moving with simple harmonic motion is _________ at the mean position.

Zero
None of these
Maximum
Minimum

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Engineering Mechanics
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

t = 2u sin (α + β)/g cos β
t = 2u sin (α - β)/g cos β
t = g cos β/2u sin (α - β)
t = g cos β/2u sin (α + β)

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Engineering Mechanics
A redundant frame is also called __________ frame.

Imperfect
Perfect
None of these
Deficient

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Engineering Mechanics
The efficiency of a lifting machine is the ratio of

All of these
Output to the input
Mechanical advantage to the velocity ratio
Work done by the machine to the work done on the machine

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Engineering Mechanics
The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

mr²/2
mr²/6
mr²/8
mr²/4

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Engineering Mechanics
Moment of inertia of a circular section about an axis perpendicular to the section is

πd3/32
πd3/16
πd4/32
πd4/64

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