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Engineering Mechanics

Engineering Mechanics
The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

Greater than
None of these
Less than
Equal to

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Neither reversible nor non-reversible machine
Reversible machine
Non-reversible machine
Ideal machine

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Engineering Mechanics
The velocity ratio of a single purchase crab winch can be increased by

Increasing the number of teeth of the pinion
Increasing the length of the handle
Increasing the radius of the load drum
All of these

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Engineering Mechanics
The total motion possessed by a body, is called

Impulsive force
Mass
Weight
Momentum

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG - Ah2
IP = Ah2 / IG
IP = IG / Ah2
IP = IG + Ah2

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Engineering Mechanics
The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)

2π × ω
2π/ω
π/ω
ω/2π

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