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Engineering Mechanics

Engineering Mechanics
Mass moment of inertia of a thin rod about its one end is ___________ the mass moment of inertia of the same rod about its mid-point

Four times
Same as
Thrice
Twice

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Engineering Mechanics
An ideal machine is one whose efficiency is

1
Between 70 and 80%
Between 80 and 90%
Between 60 and 70 %

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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

mr²/4
mr²/2
mr²/8
mr²/6

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Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as

Like parallel forces
Coplanar non-concurrent forces
Coplanar concurrent forces
Unlike parallel forces

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

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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.

Greater than
Equal to
None of these
Less than

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