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Engineering Mechanics

Engineering Mechanics
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

30°
120°
90°
60°

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Engineering Mechanics
The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

2D/(d₁ - d₂)
D/(d₁ - d₂)
2D/(d₁ + d₂)
D/(d₁ + d₂)

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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.

Less than
Equal to
None of these
Greater than

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Engineering Mechanics
The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

2mr²/5
mr²/3
2mr²/3
3mr²/5

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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

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

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

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

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