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Engineering Mechanics

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

mr²/3
3mr²/5
2mr²/3
2mr²/5

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

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

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Engineering Mechanics
Whenever a force acts on a body and the body undergoes a displacement, then

Power is being transmitted
None of these
Work is said to be done
Body has kinetic energy of translation

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Engineering Mechanics
The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is

75 mm
87.5 mm
50 mm
125 mm

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Engineering Mechanics
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W tan (α + φ)
P = W cos (α + φ)
P = W tan (φ - α)
P = W tan (α - φ)

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

Translatory as well as rotary
Rotary
Translatory
Circular

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MORE MCQ ON Engineering Mechanics

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