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Engineering Mechanics

Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

1 / m
1 + m
m
1 - m

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Engineering Mechanics
Centre of gravity of a solid cone lies on the axis at the height

One third of the total height above base
One-half of the total height above base
One fourth of the total height above base
Three eighth of the total height above the base

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Engineering Mechanics
The law of motion involved in the recoil of gun is

Newton's second law of motion
None of these
Newton's first law of motion
Newton's third law of motion

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

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

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tan(α + φ)/tanα
tanα/tan (α + φ)
tan(α - φ)/tanα
None of these

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Engineering Mechanics
A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

Upward at its upper end
Perpendicular to the wall at its upper end
Downward at its upper end
Zero at its upper end

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