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Engineering Mechanics

Engineering Mechanics
The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

2D/(D - d)
D/(D + d)
2D/(D + d)
D/(D - d)

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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

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

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Engineering Mechanics
The efficiency of a lifting machine is the ratio of

All of these
Work done by the machine to the work done on the machine
Output to the input
Mechanical advantage to the velocity ratio

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Engineering Mechanics
A couple produces

Combined translatory and rotational motion
Translatory motion
None of these
Rotational motion

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Engineering Mechanics
If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

None of these
g/3
g/4
g/2

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Engineering Mechanics
A pendulum which executes one beat per second is known as

Torsional pendulum
Compound pendulum
Simple pendulum
Second's pendulum

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