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

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

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

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Engineering Mechanics
The velocity ratio of a single purchase crab winch can be increased by

Increasing the number of teeth of the pinion
All of these
Increasing the length of the handle
Increasing the radius of the load drum

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Engineering Mechanics
In order to completely specify angular displacement by a vector, it must fix

Magnitude of angular displacement
All of these
Sense of angular displacement
Direction of the axis of rotation

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

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

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

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