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Engineering Mechanics

Engineering Mechanics
If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys.

First
Third
None of these
Second

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Engineering Mechanics
The rate of doing work is known as

Potential energy
Power
None of these
Kinetic energy

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

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Engineering Mechanics
A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

3.0 cm
4.0 cm
5.0 cm
2.5 cm

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Engineering Mechanics
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

P = W (sinα + μcosα)
P = W tanα
P = W tan (α + φ)
P = W (cosα + μsinα)

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Engineering Mechanics
A screw jack used for lifting the loads is

A non-reversible machine
None of these
A reversible machine
An ideal machine

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