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Engineering Mechanics

Engineering Mechanics
If the gravitational acceleration at any place is doubled, then the weight of a body will be

g
g/2
2g
√2.g

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

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

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Engineering Mechanics
The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

P = C - mW
P = m/W + C
P = mW - C
P = mW + C

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

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Engineering Mechanics
The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)

1/2π. √(gh/kG² + h²)
1/2π. √(kG² + h²/gh)
2π. √(kG² + h²/gh)
2π. √(gh/kG² + h²)

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