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Engineering Mechanics

Engineering Mechanics
A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is

20
40
5
10

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Engineering Mechanics
The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

2D/(d₁ - d₂)
2D/(d₁ + d₂)
D/(d₁ + d₂)
D/(d₁ - d₂)

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Zero at its upper end
Upwards at its upper end
Perpendicular to the wall at its upper end
Downwards at its upper end

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Engineering Mechanics
The maximum efficiency of a lifting machine is

1/(m × V.R.)
V.R./m
m/V.R.
1/m

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Engineering Mechanics
The velocity of a body on reaching the ground from a height h, is

√(gh)
√(2gh)
2g.√h
2.√(gh)

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Engineering Mechanics
The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

(1/2π). √(l/g)
(1/2π). √(g/l)
2π. √(l/g)
None of these

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