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Engineering Mechanics

Engineering Mechanics
The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is

D / d
D + d
D × d
D - d

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Downward at its upper end
Upward at its upper end
Towards the wall at its upper end
Away from the wall at its upper end

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

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Engineering Mechanics
The unit of work in S.I. units is

erg
joule
kg-m
Newton

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Engineering Mechanics
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base.

Six times
Nine times
Two times
Four times

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Engineering Mechanics
The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

ω.√(r² - y²)
ω².√(y² - r²)
ω.√(y² - r²)
ω².√(r² - y²)

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