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

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Engineering Mechanics
Which of the following are vector quantities?

All of these
Linear acceleration
Linear velocity
Linear displacement

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Engineering Mechanics
In ideal machines, mechanical advantage is __________ velocity ratio.

Greater than
Less than
Equal to
None of these

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

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Engineering Mechanics
In actual machines, mechanical advantage is _________ velocity ratio.

Equal to
None of these
Less than
Greater than

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

2g
g
g/2
√2.g

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