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Theory of Machine

Theory of Machine
A rotary internal combustion engine has __________ cylinders.

Six
Five
Seven
Four

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Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Force-closed pair
Higher pair
Self-closed pair
Lower pair

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Theory of Machine
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

2π qI
1/2π
(1/2π). √(q/I)
2π. √(q/I)

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Theory of Machine
The ratio of maximum fluctuation of speed to the mean speed is called

Coefficient of fluctuation of speed
Maximum fluctuation of speed
None of these
Fluctuation of speed

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Theory of Machine
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

m.ω².r (cosθ - sinθ)
(1 - c).m.ω².r (cosθ - sinθ)
m.ω².r sinθ
m.ω².r cosθ

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Theory of Machine
The velocity of a body moving with simple harmonic motion is __________ at the mean position.

None of these
Minimum
Zero
Maximum

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