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Theory of Machine

Theory of Machine
The lead screw of a lathe with nut forms a

Screw pair
Sliding pair
Rolling pair
Turning pair

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Theory of Machine
The Coriolis component of acceleration acts

At 45° to the sliding surface
Along the sliding surface
Perpendicular to the sliding surface
Parallel to the sliding surface

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Theory of Machine
The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.

Double
One-third
Two-third
Three times

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Theory of Machine
Critical damping is a function of

Mass and stiffness
Mass and natural frequency
Mass and damping coefficient
Damping coefficient and natural frequency

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Theory of Machine
A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

9,360 r.p.m.
6,000 r.p.m.
12,000 r.p.m.
5,367 r.p.m.

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Theory of Machine
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Damped vibration
Free vibration
Under damped vibration
Forced vibration

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