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Theory of Machine

Theory of Machine
In a coupling rod of a locomotive, each of the four pairs is a ________ pair.

Sliding
Turning
Rolling
Screw

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Theory of Machine
Which of the following is an open pair?

Ball and socket joint
Journal bearing
Lead screw and nut
Cam and follower

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Theory of Machine
Whirling speed of the shaft is the speed at which

Shaft tends to vibrate in longitudinal direction
Torsional vibrations occur
Combination of transverse and longitudinal vibration occurs
Shaft tends to vibrate vigorously in transverse direction

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Theory of Machine
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

l₁l₂ = kG²
l₁ = kG
l₁l₂ = kG
l₂ = kG

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

4 fn
2 fn
fn/2
8 fn

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Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Surface contact
None of these
Body contact
Line or point contact

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