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Theory of Machine

Theory of Machine
An automobile steering gear is an example of

Rolling pair
Lower pair
Sliding pair
Higher pair

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Theory of Machine
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

a is +ve and b is also +ve
a is +ve and b = 0
a is +ve and b is -ve
a = 0 and b is +ve

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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
Lower pair
Self-closed pair

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Theory of Machine
In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as

Tractive force
None of these
Hammer blow
Swaying couple

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.50 mm
3.0 mm
2 mm
2.22 mm

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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.

None of these
Body contact
Surface contact
Line or point contact

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