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Theory of Machine

Theory of Machine
A higher pair has__________.

None of these
Point contact
Surface contact
No contact

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Theory of Machine
A spring controlled governor is said to be isochronous when the controlling force

Remain constant for all radii of rotation
Increases as the radius of rotation increases
Increases as the radius of rotation decreases
Decreases as the radius of rotation increases

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Theory of Machine
Idler pulley is used

For changing the direction of motion of the belt
All of the listed here
For applying tension
For increasing velocity ratio

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Theory of Machine
Governor is used in automobile to

Limit the vehicle speed
Decrease the variation of speed
Maximize the fuel economy
Maintain constant engine speed

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Theory of Machine
The pair is known as a higher pair, when the relative motion between the elements of a pair is

Turning only
Partly turning and partly sliding
Rolling only
Sliding only

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tan(φ + α)
T = W.r tan(φ - α)
T = W.r tanφ
T = W.r tanα

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