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Theory of Machine

Theory of Machine
In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.

Greater than
None of these
Equal to
Less than

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

The shafts are rotating at very high speeds
Bearing centre line coincides with the axis
Resonance is caused due to the heavy mass of the rotor
The system is unbalanced

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Theory of Machine
The height of a Watt's governor (in meters) is equal to (where N = Speed of the arm and ball about the spindle axis)

895/N²
89.5/N²
8950/N²
8.95/N²

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

Screw pair
Turning pair
Rolling pair
Sliding pair

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Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

Permanent instantaneous centers
None of these
Fixed instantaneous centers
Neither fixed nor permanent instantaneous centers

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Theory of Machine
Oldham’s coupling is an inversion of the kinematic chain used in

Whitworth quick return mechanism
Universal joint
Elliptical trammels
Rotary engine

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