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Theory of Machine

Theory of Machine
The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

Difference
Product
Ratio
Sum

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Theory of Machine
The partial balancing means

All of these
Balancing partially revolving masses
Balancing partially reciprocating masses
Best balancing of engines

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Theory of Machine
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

Horizontally and perpendicular
Vertically and perpendicular
Horizontally and parallel
Vertically and parallel

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 45° + φ/2
α = 90° - φ
α = 45° - φ/2
α = 90° + φ

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

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Theory of Machine
The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

None of these
Same
Unpredictable
Different

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