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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

8
28
30
15

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

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Theory of Machine
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

P = W tan(α + φ)
P = W tan(α - φ)
P = W cos(α + φ)
P = W tan(φ - α)

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Theory of Machine
When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side.

Forward
Backward
Upward
Downward

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Theory of Machine
The swaying couple is due to the

Two cylinders of locomotive
Primary unbalanced force
Partial balancing
Secondary unbalanced force

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Theory of Machine
A circle passing through the pitch point with its center at the center of cam axis is known as

Pitch circle
Prime circle
Outer circle
Base circle

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