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Theory of Machine

Theory of Machine
The locus of a point on a thread unwound from a cylinder will be

Involute
Cycloidal
A straight line
A circle

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Theory of Machine
Which of the following mechanism is obtained from lower pair?

Valve and valve gears
Pantograph
Gyroscope
All of these

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Theory of Machine
Which of the following is a pendulum type governor?

Watt governor
None of these
Hartnell governor
Porter governor

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Theory of Machine
The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is

Along PO
Perpendicular to PO
None of the listed here
At 45° to PO

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

G.I₂
I₂/G²
I₂/G
G².I₂

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ - S₂) / h
(S₁ - S₂) / 2h
(S₁ + S₂) / h
(S₁ + S₂) / 2h

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