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Theory of Machine

Theory of Machine
The relative velocity of B with respect to A in a rigid link AB is

At 45° to AB
Along AB
Parallel to AB
Perpendicular to AB

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Theory of Machine
If there are L number of links in a mechanism, then number of possible inversions is equal to

L + 2
L
L + 1
L - 1

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Theory of Machine
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

Magnification factor
Damping coefficient
Logarithmic decrement
Damping factor

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Theory of Machine
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

n = 3(l - 1) - 3j - h
n = 3(l - 1) - 2j - h
n = 2(l - 1) - 3j - h
n = 2(l - 1) - 2j - h

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Theory of Machine
A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)

(1/2). I ω ωP
I ω ωP
(1/2).Iω²
Iω²

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Theory of Machine
Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?

Meyer's expansion valve
D-slide valve
Governor
Flywheel

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