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Theory of Machine

Theory of Machine
In an ideal machine, the output as compared to input is

Equal
Less
May be less or more depending on efficiency
More

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

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

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Theory of Machine
A mechanism _________ for transmitting or transforming motion.

Can be used
None of these
Unpredictable
Can not be used

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Theory of Machine
In a steam engine, the link constitutes a

All of these
Piston, piston rod and cross-head
Connecting rod with big and small end brasses, caps and bolts
Crank pin, crankshaft and flywheel

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

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Theory of Machine
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

45° and 225°
270° and 360°
180° and 270°
90° and 180°

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