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Theory of Machine

Theory of Machine
If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to

l + 1
l
l - 2
l - 1

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Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Rolling pair
Surface pair
Higher pair
Sliding pair

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Theory of Machine
The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as

Successfully constrained motion
Incompletely constrained motion
Completely constrained motion
None of these

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Theory of Machine
The factor which affects the critical speed of a shaft is

Eccentricity
Diameter of disc
Span of shaft
All of the listed here

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Theory of Machine
In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

50°- 60°
60°-70°
80°- 90°
70°- 80°

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Theory of Machine
The driving and driven shafts connected by a Hooke's joint will have equal speeds, if

cotθ = cosα
cosθ = sinα
sinθ = ± tanα
tanθ = ± cosα

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