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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 - 1
l - 2
l

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

15°-25°
10°-15°
30°-40°
25°-30°

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Theory of Machine
The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.

None of these
More than
Same as
Less than

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Theory of Machine
The amplitude of vibration is always __________ the radius of the circle.

Less than
Equal to
Greater than
None of these

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Theory of Machine
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r + R) sinφ]/2
[(r + R) cosφ]/2
[(r² + R²) sinφ]/2
[(r² + R²) cosφ]/2

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Theory of Machine
The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Turning pair
Sliding pair
Spherical pair
Rolling pair

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