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Theory of Machine

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

30°-40°
15°-25°
25°-30°
10°-15°

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Theory of Machine
In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

There is no such relationship
Greater than sum of other two
Less than sum of other two
Equal to sum of other two

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Theory of Machine
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

180°
360°
0°
90°

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Theory of Machine
Critical damping is a function of

Mass and stiffness
Damping coefficient and natural frequency
Mass and damping coefficient
Mass and natural frequency

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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)

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

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Theory of Machine
The sensitiveness of the governor _____ as the speed range decreases.

Increases
Remains unaffected
None of the listed here
Decreases

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