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Theory of Machine

Theory of Machine
The critical speed of a shaft depends upon its

Stiffness
Stiffness and eccentricity
Mass and stiffness
Mass

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

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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

30°-40°
15°-25°
10°-15°
25°-30°

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Theory of Machine
In a simple train of wheels, the velocity ratio __________ the intermediate wheels.

Depends upon
Is independent of
Either A or B
None of these

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Theory of Machine
If ‘D₁’ and ‘D₂’ be the diameters of driver and driven pulleys, then belt speed is proportional to

D₁
D₂/D₁
D₁/D₂
D₁.D₂

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Theory of Machine
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Under damped vibration
Forced vibration
Damped vibration
Free vibration

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