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Theory of Machine

Theory of Machine
Carnot cycle is

an irreversible cycle
a semi-reversible cycle
a quasi static cycle
a reversible cycle

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

More than
Same as
Less 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) cosφ]/2
[(r + R) sinφ]/2
[(r² + R²) cosφ]/2
[(r² + R²) sinφ]/2

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Theory of Machine
Which of the following mechanism is obtained from lower pair?

Valve and valve gears
Pantograph
Gyroscope
All of these

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Theory of Machine
The gear train usually employed in clocks is a

Sun and planet gear
Reverted gear train
Differential gear
Simple gear train

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is

Slightly more than 95 mm
Slightly less than 95 mm
45 mm
95 mm

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