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Theory of Machine

Theory of Machine
Carnot cycle is

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

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Theory of Machine
Flexible coupling is used because

It is easy to disassemble
It transmits shocks gradually
It is easy to engage and disengage
It prevents shock transmission and eliminates stress reversals

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Theory of Machine
The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be

0, and more than co2r
cor, 0
0, 0
0, and less than coV

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Theory of Machine
When brakes are applied to all the four wheels of a moving car, the distance traveled by the car before it is brought to rest, will be

Maximum
Zero
Minimum
None of these

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Theory of Machine
The working depth of a gear is the radial distance from the

Pitch circle to the bottom of a tooth
Top of a tooth to the bottom of a tooth
Addendum circle to the clearance circle
Pitch circle to the top of a tooth

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Theory of Machine
In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

(r₁ + r₂) (y/x)
(r₁ + r₂) (x/y)
(r₁ - r₂) (x/y)
(r₁ - r₂) (y/x)

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