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Theory of Machine

Theory of Machine
Carnot cycle is

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

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Theory of Machine
The main disadvantage of the sliding pair is that it is

Difficult to manufacture
Bulky
Wears rapidly
Both (A) and (B) above

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Theory of Machine
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

2π qI
1/2π
(1/2π). √(q/I)
2π. √(q/I)

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

4 fn
fn/2
8 fn
2 fn

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Theory of Machine
An exact straight line motion mechanism is a

All of these
Hart's mechanism
Peaucellier's mechanism
Scott-Russell's mechanism

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Theory of Machine
In involute gears, the pressure angle is

Always constant
Dependent on the size of gears
Always variable
Dependent on the size of teeth

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