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Theory of Machine

Theory of Machine
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

20
30
10
34

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Theory of Machine
When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

Increases
Remains constant
Decreases
None of these

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Theory of Machine
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

Dedendum circle
Clearance circle
Addendum circle
Pitch circle

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Theory of Machine
With single Hooke's joint it is possible to connect two shafts, the axes of which have an angular misalignment up to

40°
10°
20°
30°

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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

fn/2
2 fn
4 fn
8 fn

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Theory of Machine
Cross head and guides form a

Turning pair
Sliding pair
Lower pair
Higher pair

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