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Theory of Machine

Theory of Machine
The lower pairs are _________ pairs.

Self-closed
Force-closed
Friction closed
None of these

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Theory of Machine
The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

Different
None of these
Unpredictable
Same

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Theory of Machine
V-belts are usually used for

None of these
Long drives
Long and short drives
Short drives

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Theory of Machine
The periodic time is given by (where ω = Angular velocity of the particle in rad/s)

π/ω
ω/2π
ω × 2π
2π/ω

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Theory of Machine
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Self-closed pair
Lower pair
Force-closed pair
Higher pair

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Theory of Machine
Relationship between the number of links (L) and number of pairs (P) is

P = 2L - 2
P = 2L + 4
P = 2L + 2
P = 2L - 4

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