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Theory of Machine

Theory of Machine
The size of cam depends upon

Prime circle
Pitch circle
Base circle
Pitch curve

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Theory of Machine
Which of the following is an example of sliding pair?

Piston and cylinder of a reciprocating steam engine
Ball and a socket joint
Lead screw of a lathe with nut
Shaft with collars at both ends fitted into a circular hole

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Theory of Machine
When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a

D-slide valve
Meyer's expansion valve
Flywheel
Governor

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Theory of Machine
Creep in belt drive is due to

Material of the pulley
Material of the belt
Larger size of the driver pulley
Uneven extensions and contractions due to varying tension

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 45° + φ/2
α = 90° + φ
α = 45° - φ/2
α = 90° - φ

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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

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

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