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Theory of Machine

Theory of Machine
A pulley and belt in a belt drive form a

Sliding pair
Turning pair
Rolling pair
Cylindrical pair

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Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

m₁ r₂ = m₂ r₁
None of these
m₁ r₁ = m₂ r₂
m₁ m₂ = r₁ r₂

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Theory of Machine
One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

2π. √(g/δ)
1/2π. √(δ/g)
1/2π. √(g/δ)
2π. √(δ/g)

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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

Meyer's expansion valve
Governor
Flywheel
D-slide valve

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Theory of Machine
Governor is used in automobile to

Maximize the fuel economy
Decrease the variation of speed
Limit the vehicle speed
Maintain constant engine speed

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Theory of Machine
The gear train usually employed in clocks is a

Differential gear
Sun and planet gear
Reverted gear train
Simple gear train

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