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Theory of Machine

Theory of Machine
When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

Hunt
Unstable
Isochronous
Stable

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Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Negative during major portion of the stroke
Positive during major portion of the stroke
Positive throughout
Negative throughout

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Theory of Machine
Longitudinal vibrations are said to occur when the particles of a body moves

Perpendicular to its axis
In a circle about its axis
None of these
Parallel to its axis

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Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

Permanent instantaneous centers
Neither fixed nor permanent instantaneous centers
Fixed instantaneous centers
None of these

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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)

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

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Theory of Machine
In a screw jack, the effort required to lower the load W is given by

P = W tan(φ - α)
P = W cos(α + φ)
P = W tan(α + φ)
P = W tan(α - φ)

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