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Theory of Machine

Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W cosθ
W sinθ
W cosecθ
W tanθ

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Theory of Machine
A watt's governor can work satisfactorily at speeds from

60 to 80 r.p.m.
100 to 200 r.p.m.
200 to 300 r.p.m.
80 to 100 r.p.m.

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Theory of Machine
The frictional torque transmitted by a disc or plate clutch is same as that of

Truncated conical pivot bearing
Flat collar bearing
Flat pivot bearing
Conical pivot bearing

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Theory of Machine
The amplitude of vibration is always __________ the radius of the circle.

Equal to
Greater than
Less than
None of these

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Theory of Machine
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by

ω². (r₁ r₂). (1 - cos² θ)
ω². (r₁ - r₂). (1 - sin² θ)
ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]
ω². (r₁ + r₂). (1 + cos² θ)

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Theory of Machine
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

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

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