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Theory of Machine

Theory of Machine
V-belts are usually used for

None of these
Short drives
Long and short drives
Long drives

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ - S₂) / 2h
(S₁ + S₂) / h
(S₁ + S₂) / 2h
(S₁ - S₂) / h

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Theory of Machine
The height of a Watt's governor (in meters) is equal to (where N = Speed of the arm and ball about the spindle axis)

895/N²
89.5/N²
8.95/N²
8950/N²

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Theory of Machine
A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

Forced vibration with damping
Free vibration with damping
Forced vibration without damping
Free vibration without damping

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

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Theory of Machine
Which one of the following is an exact straight line mechanism using lower pairs?

Watt’s mechanism
Robert’s mechanism
Peaucellier’s mechanism
Grasshopper mechanism

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