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Theory of Machine

Theory of Machine
The velocity of the belt for maximum power is (where m = Mass of the belt in kg per meter length)

√(T/3m)
T/3
√(3m/T)
(T.g)/3

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Theory of Machine
Efficiency of a screw jack is given by

tanα/tan (α - φ)
tanα/tan (α +φ)
tan (α - φ)/tanα
tan (α + φ)/tanα

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

G².I₂
G.I₂
I₂/G
I₂/G²

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Theory of Machine
The motion between a pair which takes place in ____ is known as incompletely constrained motion.

None of the listed here
More than one direction
One direction only
Two directions only

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Theory of Machine
If ‘D₁’ and ‘D₂’ be the diameters of driver and driven pulleys, then belt speed is proportional to

D₁
D₁/D₂
D₂/D₁
D₁.D₂

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Theory of Machine
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

m.ω².r sinθ
m.ω².r (cosθ - sinθ)
m.ω².r cosθ
(1 - c).m.ω².r (cosθ - sinθ)

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