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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/3
√(T/3m)
√(3m/T)
(T.g)/3

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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 throughout
Negative throughout
Positive during major portion of the stroke

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

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Theory of Machine
Two systems shall be dynamically equivalent when

The mass of two are same
All of these
G. of two coincides
M.I. of two about an axis through e.g. is equal

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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
Two directions only
One direction only
More than one direction

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

ω₁.ω₂.r
(ω₁ + ω₂)r
(ω₁ - ω₂)2r
(ω₁ - ω₂)r

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