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Theory of Machine

Theory of Machine
In a reciprocating engine, usually __________ of the reciprocating masses are balanced.

Two-third
Three-fourth
One-half
Whole

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Theory of Machine
Length of arc of contact is given by

Arc of approach × Arc of recess
Arc of approach - Arc of recess
Arc of approach / Arc of recess
Arc of approach + Arc of recess

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Theory of Machine
In an ideal machine, the output as compared to input is

Equal
Less
More
May be less or more depending on efficiency

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Theory of Machine
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

5
2
3
4

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Theory of Machine
Maximum fluctuation of energy in a flywheel is equal to [where I = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed, and ω = Mean angular speed = (ω₁ + ω₂)/2]

2.E.CS
I.ω².CS
I.ω.(ω₁ - ω₂)
All 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 - sin² θ)
ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]
ω². (r₁ + r₂). (1 + cos² θ)
ω². (r₁ r₂). (1 - cos² θ)

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