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Theory of Machine

Theory of Machine
Cam size depends upon

Prime circle
Outer circle
Pitch circle
Base circle

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Theory of Machine
According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a

Straight line
Parabolic curve
Rectangle
Triangle

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

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Theory of Machine
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

a is +ve and b = 0
a is +ve and b is -ve
a = 0 and b is +ve
a is +ve and b is also +ve

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Theory of Machine
Creep in belt drive is due to

Material of the pulley
Larger size of the driver pulley
Material of the belt
Uneven extensions and contractions due to varying tension

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Theory of Machine
The number of links and instantaneous centers in a reciprocating engine mechanism are

5, 4
4, 6
4, 4
4, 5

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MORE MCQ ON Theory of Machine

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