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Theory of Machine

Theory of Machine
The secondary unbalanced force is __________ the primary unbalanced force.

1/n times
Two-third
One-half
n times

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Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Negative throughout
Positive during major portion of the stroke
Positive throughout
Negative during major portion of the stroke

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Theory of Machine
________ is an inversion of Double slider crank chain.

Reciprocating engine
Coupling rod of a locomotive
Hand pump
Scotch yoke mechanism

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Theory of Machine
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

1/2π
2π qI
2π. √(q/I)
(1/2π). √(q/I)

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Theory of Machine
The mechanism consisting of three turning pairs and one sliding pair, is called a

Whitworth quick return motion mechanism
Crank and slotted lever quick return motion mechanism
Single slider crank chain
All of these

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Theory of Machine
In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

(r₁ - r₂) (x/y)
(r₁ + r₂) (x/y)
(r₁ - r₂) (y/x)
(r₁ + r₂) (y/x)

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