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Theory of Machine

Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W cosecθ
W sinθ
W tanθ
W cosθ

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Theory of Machine
The train value of a gear train is

Always less than unity
Always greater than unity
Reciprocal of velocity ratio of a gear train
Equal to velocity ratio of a gear train

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Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ + r₂) cosθ cosec2θ
ω (r₁ r₂) sinθ
ω (r₁ r₂) cosθ
ω (r₁ + r₂) sinθ sec2θ

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

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

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Theory of Machine
The danger of breakage and vibration is maximum

Below the critical speed
Near the critical speed
None of these
Above the critical speed

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Theory of Machine
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is

Soundness would depend upon which link is kept fixed
Data is not sufficient to determine same
Not sound
Kinematically sound

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