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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 sinθ
W cosθ
W cosecθ
W tanθ

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Theory of Machine
The relation between number of links (l) and number of joints (j) in a kinematic chain is

l = j + 4
l = (1/2).(j + 2)
l = (3/4).(j + 3)
l = (2/3).(j + 2)

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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
The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

A single plane
Four planes
Three planes
Two planes

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Theory of Machine
Frequency of vibrations is usually expressed in

None of these
Number of cycles per minute
Number of cycles per second
Number of cycles per hour

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Theory of Machine
If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

Same as the first one
Four times the first one
One fourth of the first one
One and a half times the first one

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