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Theory of Machine

Theory of Machine
Rectilinear motion of piston is converted into rotary by

Connecting rod
Cross head
Gudgeon pin
Slider crank

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Theory of Machine
An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be

700°K
625°K
650°K
600°K

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Theory of Machine
Which of the following is a lower pair?

Piston and cylinder
Both (A) and (B) above
Ball and socket i
Cam and follower

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Theory of Machine
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is

Flexible coupling
Universal coupling
Chain coupling
Oldham's coupling

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Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

ω² × OQ
ω² × OQ sinθ
ω² × OQ tanθ
ω² × OQ cosθ

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Theory of Machine
In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

loge(x₁/x₂)
log(x₁.x₂)
x₁/x₂
log(x₁/x₂)

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