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Theory of Machine

Theory of Machine
In S.H.M., the velocity vector w.r.t. displacement vector

Leads by 180°
Leads by 90°
Lags by 90°
Are in phase

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Theory of Machine
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.

Smaller
Larger
Smaller OR Larger
None of the listed here

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Theory of Machine
The Coriolis component of acceleration is taken into account for

All of these
Slider crank mechanism
Quick return motion mechanism
Four bar chain mechanism

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Theory of Machine
Which of the following is a spring controlled governor?

Hartung governor
Wilson-Hartnell governor
Hartnell governor
All of these

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Theory of Machine
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

0° and 90°
180° and 360°
Both (A) and (B)
None 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) (y/x)
(r₁ - r₂) (y/x)
(r₁ - r₂) (x/y)
(r₁ + r₂) (x/y)

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