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Theory of Machine

Theory of Machine
The lead screw of a lathe with nut forms a

Turning pair
Screw pair
Rolling pair
Sliding pair

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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

None of these
0° and 90°
Both (A) and (B)
180° and 360°

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Theory of Machine
A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be

80 RPM
100 RPM
data are insufficient
90 RPM

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Theory of Machine
The swaying couple is due to the

Secondary unbalanced force
Primary unbalanced force
Partial balancing
Two cylinders of locomotive

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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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Theory of Machine
Flexible coupling is used because

It transmits shocks gradually
It is easy to engage and disengage
It is easy to disassemble
It prevents shock transmission and eliminates stress reversals

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