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Theory of Machine

Theory of Machine
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

90°
180°
360°
0°

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Theory of Machine
The height of a Watt's governor (in meters) is equal to (where N = Speed of the arm and ball about the spindle axis)

895/N²
8.95/N²
8950/N²
89.5/N²

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Theory of Machine
The secondary unbalanced force is maximum __________ in one revolution of the crank.

Sixteen times
Eight times
Two times
Four times

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Theory of Machine
The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.

Less than
Equal to
None of these
Greater than

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Theory of Machine
When a slider moves on a fixed link having curved surface, their instantaneous centre lies

At the pin joint
At the centre of circle
On their point of contact
At the centre of curvature

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Theory of Machine
Efficiency of a screw jack is given by

tan (α + φ)/tanα
tanα/tan (α +φ)
tanα/tan (α - φ)
tan (α - φ)/tanα

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