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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°
0°
180°
360°

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Theory of Machine
The maximum value of the pressure angle in case of cam is kept as

30°
10°
14°
20°

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

90° and 180°
270° and 360°
135° and 315°
0° and 90°

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Theory of Machine
A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

Straight line path
Parabolic path
Elliptical path
Hyperbolic path

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Theory of Machine
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

m.ω².r cosθ
(1 - c).m.ω².r (cosθ - sinθ)
m.ω².r (cosθ - sinθ)
m.ω².r sinθ

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Theory of Machine
The velocity of a body moving with simple harmonic motion is __________ at the mean position.

Zero
None of these
Minimum
Maximum

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