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Theory of Machine

Theory of Machine
In order to double the period of a simple pendulum, the length of the string should be

Quadrupled
None of these
Halved
Doubled

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

(1/2) μ W R cosecα
μ W R cosecα
(3/4) μ W R cosecα
(2/3) μ W R cosecα

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Theory of Machine
A rotary internal combustion engine has __________ cylinders.

Five
Seven
Four
Six

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Theory of Machine
The velocity of sliding of meshing gear teeth is (Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)

(ω₁/ω₂) y
(ω₁ + ω₂) y
(ω₁ + ω₂)/y
(ω₁ × ω₂) y

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Theory of Machine
When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

ω² r {n/(n - 1)}
ω² r {(n - 1)/n}
ω² r {n/(n + 1)}
ω² r {(n + 1)/n}

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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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