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Theory of Machine

Theory of Machine
In automobiles the power is transmitted from gear box to differential through

Bevel gear
Hooke's joint
Universal joint
Knuckle joint

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Theory of Machine
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

Zero
Less than unity
Greater than unity
Equal to unity

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Theory of Machine
A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

9,360 r.p.m.
12,000 r.p.m.
5,367 r.p.m.
6,000 r.p.m.

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Theory of Machine
When a point moves along a straight line, its acceleration will have

Radial and tangential components both
Tangential component only
Coriolis component only
Radial component only

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ + S₂) / h
(S₁ + S₂) / 2h
(S₁ - S₂) / h
(S₁ - S₂) / 2h

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

Maximum
Zero
None of these
Minimum

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