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Theory of Machine

Theory of Machine
The brake commonly used in railway trains is

Band brake
Internal expanding brake
Band and block brake
Shoe brake

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ - ω₂)r
ω₁.ω₂.r
(ω₁ - ω₂)2r
(ω₁ + ω₂)r

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Theory of Machine
________ is an inversion of Double slider crank chain.

Hand pump
Reciprocating engine
Scotch yoke mechanism
Coupling rod of a locomotive

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Theory of Machine
Which of the following is an inversion of a double slider crank chain?

Oldham's coupling
Scotch yoke mechanism
Elliptical trammel
All of these

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Theory of Machine
The arrangement is called bevel gearing, when two __________ are connected by gears.

Non-intersecting and non-coplanar shafts
Parallel and coplanar shafts
Intersecting and coplanar shafts
Parallel and non-coplanar shafts

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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

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

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