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Theory of Machine

Theory of Machine
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

10
34
30
20

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Theory of Machine
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

1/8
1/24
12
4/15

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Theory of Machine
The power from the engine to the rear axle of an automobile is transmitted by means of

Spur gears
Hooke's joint
Worm and worm wheel
Bevel gears

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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.r
(ω₁ - ω₂)2r

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Theory of Machine
The gear train usually employed in clocks is a

Differential gear
Simple gear train
Reverted gear train
Sun and planet gear

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Theory of Machine
A shaft carrying three rotors will have

Two nodes
Three nodes
One node
No node

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