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Theory of Machine

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

30°
14°
10°
20°

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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 anticlockwise 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
When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

None of these
Remains constant
Decreases
Increases

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Theory of Machine
Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism

1, 3 and 4
1, 2 and 4
2, 3 and 4
1, 2 and 3

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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
12
4/15
1/24

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Theory of Machine
An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be

700°K
600°K
650°K
625°K

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