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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

20
34
30
10

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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
A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be

data are insufficient
90 RPM
100 RPM
80 RPM

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Theory of Machine
Which of the following has sliding motion?

Crank pin
Cross-head
Crank
Connecting rod

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Theory of Machine
A circular bar moving in a round hole is an example of

Partially constrained motion
Successfully constrained motion
Completely constrained motion
Incompletely constrained motion

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Theory of Machine
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

n = 3(l - 1) - 2j - h
n = 2(l - 1) - 2j - h
n = 3(l - 1) - 3j - h
n = 2(l - 1) - 3j - h

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