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Theory of Machine

Theory of Machine
A higher pair has__________.

Surface contact
None of these
Point contact
No contact

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Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ r₂) sinθ
ω (r₁ + r₂) cosθ cosec2θ
ω (r₁ r₂) cosθ
ω (r₁ + r₂) sinθ sec2θ

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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) 2r
(ω₁ - ω₂) r
(ω₁ + ω₂) r
ω₁.ω₂.r

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Theory of Machine
The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.

None of these
Equal to
Less than
Greater than

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

None of these
Maximum
Zero
Minimum

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