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Theory of Machine

Theory of Machine
A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is

2ωv
ωv
2ωv²
ω²v

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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
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

a is +ve and b = 0
a is +ve and b is also +ve
a is +ve and b is -ve
a = 0 and b is +ve

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Theory of Machine
The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.

None of these
Outer edge
Inner edge
Corners

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

(2/3) μ W R
μ W R
(1/2) μ W R
(3/4) μ W R

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Theory of Machine
The sensitiveness of the governor _____ as the speed range decreases.

Increases
Remains unaffected
Decreases
None of the listed here

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