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Theory of Machine

Theory of Machine
In a ball bearing, ball and bearing forms a

Screw pair
Turning pair
Rolling pair
Spherical pair

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Theory of Machine
When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.

Opposite
None of these
Perpendicular
Same

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Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Surface contact
None of these
Body contact
Line or point contact

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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 body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)

P = W tan (α + φ)
P = W (sin α + μ cos α)
P = W tan α
P = W (cos α + μ sin α)

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Theory of Machine
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to

1
-1
2

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