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Theory of Machine

Theory of Machine
The Hooke's joint consists of:

Two forks
One fork
Three forks
Four forks

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Theory of Machine
A cam with a roller follower would constitute following type of pair

Close pair
Higher pair
Lower pair
Open pair

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Theory of Machine
The dynamic friction is the friction experienced by a body, when the body

Just begins to slide over the surface of the other body
Is at rest
Is in motion
None of these

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Theory of Machine
When the primary direct crank of a reciprocating engine makes an angle of 'θ' with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.

θ
θ/2
2θ
4θ

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Theory of Machine
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

360°
180°
0°
90°

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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)2r
ω₁.ω₂.r
(ω₁ - ω₂)r
(ω₁ + ω₂)r

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