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Theory of Machine

Theory of Machine
Cylindrical cams can be classified as

None of these
Reciprocating
Tangent
Circular

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Theory of Machine
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

l₁ = kG
l₁l₂ = kG
l₁l₂ = kG²
l₂ = kG

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Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Positive during major portion of the stroke
Negative during major portion of the stroke
Positive throughout
Negative throughout

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

Same
Opposite
Perpendicular
None of these

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Theory of Machine
In a spring controlled governor, when the controlling force ____ as the radius of rotation increases, it is said to be a stable governor.

Increases
None of the listed here
Decreases
Remains constant

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