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Theory of Machine

Theory of Machine
A pantograph is a mechanism with

Turning pairs
Rolling pairs
Higher pairs
Lower pairs

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Theory of Machine
In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at

45° to each other
180° to each other
120° to each other
90° to each other

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Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

None of these
m₁ m₂ = r₁ r₂
m₁ r₂ = m₂ r₁
m₁ r₁ = m₂ r₂

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Theory of Machine
Hart mechanism has

Six links
Four links
Twelve links
Eight links

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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)2r
(ω₁ + ω₂)r
ω₁.ω₂.r

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Theory of Machine
In order to balance the reciprocating masses,

None of these
Both (A) and (B)
Primary forces and couples must be balanced
Secondary forces and couples must be balanced

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