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Theory of Machine

Theory of Machine
Ackermann steering gear consists of

Sliding pairs
Rolling pairs
Higher pairs
Turning pairs

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Theory of Machine
The sense of Coriolis component is such that it

Lags the sliding velocity vector by 90°
Is along the sliding velocity vector
Leads the sliding velocity vector by 180°
Leads the sliding velocity vector by 90°

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Theory of Machine
In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

(r₁ + r₂) (y/x)
(r₁ + r₂) (x/y)
(r₁ - r₂) (y/x)
(r₁ - r₂) (x/y)

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Theory of Machine
A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)

Iω²
(1/2). I ω ωP
I ω ωP
(1/2).Iω²

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Theory of Machine
Angular acceleration of a link can be determined by dividing the

All of these
Tangential component of acceleration with length of link
Centripetal component of acceleration with length of link
Resultant acceleration with length of link

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Theory of Machine
Which of the following is a turning pair?

Ball and a socket joint
Shaft with collars at both ends fitted into a circular hole
Lead screw of a lathe with nut
Piston and cylinder of a reciprocating steam engine

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