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Theory of Machine

Theory of Machine
The maximum value of the pressure angle in case of cam is kept as

10°
14°
20°
30°

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Theory of Machine
The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

1
4
2
3

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Theory of Machine
Which of the following is an example of sliding pair?

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

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

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Theory of Machine
A pantograph is a mechanism with

Higher pairs
Lower pairs
Rolling pairs
Turning pairs

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Theory of Machine
Hart mechanism has

Twelve links
Four links
Six links
Eight links

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