Theory of Machine
Angle of dwell of cam is defined as the angle

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Of rotation of the cam for definite displacement of the follower
Through which the cam rotates during the period in which the follower remains in the highest position
During which the follower returns to its initial position

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Theory of Machine
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

m.ω².r sinθ
m.ω².r cosθ
m.ω².r (cos 2θ/n)
m.ω².r (sin 2θ/n)

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is directly proportional to the normal force.
The friction force is independent of me area of contact.
All of these
The friction force is dependent on the materials of the contact surfaces.

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