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Engineering
Mechanical
ME Set-1
Theory of Machines
23

Theory of Machines MCQ with Answers

23) The dynamic friction is the friction experienced by a body, when the body

is in motion

is at rest

just begins to slide over the surface of the other body

none of the above

Answer is:

is in motion

Explanation:

The friction, experienced by a body, when in motion, is known as dynamic friction or kinetic friction. Dynamic friction is always less than static friction. The dynamic friction is of three types, i.e. sliding friction, rolling friction and pivot friction.

Theory of Machines MCQ with Answers

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Related Theory of Machines MCQ with Answers

24) The steering of a ship means

movement of a complete ship up and down in vertical plane about transverse axis

turning of a complete ship in a curve towards right or left, while it moves forward

rolling of a complete ship side-ways

none of the above

Answer is:

turning of a complete ship in a curve towards right or left, while it moves forward

25) The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ? = Angular speed of crank, r = Radius of crank, and ? = Angle of inclination o

m.?².r cos ?

c.m.?².r sin ?

(1 - c)m.?².r(cos ? - sin ?)

m.?².r(cos ? - sin ?)

Answer is:

(1 - c)m.?².r(cos ? - sin ?)

26) The radial distance of a tooth from the pitch circle to the bottom of the tooth is called

dedendum

addendum

clearance

working depth

Answer is:

dedendum

27) When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be

minimum

zero

maximum

none of these

Answer is:

zero

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