Mechanical Engineering - Theory of machines

26. 

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

A. is in motion
B. is at rest
C. just begins to slide over the surface of the other body
D. none of the above

Answer: Option A

Explanation:

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27. 

The steering of a ship means

A. movement of a complete ship up and down in vertical plane about transverse axis
B. turning of a complete ship in a curve towards right or left, while it moves forward
C. rolling of a complete ship side-ways
D. none of the above

Answer: Option B

Explanation:

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28. 

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, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

A. m2.r cos θ
B. c.m2.r sin θ
C. (1 - c)m2.r(cos θ - sin θ)
D. m2.r(cos θ - sin θ)

Answer: Option C

Explanation:

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29. 

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

A. dedendum
B. addendum
C. clearance
D. working depth

Answer: Option A

Explanation:

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30. 

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

A. minimum
B. zero
C. maximum
D. none of these

Answer: Option B

Explanation:

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