Mechanical Engineering - Theory of machines

36. 

The sliding pairs, turning pairs and screw pairs form lower pairs.

A. True
B. False

Answer: Option A

Explanation:

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37. 

When a particle moves round the circumference of a circle of radius r with ω rad/s, then its maximum acceleration is ω2r.

A. Right
B. Wrong

Answer: Option A

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38. 

The static friction

A. bears a constant ratio to the normal reaction between the two surfaces
B. is independent of the area of contact, between the two surfaces
C. always acts in a direction, opposite to that in which the body tends to move
D. all of the above

Answer: Option D

Explanation:

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39. 

A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

A. 2 mm
B. 2.22 mm
C. 2.50 mm
D. 3.0 mm

Answer: Option B

Explanation:

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40. 

The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

A. 90° and 180°
B. 45° and 225°
C. 180° and 270°
D. 270° and 360°

Answer: Option B

Explanation:

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