78.

79.

80.

81.

82.

83.

84.

079/21

Choose the correct statement for safe design.

A) For power lost in friction uniform wear is assumed.

B) For power lost in friction uniform pressure is assumed.

C) For power transmitted due to friction uniform pressure is assumed.

D) For power transmitted due to friction or lost in friction uniform wear is assumed.

If effective tension of belt drive increased by 20%, on both tight side and slackside
of belt drive tension is 36, then the power transmitted is

A) 12 kW 8) 10 kw

00 ۷ D) not possible to find with this data

Tooth interference in an external involute spur gear pair can be reduced by
A) Decreasing centre distance between gear pair

B) Decreasing module

C) Decreasing pressure angle

D) Increasing number of gear teeth

For power transmission commonly used tooth profile in gear drives are
A) Acycloid B) An involute
C) Anellipse D) A parabola

Which of the following is classified as transmission dynamometer ?
A) Torsion dynamometer 8) Froude’s hydraulic dynamometer
C) Prony brake dynamometer D) Belt dynamometer

The pressure angle for spur gears is kept small

A) To increase the force for power transmission in gears

B) To reduce the axial thrust on bearings on which gears are mounted
C) Both A) and B)

D) None of the above

Gear train used in clocks is
A) Simple gear train B) Reverted gear train
C) Sun and planet gear D) Differential gear

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