Related Questions

The objective of 'crowning' of the flat pulleys of belt drive is to
A Prevent the belt from running off the pulley
B Increase the power transmission capacity
C Increase the belt velocity
D Prevent the belt joint from damaging the belt surface
When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.
A Same
B Opposite
C Perpendicular
D None of these
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.
A Heavier
B Lighter
C Moderate
D None of these
If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys.
A First
B Second
C Third
D None of these
The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)
A n
B n2
C 2n
D 2n - 1
Crowning on pulley helps
A In decreasing the slip of the belt
B In increasing the slip of the belt
C To keep the belt in centre on a pulley while it is in motion
D To increase pulley life
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then
A open belt drive is recommended
B cross belt drive is recommended
C both open belt drive and cross belt drive are recommended
D the drive is recommended depending upon the torque transmitted
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.
A Smaller
B Larger
C Either A or B
D None of these
The groove angle of pulleys for V-belt is
A 34° to 36°
B 42° to 45°
C More than 45°
D 30° to 32°
The arms of the pulleys for flat belt drive have
A Elliptical cross-section
B Major axis in plane of rotation
C Major axis twice the minor axis
D All the three characteristics

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