Crowning on pulleys helps

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

Crowning on pulleys helps

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