The coefficient of friction between the belt and pulley depends upon the

For same pulley diameters, center distance, belt speed and belt and pulley materials,

A

Open belt drive transmits more power than crossed belt drive

B

Crossed belt drive transmits more power than open belt drive

C

Open and crossed belt drives transmit same power

D

Power transmission does not depend upon open and crossed types of constructions

In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be

A

Increase key length

B

Increase key depth

C

Increase key width

D

Double all the dimensions

The coefficient of friction in belt drive depends upon

A

Material of belt

B

Material of pulley

C

Materials of belt and pulley

D

Belt velocity

A pulley and belt in a belt drive form a

A

Cylindrical pair

B

Turning pair

C

Rolling pair

D

Sliding pair

In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

A

Increase the key length

B

Increase the key depth

C

Increase the key width

D

Decrease the key length

The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt.

A

Speed

B

Thickness

C

Length

D

None of these

A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

A

Magnitude of the forces on journal

B

Angular velocity of journal

C

Clearance between journal and bearing

D

Radius of journal

The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

A

$$\frac{{\text{D}}}{{{\text{D}} - {\text{d}}}}$$

B

$$\frac{{\text{D}}}{{{\text{D}} + {\text{d}}}}$$

C

$$\frac{{2{\text{D}}}}{{{\text{D}} - {\text{d}}}}$$

D

$$\frac{{2{\text{D}}}}{{{\text{D}} + {\text{d}}}}$$

For a shoe brake, the equivalent coefficient of friction is equal to (where $$\mu $$ = Actual coefficient of friction and $$\theta $$ = Semi-block angle)

A

$$\frac{{2\mu \sin \theta }}{{\theta + \sin \theta }}$$

B

$$\frac{{\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$

C

$$\frac{{4\mu \sin \theta }}{{\theta + \sin \theta }}$$

D

$$\frac{{4\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$

The coefficient of friction depends upon

A

Nature of surfaces

B

Area of contact

C

Shape of the surfaces

D

All of the above

The coefficient of friction between the belt and pulley depends upon the

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