DTS Quiz-6

V-belts get their name because of 

• Their V-shaped cross section 

• Their dimensions 

• Their power transmission direction

• Their appearance 

Answer explanation

V-belts get their name from their trapezoidal shape, which helps them wedge into the sheaves.

Twisted synthetic fibrous tensile chords, compressed by synthetic rubber form a typical V-belt, rendering it strength and flexibility.

A belt of rectangular cross section is known as

• Leather Belt

• V-Belt

• Crossed Belt

• Flat Belt

Answer explanation

Flat Belt: Flat belts are one of the most common types of industrial belts.These belts have a rectangular cross-section and rest on top of flay pulleys for operation.A leather belt was originally used in flat belt applications, therefore, the cross-section of leather belts is a rectangular one, But over time, with the discovery of new materials such as rubber and synthetic polymer, the use of leather belts has somewhat diminished.Flat belts work best with crowned or tapered pulleys.

For a belt of mass per unit length 4 kg/m, running at maximum power transmission; if the maximum tension of the belt is 4800 N, calculate the speed of the belt in m/s.

• 400 m/s

• 20 m/s

• 0.4 m/s

• 0.2 m/s

Answer explanation

Vee-belt E-type cross-sections are generally used in

• Automobiles

• Small Engines

• When driver and driven units are far off

• Heavy duty machine

Answer explanation

Vee- Belt

The Vee belts are made up of rubber with fabric cords to transmits power and it's covered with a protective layer.

The cords transmit the force from the driver to the driven pulley, thereby transmit the power.

Vee belts are widely used in industry and automobiles because of their power transmitting capacity.

The wedge shape of the belt increases the area of contact with the pulley thereby increasing more friction, which makes it carry more power without slip.

In a belt drive system, when the speed of the belt increases

• Co-efficient of friction between the belt and pulley increases 

• Co-efficient of friction between the belt and pulley decreases

• Power transmitted will decrease

• Power transmitted will increase

Answer explanation

Explanation:

Power transmitted from one shaft to another shaft by means of Belts, ropes, chains, gears.

A belt drive is a flexible drive. In flexible drives, there is an intermediate link such as a belt, rope, or chain between the driving and driven shafts.

Since this link is flexible, the drives are called flexible drives.

Features of Belt drive:

Belt drives can transmit power over a considerable distance between the axes of driving and driven shafts.

The operation of the belt drive is smooth and silent.

They can transmit only a definite load, which if exceeded, will cause the belt to slip over the pulley, thus protecting the parts of the drive against overload.

They have the ability to absorb shocks and damp vibrations.​