Ten Viva Questions on Power transmission
Question.1. Define belt?
Answer.
The flexible wrapping connectors (belt and ropes) are used to transmit power from one shaft to another. When the wrapping connector takes the form of a band, whose thickness is small in comparison to width, it is called a belt.
Question.2. Name different types of belts.
Answer.
1. Flat belt,
2. V-belt,
3. Circular belt.
Question.3. Define flat belt.
Answer.
A bell having rectangular cross-section is known as flat belt.
Question.4. Define V-belt.
Answer.
The belt having trapezoidal cross-section is known as V-belt.
Question.5. Define Circular belts or ropes.
Answer.
The belt having circular cross-section is known as circular belt or rope.
Question.6. Name different types of pulleys for flat belts.
Answer.
The various types of pulleys for flat belts are as follows:
1. Cast iron pulleys,
2. Steel pulleys,
3. Wooden pulleys.
4. Fast and loose pulleys.
Question.7. Define velocity ratio of belt drive.
Answer.
It is the ratio of the speed of the driven pulley to that of driving pulley.
Q.8. Define slip in case of belt.
Answer.
If the difference in tension between tight and slack sides of the belt is too large to be resisted by friction between the belt and the pulley, then whole of the portion of the belt which is in contact with the pulley begins to slide. This results in relative motion between the belt and the pulley and is called slip.
Question.9. State law of belting.
Answer.
It state that the center of the line of the belt as it approaches the pulley must lie in a plane perpendicular to the axis of the pulley or must lie in the plane of the pulley, otherwise, the belt will run off the pulley.
Question.10. Define centrifugal tension in case of belt.
Answer.
When the belt continuously moves over the pulley, the centrifugal force due to its own weight tends to flit it from the pulley. The centrifugal force produces equal tensions on tight and slack side of the belt known as centrifugal tension.