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प्रश्न
What is the use of a fixed pulley?
उत्तर
A fixed pulley is used to change the direction of effort to a convenient direction.
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संबंधित प्रश्न
The mechanical advantage of an actual pulley is less than one. Give a reason. What is the justification for using the pulley then?
Draw a neat labelled diagram showing a pulley being used to lift a load. How are load and effort related in an ideal situation?
What is a gear system ?
Explain how a gear system can be used to obtain Change in direction of rotation. Given one example.
Define the following term in reference to a gear system for Driven gear ?
Draw a diagram of a combination of three movable pulleys and one fixed pulley to lift up a load. In the diagram, show the directions of load, effort and tension in each strand. Find:
- mechanical advantage,
- Velocity ratio and
- efficiency of the combination in ideal situation.
Give reason for the following:
The lower block of a block and tackle pulley system must be of negligible weight
Give reason for the following:
The efficiency of a pulley is always less than 100%
In the case of a block and tackle arrangement, the mechanical advantage increases with the number of pulleys. Explain.
What is a pulley?
