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प्रश्न
State if the following statement is true or false. Correct the statement if it is false.
A single movable pulley is a pulley that has its axis of rotation fixed.
विकल्प
True
False
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उत्तर
False.
A single fixed pulley is a pulley that has its axis of rotation fixed.
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संबंधित प्रश्न
Name a machine to change the direction of force ?
Explain how a gear system can be used to obtain gain in torque? Given one example.
Define the following term in reference to a gear system for Gain in torque ?
What is a single movable pulley? What is its mechanical advantage in the ideal case?
Give reason for the following:
The lower block of a block and tackle pulley system must be of negligible weight
The diagram below shows a pulley arrangement.
(i) In the diagram, mark the direction of the forces due to tension, acting on the pulley P.
(ii) What is the purpose of the pulley Q?
(iii) If the tension is T newton, deduce the relation between T and E.
(iv) Calculate the velocity ratio of the arrangement.
(v) Assuming that the efficiency of the system is 100%, what is the mechanical advantage?
(vi) Calculate the value of E
Give reason for the following:
In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys.
Draw the diagram of a single movable pulley and obtain its mechanical advantage, velocity ratio, and efficiency.
In a single movable pulley system, a load of 125 kgf is lifted by an effort of 75 kgf. Find the percentage efficiency of system.
Complete the table.
| S. No | Types of Simple Machine | Example |
| 1. | Pulley | |
| 2. | Wheel and axle | |
| 3. | Wedge | |
| 4. | Inclined plan | |
| 5. | Lever | |
| 6. | Screw |
