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प्रश्न
What is a pulley?
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उत्तर
A pulley is an example of a simple type of machine. It is either a wooden or a metallic disc which can rotate about a horizontal axis passing through its centre. It has a grooved rim along which a rope or chain can slide. It is generally mounted in a framework called a block.
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संबंधित प्रश्न
Is the above pulley system an ideal machine or not?
Explain how a gear system can be used to obtain gain in speed? Given one example.
Define the following term in reference to a gear system for Gear ratio ?
Define the following term in reference to a gear system for Gain in speed ?
Name the type of single pulley that can act as a force multiplier. Draw a labelled diagram of the pulley mentioned by you.
Give reason for the following:
In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.
A pulley system has a velocity ratio 3. Draw a diagram showing the point of application and direction of load (L), effort (E) and tension (T). It lifts a load of 150 N by an effort of 60 N. Calculate its mechanical advantage. Is the pulley system ideal? Give reason.
State two reasons, why the efficiency of a pulley system is not 100 percent?
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.
If the weight of the movable pulley is W, obtain the expression for MA, VR, and efficiency.
