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Question
Select the correct alternative:
A pulley is used because of it
Options
has the mechanical advantage greater than one
has 100% efficiency
helps to apply the force in a convenient direction
requires more effort to raise a less load.
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Solution
helps to apply the force in a convenient direction
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RELATED QUESTIONS
State whether the following statement is True or False.
A pulley changes the direction of force.
Explain the working of a gear system.
Give reason for the following:
In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.
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.
What is a block and tackle system of pulleys?
There is no gain in mechanical advantage in the case of a single fixed pulley. Explain, why the pulley is then used?
In the case of a block and tackle arrangement, the mechanical advantage increases with the number of pulleys. Explain.
If the weight of the movable pulley is W, obtain the expression for MA, VR, and efficiency.
A pulley system has a velocity ratio of 4 and an efficiency of 90%. Calculate:
(i) the mechanical advantage of the system.
(ii) the effort required to raise a load of 300 N by the system.
_______ is a machine made up of wheel and rope.
