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Q: A machine is said to be reversible when the .....
  • A. load gets lowered on the application of the effort
  • B. load gets highered on the removal of the effort
  • C. load gets highered on the application of the effort
  • D. load gets lowered on the removal of the effort
Correct Answer: Option D - Reversible machine–It is said to be reversible when the load (W) gets lowered on the removal of the effort. In such a case, work is done by the machine in reverse direction. Irreversible machine–It is said to be irreversible when the load (W) does not fall down on the removal of the effort. In such a case, work is not done in the reverse direction. The machines having efficiency less than 50% are irreversible or self-locking, whereas, machines having efficiency greater than 50% are said to be reversible.
D. Reversible machine–It is said to be reversible when the load (W) gets lowered on the removal of the effort. In such a case, work is done by the machine in reverse direction. Irreversible machine–It is said to be irreversible when the load (W) does not fall down on the removal of the effort. In such a case, work is not done in the reverse direction. The machines having efficiency less than 50% are irreversible or self-locking, whereas, machines having efficiency greater than 50% are said to be reversible.

Explanations:

Reversible machine–It is said to be reversible when the load (W) gets lowered on the removal of the effort. In such a case, work is done by the machine in reverse direction. Irreversible machine–It is said to be irreversible when the load (W) does not fall down on the removal of the effort. In such a case, work is not done in the reverse direction. The machines having efficiency less than 50% are irreversible or self-locking, whereas, machines having efficiency greater than 50% are said to be reversible.