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प्रश्न
Select the correct alternative:
For an ideal machine, the efficiency is
पर्याय
greater than unity
less than unity
equal to unity
depends on the value of load
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उत्तर
equal to unity
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संबंधित प्रश्न
What do you understand by a machine?
Answer the following.
What is a machine?
State the kind of lever which always has mechanical advantage less than 1. Draw a labelled diagram of such a lever.
What is an inclined plane?
Fig show a system of four pulleys. The upper two pulleys are fixed and the lower two are movable.
(i) Draw a string around the pulleys. Also show the place and direction in which the effort is applied.
(ii) What is the velocity ratio of the system?
(iii) What is the mechanical advantage of the system?
(iv) What assumption do you make in arriving at your answer in part (iii)?
What is the efficiency of an ideal machine?
What is the efficiency of a machine?
Classify the following as a lever, a pulley and an inclined plane:
A wedge
Classify the following as a lever, a pulley and an inclined plane:
An axe
Why is this so machines have to be maintained?
