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प्रश्न
Answer the following in short.
Mention any two methods by which we can take care of machines.
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उत्तर
Taking care of machines: Some of the ways in which machines should be cared for are given below.
- Machines should be kept in a clean environment, which is free from dust and moisture.
- When not in use, machines should be kept covered to prevent the collection of dust on them.
- Machines made of iron should be protected from rust by coating them with paint.
- The moving parts of a machine should be regularly oiled with good-quality machine oil to reduce friction and wear and tear.
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संबंधित प्रश्न
State whether the following statement is True or False.
A boy does work while pushing a wall.
What is the principle on which a machine works?
The correct relationship between the mechanical advantage (M.A.), the velocity ratio (V.R.) and the efficiency (n) is ______.
Give an example of the following uses of a machine:
to obtain gain in speed
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)?
Establish a relationship between efficiency, M.A., and V.R.
Classify the following as a lever, a pulley and an inclined plane:
A staircase
What is a lever?
Why is this so traveller’s bags have wheels?
Why is this so machines have to be maintained?
