Maintenance of Machines

Q. Why is maintenance of a machine necessary?

1. Parts of a machine get soiled.
2. Friction increases within the parts over time.
3. Efficiency of machine increases over time.
4. Wear and tear of parts occur in a machine.

Q.

The substance that helps to ---- friction are called lubricants.

1. Increase

2. Reduce

3. Create

4. None of these

Q.

Explain how the painting of an iron gate prevents it from rusting?

Q. To reduce friction, the movable parts of machines must be periodically ________.

1. lubricated
2. painted
3. washed
4. (b) and (c) above.

Q. Why is it important to maintain machines in daily life?

Q. Why are Machines oiled from time to time?

Q.

What is the best way to prevent a screwdriver from rusting when not in use.

Q.

Lubricating and polishing are the methods to increase friction.

1. True
2. False

Q.

Which of the following statements about a lubricant is correct?

1. It increases friction between two surfaces.

2. It reduces friction between two surfaces.

3. It increases heat between two surfaces.

4. It reduces heat between two surfaces.

Q. Which one of the following should be done to prevent a machine from rusting?

1. Cleaning the machine with a paper
2. Painting the machine
3. Washing the machine with water
4. Clean it with hydrochloric acid

Q. To avoid within the parts of a machine, is applied.

1. friction
2. paint
3. gravitational pull
4. oil

Q. Why are Machines oiled from time to time?

Q. Screw is not a force multiplier.

1. False
2. True

Q.

A hand truck is used to move boxes in a store. Which simple machines are part of the hand truck?

1. Lever, wheel and axle

2. Pulley and lever

3. Pulley and wheel

4. Pulley

Q.

The irregular surfaces decrease the friction.

1. True
2. False

Q. To reduce friction, the movable parts of machines must be periodically

1. lubricated
2. painted
3. washed
4. scraped

Q. To reduce friction, the movable parts of machines must be periodically________.

1. lubricated
2. painted
3. washed
4. scraped