Specifications

QUESTIONS

Part - A

Choose the Correct Answer (1 Mark)

1. To transfer power without much loss of power, the conductor material should be

A) Very light B) very strong

C) have very low resistance D) have very low weight.

2. Copper is very widely used in electrical wires because,

(i) It has high conductivity, (ii) it has high tensile strength, (iii) It is very flexible, (iv) it is good

conductor of heat.

A) (i) (iii) & (iv) B) (i),(ii),(iii) C) (ii), (iii)& (iv) D) (i), (ii) & (iv)

3. Enameled wire has very thin coating of varnish over copper or aluminium wire. This

thin layer of coating acts as

A) protective coating against rusting B) protective coating against heat

C) protective coating of insulation D) coating to give good appearance

4. Enamel covering on the conductor wires cannot withstand for long the effects of

A) current B) voltage C) moisture D) certain solvents

5. Stranded wires are

A) thick wires B) thin wire

C) bundle of thin wires D) insulated cables.

Part - B

Answer the following questions in one or two words (1 Mark)

1. Which property allows the material to be drawn into thin wires?

2. Which type of copper conductor is called hard copper?

3. Where aluminmum conductors are widely used?

4. Which one has higher resistivity for the given length. Copper or Aluminium?

5. For a given amount of conductor length if the copper is said to have 100 % conductivity,

what would be conductivity of aluninium conductor of similar dimensions?

6. What is the expected service life in hours of the wire for the given temperature class?