Electrical Engineering Materials

1. _________ has zero temperature co-efficient of resistance.

1. Aluminium
2. Carbon
3. Porcelain
4. Manganin

View answer

2. _________ is most commonly used for making magnetic recording tape

1. Silver nitrate
2. Ferric oxide
3. Small particles of iron
4. Silicon-iron

View answer

3. _________ has the best damping properties.

1. Diamond
2. High speed steel
3. Mild steel
4. Cast iron

View answer

4. _________ is a hard solder.

1. Tin-lead
2. Tin-silver-lead
3. Copper-zinc
4. None of the above

View answer

5. _________ is an example of piezoelectric material.

1. Glass
2. Quartz
3. Corrundum
4. Neoprene

View answer

6. _________ is the main constituent of glass

1. Fe203
2. Si02
3. AI2O3
4. B2O3

View answer

7. A carbon resistor contains

1. carbon crystals
2. solid carbon granules
3. pulverized coal
4. finely divided carbon black.

View answer

8. A good electric contact material should have all of the following properties except

1. high resistivity
2. high resistance to corrosion
3. good thermal conductivity
4. high melting point

View answer

9. A perfect conductor has

1. zero conductivity
2. unity conductivity
3. infinite conductivity
4. none of the above

View answer

10. Addition of 0.3 to 4.5% silicon to iron _________ the electrical resistivity of iron.

1. increases
2. decreases
3. does not change
4. any of the above

View answer