Electrical Engineering Materials

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

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

Correct answer: (D)
Manganin

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

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

Correct answer: (B)
Ferric oxide

3. _________ has the best damping properties.

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

Correct answer: (D)
Cast iron

4. _________ is a hard solder.

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

Correct answer: (C)
Copper-zinc

5. _________ is an example of piezoelectric material.

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

Correct answer: (B)
Quartz

6. _________ is the main constituent of glass

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

Correct answer: (B)
Si02

7. A carbon resistor contains

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

Correct answer: (D)
finely divided carbon black.

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

Correct answer: (A)
high resistivity

9. A perfect conductor has

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

Correct answer: (C)
infinite conductivity

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

Correct answer: (A)
increases

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