Electrical Material Engineering MCQs with Answers - Set 02 - ObjectiveBooks

Electrical Material Engineering MCQs with Answers - Set 02

Practice Test: Question Set - 02

1. The photoelectric effect occurs only when the incident light has more than a certain critical
    (A) Intensity
    (B) Speed
    (C) Frequency
    (D) Wave length

2. Due to which of the following reasons copper and aluminium are not used for heating elements?
    (A) Both have great tendency for oxidation
    (B) Both have low melting point
    (C) Very large length of wires will be required
    (D) All of the above

3. Which of the following material is not a semiconductor?
    (A) Silica
    (B) Germanium
    (C) Selenium
    (D) Gallium arsenide

4. A carbon resistor contains
    (A) Carbon crystals
    (B) Solid carbon granules
    (C) Pulverized coal
    (D) Finely divided carbon black

5. Overhead telephone wires are made of
    (A) Aluminium
    (B) Steel
    (C) ACSR conductors
    (D) Copper

6. ________ has zero temperature coefficient of resistance.
    (A) Aluminium
    (B) Carbon
    (C) Porcelain
    (D) Manganin

7. The transition temperature of mercury is
    (A) 18.0°K
    (B) 9.22°K
    (C) 4.12°K
    (D) 1.14°K

8. The value of critical field below the transition temperature will
    (A) Increase
    (B) Decrease
    (C) Remain unchanged
    (D) Any of the above

9. The coordination number of a simple cubic structure is
    (A) 2
    (B) 4
    (C) 6
    (D) 8

10. Commonly used conducting materials are
    (A) Copper
    (B) Aluminium
    (C) Both (A) and (B)
    (D) Copper and silver

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