Electrical Engineering Materials MCQ Questions - Set 04 - ObjectiveBooks

Electrical Engineering Materials MCQ Questions - Set 04

Practice Test: Question Set - 04

1. Which of the following resistive materials has the lowest temperature coefficient of resistance?
    (A) Nichrome
    (B) Constantan
    (C) Kanthal
    (D) Molybdenum

2. Piezoelectric materials serve as a source of ________.
    (A) Resonant waves
    (B) Musical waves
    (C) Microwaves
    (D) Ultrasonic waves

3. Thermionic emission occurs in
    (A) Vacuum tubes
    (B) Copper conductors
    (C) Ferrite cores
    (D) Transistors

4. The conductivity of a metal is determined by
    (A) The electronic concentration and the mobility of the free electrons
    (B) The number of valence electrons per atom
    (C) Either (A) or (B)
    (D) None of the above

5. Which of the following high resistance materials has the highest operating temperature?
    (A) Kanthal
    (B) Manganin
    (C) Nichrome
    (D) Eureka

6. Which of the following materials is the best conductor of electricity?
    (A) Tungsten
    (B) Aluminium
    (C) Copper
    (D) Carbon

7. The forbidden gap in an insulator is
    (A) Large
    (B) Small
    (C) Nil
    (D) Any of the above

8. The current due to electron flow in conduction band is the hole current in valence band.
    (A) Equal to
    (B) Less than
    (C) Greater than
    (D) Any of the above

9. The converse of hardness is known as
    (A) Malleability
    (B) Toughness
    (C) Softness
    (D) None of the above

10. The superconductivity is due to
    (A) The crystal structure having no atomic vibration at 0°K
    (B) All electrons interact in the superconducting state
    (C) The electrons jump into nucleus at 0°K
    (D) None of the above

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