Electrical Engineering Materials(Electrical Engineering ) Questions and Answers

Question 1. The tiny block formed by the arrangement of a small group of atoms is called the
  1.    Unit cell
  2.    Space lattice
  3.    Either A or B
  4.    None of the above
Explanation:-
Answer: Option A. -> Unit cell
Question 2. Which of the following variety of copper has the best conductivity ?
  1.    Induction hardened copper
  2.    Hard drawn copper
  3.    Pure annealed copper
  4.    Copper containing traces of silicon
Explanation:-
Answer: Option C. -> Pure annealed copper
Question 3. Piezoelectric materials serve as a source of ________ .
  1.    Resonant waves
  2.    Musical waves
  3.    Microwaves
  4.    Ultrasonic waves
Explanation:-
Answer: Option D. -> Ultrasonic waves
Question 4. On which of the following factors does the resistivity of a material depend ?
  1.    Resistance of the conductor
  2.    Area of the conductor section
  3.    Length of the conductor
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 5. The number of atoms per unit cell in B.C.C. structure is
  1.    1
  2.    2
  3.    4
  4.    8
Explanation:-
Answer: Option B. -> 2
Question 6. A carbon resistor contains
  1.    Carbon crystals
  2.    Solid carbon granules
  3.    Pulverized coal
  4.    Finely divided carbon black.
Explanation:-
Answer: Option D. -> Finely divided carbon black.
Question 7. Which of the following material is not a semiconductor ?
  1.    Silica
  2.    Germanium
  3.    Selenium
  4.    Gallium-arsenide
Explanation:-
Answer: Option A. -> Silica
Question 8. Platinum is used in
  1.    Electrical contacts
  2.    Thermocouple
  3.    Heating element in high temperature furnace
  4.    Grids of special purpose vacuum tubes
  5.    All of the above
Explanation:-
Answer: Option E. -> All of the above
Question 9. The forbidden gap in an insulator is
  1.    Large
  2.    Small
  3.    Nil
  4.    Any of the above
Explanation:-
Answer: Option A. -> Large
Question 10. Which of the following materials is preferred for transmitting electrical energy over long distance ?
  1.    Copper
  2.    Aluminium
  3.    Steel reinforced copper
  4.    Steel reinforced aluminium
Explanation:-
Answer: Option D. -> Steel reinforced aluminium
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