Materials And Components(Electrical Engineering ) Questions and Answers

Question 1. Which inductor is linear?
  1.    Air cored
  2.    Cast iron cored
  3.    Sheet steel cored
  4.    Iron alloy cored
Explanation:-
Answer: Option A. -> Air cored
Question 2. The materials which become polarized on the application of mechanical stress are called piezoelectric.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 3. Which inductor is used at high frequencies?
  1.    Cast iron cored
  2.    Sheet steel cored
  3.    Iron alloy cored
  4.    Ceramic cored
Explanation:-
Answer: Option D. -> Ceramic cored
Question 4. For making a capacitor it is better to have a dielectric having
  1.    High permittivity
  2.    Low permittivity
  3.    Permittivity same as that of air
  4.    Permittivity which is neither high nor low
Explanation:-
Answer: Option A. -> High permittivity
Question 5. As the viscosity of a liquid increases, the relaxation time
  1.    Remains constant
  2.    Increases
  3.    Decreases
  4.    First decreases then increases
Explanation:-
Answer: Option B. -> Increases
Question 6. When a material is in superconducting state and a magnetic field is applied
  1.    The superconducting property is not affected
  2.    The superconducting property may be affected and resistivity may increase from zero to a low value
  3.    The superconducting property may be destroyed
  4.    The material may become an insulator
Explanation:-
Answer: Option C. -> The superconducting property may be destroyed
Question 7. The dielectric losses do not depend on frequency.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 8. An atom of a rare gas is placed is an electric field E. Then
  1.    The nucleus will be shifted in the direction of E by an amount which is proportional to E.
  2.    The nucleus will not be shifted.
  3.    The nucleus will be shifted in the direction of E by an amount which is independent of E.
  4.    The nucleus will be shifted in a direction opposite to that of E.
Explanation:-
Answer: Option A. -> The nucleus will be shifted in the direction of E by an amount which is proportional to E.
Question 9. Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called
  1.    Debye temperature
  2.    Curie temperature
  3.    Neel temperature
  4.    Transition temperature
Explanation:-
Answer: Option A. -> Debye temperature
Question 10. A characteristic property of crystal is its periodicity of structure.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
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