Materials And Components(Engineering > Electrical Engineering ) Questions and Answers

Question 1. 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 2. 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 3. The materials which become polarized on the application of mechanical stress are called piezoelectric.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 4. 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 5. 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 6. The dielectric losses do not depend on frequency.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 7. A characteristic property of crystal is its periodicity of structure.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
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. The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as
  1.    Matthiessen’s rule
  2.    Debye rule
  3.    Curie rule
  4.    Onne’s rule
Explanation:-
Answer: Option A. -> Matthiessen’s rule
Question 10. 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
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