Discussion
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- Question
As per temperature limits, the number of categories of solid dielectrics are
Options- A. 7
- B. 6
- C. 8
- D. 5
- Correct Answer
- 7
- 1. If Bmax is the maximum flux density, eddy current loss is proportional to
Options- A. Bmax
- B. B1.6max
- C. B2max
- D. B3max Discuss
- 2. As the viscosity of a liquid increases, the relaxation time
Options- A. remains constant
- B. increases
- C. decreases
- D. first decreases then increases Discuss
- 3. At room temperature the number of conducting electrons in an intrinsic semiconductor
Options- A. is almost equal to the number of valence electrons
- B. is about half the number of valence electrons
- C. is small as compared to the number of valence electrons
- D. is a very small fraction of the number of valence electrons Discuss
- 4. For magnetic shielding, we need a ferromagnetic material.
Options- A. True
- B. False Discuss
- 5. Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called
Options- A. Debye temperature
- B. Curie temperature
- C. Neel temperature
- D. Transition temperature Discuss
- 6. If the radius of electron cloud around the nucleus of a rare gas atom is R, the electronic polarizability of the atom is porportional to
Options- A. R
- B. R2
- C. R3
- D.
Discuss
- 7. If Bmax is the maximum flux density, hysteresis loss is proportional to
Options- A. Bmax
- B. B1.6max
- C. B2max
- D. B3max Discuss
- 8. Many compounds also exhibit semiconducting properties.
Options- A. True
- B. False Discuss
- 9. An atom of a rare gas is placed is an electric field E. Then
Options- A. the nucleus will be shifted in the direction of E by an amount which is proportional to E.
- B. the nucleus will not be shifted.
- C. the nucleus will be shifted in the direction of E by an amount which is independent of E.
- D. the nucleus will be shifted in a direction opposite to that of E. Discuss
- 10. Assertion (A): A capacitor with imperfect dielectric can be represented by a capacitance in parallel with resistance.
Reason (R): For imperfect dielectrics, dielectric constant has real and imaginary parts.
Options- A. Both A and R are true and R is correct explanation of A
- B. Both A and R are true but R is not correct explanation of A
- C. A is true but R is false
- D. A is false but R is true Discuss
Materials and Components problems
Search Results
Correct Answer: Bmax
Correct Answer: increases
Explanation:
Relaxation time increases with viscosity.
Correct Answer: is a very small fraction of the number of valence electrons
Correct Answer: True
Correct Answer: Debye temperature
Correct Answer: R3
Explanation:
Since (?r - 1) = 4p NR3, electronic polarizability ? R3.
Correct Answer: B1.6max
Correct Answer: True
Correct Answer: the nucleus will be shifted in the direction of E by an amount which is proportional to E.
Explanation:
For equilibrium nucleus is shifted in the direction of E by an amount which is proportional to E.
Correct Answer: Both A and R are true and R is correct explanation of A
Explanation:
Imaginary part of dielectric constant is responsible for dielectric losses.
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