Discussion
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- Question
As per Curie-Weiss law, the magnetic susceptibility of a material varies as
Options- A. T-2
- B.
- C. T
- D. T2
- Correct Answer
-
- 1. For a superconductor, magnetisation M in a field H is
Options- A. extremely small
- B. - H
- C. - I
- D. zero Discuss
- 2. Resistivity of copper is lower than that of nickel. When a small percentage of copper is added to nickel, the resistivity
Options- A. increases
- B. decreases
- C. may increase or decrease
- D. remains the same Discuss
- 3. Transformer oil is
Options- A. refined vegetable oil
- B. refined mineral oil
- C. mixture of vegetable and mineral oil
- D. none of the above Discuss
- 4. Which of these has lowest dielectric strength?
Options- A. Dry air
- B. Wet air
- C. Cotton
- D. Paper Discuss
- 5. The quantum numbers associated with electron motion are designed as
Options- A. a, b, c
- B. h, k, l
- C. n, m, l
- D. h, n, l Discuss
- 6. The application of magnetic field to superconducting material
Options- A. increases transition temperature
- B. decreases transition temperature
- C. has no effect on transition temperature
- D. may increase or decrease the transition temperature Discuss
- 7. The resistance of a superconductor is
Options- A. low
- B. very low
- C. very very low
- D. zero Discuss
- 8. In Fermi-Dirac statistics, the probability of electron occupation of an energy level equal to Fermi level is
Options- A. 0
- B. 0.25
- C. 0.5
- D. 1 Discuss
- 9. If ?r = ?r' - j?r" tan ? =
.
Options- A. True
- B. False Discuss
- 10. The maximum temperature limit of class B insulation is
Options- A. 90°C
- B. 105°C
- C. 120°C
- D. 130°C Discuss
Materials and Components problems
Search Results
Correct Answer: - H
Correct Answer: increases
Correct Answer: refined mineral oil
Correct Answer: Wet air
Explanation:
Cotton and paper have higher dielectric strength than air. Moisture decreases dielectric strength.
Correct Answer: n, m, l
Correct Answer: decreases transition temperature
Correct Answer: zero
Correct Answer: 0.5
Correct Answer: True
Correct Answer: 130°C
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