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Materials and Components problems
1. 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
Show Answer
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Discuss
Correct Answer:
n, m, l
2. Which of these has lowest dielectric strength?
Options
A. Dry air
B. Wet air
C. Cotton
D. Paper
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Correct Answer: Wet air
Explanation:
Cotton and paper have higher dielectric strength than air. Moisture decreases dielectric strength.
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
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Correct Answer: refined mineral oil
4. 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
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Correct Answer: increases
5. For a superconductor, magnetisation M in a field H is
Options
A. extremely small
B. - H
C. - I
D. zero
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Correct Answer: - H
6. As per Curie-Weiss law, the magnetic susceptibility of a material varies as
Options
A. T
-2
B.
C. T
D. T
2
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Correct Answer:
7. 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
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Correct Answer: decreases transition temperature
8. The resistance of a superconductor is
Options
A. low
B. very low
C. very very low
D. zero
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Correct Answer: zero
9. 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
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Correct Answer: 0.5
10. If ?
r
= ?
r
'
-
j
?
r
"
tan ? =
.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
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.