Materials and Components problems
- 1. The class of insulation of impregnated paper is
Options- A. A
- B. B
- C. C
- D. F Discuss
Correct Answer: A
- 2. In body centred cubic structure, comers and centre of the cube are occupied by identical atoms.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. An iron specimen has µr = 1000 when B = 0.3 T. If B = 0.35 T, µr
Options- A. will be 1000
- B. will be less than 1000
- C. will be more than 1000
- D. may be more or less than 1000 Discuss
Correct Answer: may be more or less than 1000
- 4. If v is the velocity of electron, tc is the average time between collisions, the mean free path ? = vtc.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. The colour code on a carbon resistor is red-red-black-silver. The value of resistor is
Options- A. 22000 ?
- B. 2200 ?
- C. 22 ± 5% ?
- D. 22 ± 10% ? Discuss
Correct Answer: 22 ± 10% ?
- 6. The orientation polarization is
- directly proportional to temperature
- inversely proportional to temperature
- inversely proportional to square of permanent dipole moment
- directly proportional to square of permanent dipole moment.
Options- A. 1 and 3 only
- B. 2 and 3 only
- C. 1 and 4 only
- D. 2 and 4 only Discuss
Correct Answer: 2 and 4 only
- 7. To produce magnetic flux, mmf is necessary.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. In carbon resistor colour code, if the third band is of silver, it indicates
Options- A. that three zeros are to be added to indicate the resistance value
- B. multiplier is 0.01
- C. multiplier is 0.1
- D. tolerance is ± 5% Discuss
Correct Answer: multiplier is 0.01
- 9. Assertion (A): Ferromagnetic materials possess ferromagnetic properties only when temperature is less than paramagnetic curie temperature.
Reason (R): For a ferromagnetic material
for T > ?f.
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
Correct Answer: Both A and R are true and R is correct explanation of A
- 10. A liquid has N permanent dipoles ?p per unit volume and has been subjected to dc field for a long time such that orientation polarization is P0. At t = 0, the field is suddenly removed, then polarization
Options- A. will remain constant at P0
- B. will become zero at t = 0
- C. will delay to zero with a time constant
- D. either b or c Discuss
Correct Answer: will delay to zero with a time constant
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