Inductors problems
- 1. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
Options- A. 1.8 mV
- B. 18 mV
- C. 180 mV
- D. 1.25 mV Discuss
Correct Answer: 18 mV
- 2. An inductance of 0.08 µH is larger than
Options- A. 0.0000008 H
- B. 0.000000008 H
- C. 0.000008 H
- D. 0.00008 mH Discuss
Correct Answer: 0.000000008 H
- 3. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
Options- A. good
- B. open
- C. shorted
- D. partly shorted Discuss
Correct Answer: shorted
- 4. Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. An induced voltage is produced as a result of a dc voltage.
Options- A. True
- B. False Discuss
Correct Answer: False
- 6. Inductance is the property of an inductor that produces an opposition to any change in current.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. XL is directly proportional to frequency and inductance.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
Some factors that affect the inductance of a coil include:
1. The inductance is proportional to the square of the number of turns;
2. The inductance increases directly as the permeability of the core material increases;
3. The inductance increases directly as the cross-sectional area increases; and
4. The inductance decreases as its length increases.
1. The inductance is proportional to the square of the number of turns;
2. The inductance increases directly as the permeability of the core material increases;
3. The inductance increases directly as the cross-sectional area increases; and
4. The inductance decreases as its length increases.
- 9. The permeability of a core material is an indication of the ability of the material to establish a magnetic field.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. Inductors add in parallel.
Options- A. True
- B. False Discuss
Correct Answer: False
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