Discussion
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- Question
How long until the current is at a maximum?
Options- A. 0 µs
- B. 5 µs
- C. 15 µs
- D. 25 µs
- Correct Answer
- 5 µs
- 1. In a purely inductive circuit,
Options- A. current leads voltage by 90°
- B. voltage lags current by 90°
- C. voltage leads current by 90°
- D. voltage and current are in phase (0°) Discuss
- 2. What is the phase angle between the source voltage and current, when a 100 mH inductor with a reactance of 6 kΩ, and a 1 kΩ resistor are in series with a source?
Options- A. 0.1 degrees
- B. 9.0 degrees
- C. 61.0 degrees
- D. 81.0 degrees Discuss
- 3. Counter emf or induced voltage is:
Options- A. inversely proportional to the change in current
- B. directly proportional to the change in time
- C. directly proportional to the inductance in henrys
- D. inversely proportional to the inductance in henrys Discuss
- 4. A winding of wire can be called
Options- A. an inductor
- B. a coil
- C. a choke
- D. All of the above Discuss
- 5. A utility pole transformer used to supply a residential customer with two phases uses:
Options- A. two phases on the primary
- B. a center tap on the secondary
- C. a separate ground for each phase
- D. a small coefficient of coupling Discuss
- 6. In a transformer, what will happen to the primary current if the secondary magnetic field increases?
Options- A. Ip will increase.
- B. Ip will be canceled.
- C. Ip will remain the same.
- D. Ip will decrease. Discuss
- 7.
In the given circuit, what will the voltage be across R3 25 µs after the switch is moved to position 2?
Options- A. 2.88 V
- B. 5.9 V
- C. 8.34 V
- D. 14 V Discuss
- 8. What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 Ω, and the inductor is rated at 24 mH?
Options- A. 79.9 mA
- B. 126.4 mA
- C. 173.0 mA
- D. 198.6 mA Discuss
- 9. The electrical energy consumed by a coil is stored in the form of:
Options- A. an electrical field
- B. a force field
- C. an electrostatic field
- D. a magnetic field Discuss
- 10. When the transformer secondary is not loaded:
Options- A. secondary voltage increases
- B. no secondary current flows
- C. no secondary voltage is present
- D. secondary current increases Discuss
Inductors problems
Search Results
Correct Answer: voltage leads current by 90°
Correct Answer: 81.0 degrees
Correct Answer: directly proportional to the inductance in henrys
Correct Answer: All of the above
Correct Answer: a center tap on the secondary
Correct Answer: Ip will increase.
Correct Answer: 5.9 V
Correct Answer: 173.0 mA
Correct Answer: a magnetic field
Correct Answer: no secondary current flows
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