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- Question
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
Options- A. 219 kΩ
- B. 66 kΩ
- C. 660 kΩ
- D. 1.3 MΩ
- Correct Answer
- 660 kΩ
- 1. A 320 µH coil is in series with a 3.3 kΩ resistor. How long does it take for current to build up to its full value?
Options- A. 0.48 s
- B. 0.48 ms
- C. 0.48 µs
- D. 48 s Discuss
- 2. A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
Options- A. is increased
- B. is decreased
- C. does not change
- D. momentarily goes to zero Discuss
- 3. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of
Options- A. 0.0045 s
- B. 2 ms
- C. 1.5 ms
- D. 3,000 µs Discuss
- 4. A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
Options- A. 25 kHz
- B. 12 kHz
- C. 18 kHz
- D. 1.3 MHz Discuss
- 5. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is
Options- A. 40 Hz
- B. 100 Hz
- C. 400 Hz
- D. indeterminable Discuss
- 6. The inductance of an iron-core coil decreases if
Options- A. the number of turns is decreased
- B. the iron core is removed
- C. the length of the coil decreases
- D. none of the above Discuss
- 7. Two inductors, L1 and L2, are in parallel. L1 has a value of 25 µH and L2 a value of 50 µH. The parallel combination is in series with L3, a 20 µH coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is
Options- A. 87 mA
- B. 870 mA
- C. 87 A
- D. 337 mA Discuss
- 8. Three 15 mH inductors are in series. The total inductance is
Options- A. 15 mH
- B. 30 mH
- C. 45 mH
- D. 5 mH Discuss
- 9. The following coils are in parallel: 75 µH, 40 µH, 25 µH, and 15 µH. The total inductance is approximately
Options- A. 6.9 µH
- B. 14 µH
- C. 2.2 µH
- D. 155 µH Discuss
- 10. A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
Options- A. 91 mA
- B. 78 mA
- C. 57 mA
- D. 400 mA Discuss
Inductors problems
Search Results
Correct Answer: 0.48 µs
Correct Answer: is increased
Correct Answer: 0.0045 s
Correct Answer: 12 kHz
Correct Answer: 400 Hz
Correct Answer: the number of turns is decreased
Correct Answer: 870 mA
Correct Answer: 45 mH
Correct Answer: 6.9 µH
Correct Answer: 78 mA
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