Discussion
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- Question
Five inductors are connected in series. The lowest value is 8 ?H. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is
Options- A. 8 H
- B. 32 ?H
- C. 64 ?H
- D. 248 ?H
- Correct Answer
- 248 ?H
- 1. A 240 µH inductor is equivalent to a
Options- A. 0.240 mH inductor
- B. 0.000240 mH inductor
- C. 240 mH inductor
- D. 240 H inductor Discuss
- 2. An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then
Options- A. VR ? VL
- B. VL < VR
- C. VL = VR
- D. VL > VR Discuss
- 3. An inductor, a 1 kΩ resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is
Options- A. 0 V
- B. 6 V
- C. 12 V
- D. 4 V Discuss
- 4. When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
Options- A. increases
- B. decreases
- C. remains the same
- D. doubles Discuss
- 5. A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is
Options- A. 9.9 mH
- B. greater than 5 mH
- C. 9.9 mH or greater than 5 mH
- D. less than 0.6 mH Discuss
- 6. The winding resistance of a coil can be increased by
Options- A. increasing the number of turns
- B. using a thinner wire
- C. changing the core material
- D. increasing the number of turns or using thinner wire Discuss
- 7. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field
Options- A. is quartered
- B. quadruples
- C. doubles
- D. does not change Discuss
- 8. An inductance of 0.43 mH is smaller than
Options- A. 43 µH
- B. 430 µH
- C. 0.05 H
- D. 0.00043 H Discuss
- 9. A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is
Options- A. 55 mH
- B. less than 0.2 mH
- C. less than 5.5 mH
- D. 5.5 mH Discuss
- 10. The voltage across a coil when di/dt = 20 mA/µs and L = 8 µH is
Options- A. 16 mV
- B. 160 mV
- C. 1.6 mV
- D. 2.5 mV Discuss
Inductors problems
Search Results
Correct Answer: 0.240 mH inductor
Correct Answer: VL > VR
Correct Answer: 6 V
Correct Answer: decreases
Correct Answer: less than 0.6 mH
Correct Answer: increasing the number of turns or using thinner wire
Correct Answer: is quartered
Correct Answer: 0.05 H
Correct Answer: 5.5 mH
Correct Answer: 160 mV
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