Inductors and Inductance – Exercise – 1

21. 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?

(a) 219 kΩ
(b) 66 kΩ
(c) 660 kΩ
(d) 1.3 MΩ

Answer
Answer : (c)
Explanation
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22. 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 ________.

(a) 87 mA
(b) 870 mA
(c) 87 A
(d) 337 mA

Answer
Answer : (b)
Explanation
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23. An inductance of 0.43 mH is smaller than ________.

(a) 43 μH
(b) 430 μH
(c) 0.05 H
(d) 0.00043 H

Answer
Answer : (c)
Explanation
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