# Electronics - Inductors

### Exercise :: Inductors - General Questions

57.

What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 , and the inductor is rated at 24 mH?

 A. 79.9 mA B. 126.4 mA C. 173.0 mA D. 198.6 mA

Answer: Option C

Explanation:

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58.

What is the total inductance of a 5 H and a 100 mH coil connected in parallel?

 A. 4.76 mH B. 33.3 mH C. 98.0 mH D. 150.0 mH

Answer: Option C

Explanation:

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59.

A transformer is used:

 A. to couple electric energy from one dc circuit to another B. to couple electric energy from an ac circuit to a dc circuit C. to couple electric energy from a dc circuit to an ac circuit D. to couple electric energy from one ac circuit to another

Answer: Option D

Explanation:

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60.

Which of the following is NOT one of the three major types of fixed inductor?

 A. air core B. ferrite core C. magnesium core D. iron core

Answer: Option C

Explanation:

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61.

What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?

 A. 500 ohms B. 1000 ohms C. 1414 ohms D. 2000 ohms

Answer: Option C

Explanation:

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62.

What is remanence?

 A. reactance B. reluctance C. retentitivity D. resistance

Answer: Option C

Explanation:

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63.

When an electromagnet reaches maximum strength, it is considered to be:

 A. in field condition B. at saturation C. inhibited D. at field strength

Answer: Option B

Explanation:

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