Electronics - Inductors

Exercise :: Inductors - General Questions

57. 

What is the current rise after 2 time constants if Vs = 12 V dc, R = 60 omega.gif, 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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