# Electronics - Inductors

### Exercise :: Inductors - General Questions

22.

What is the inductive reactance if the Q of a coil is 60, and the winding resistance is 5 ?

 A. 0.083 B. 12 C. 30 D. 300 Explanation:

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23.

The time difference, or lag, between flux density and magnetizing force is known as:

 A. eddy current B. magnetic saturation C. hysteresis D. coercivity

Explanation:

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24.

A magnetic circuit breaker will open to protect equipment only when:

 A. voltage is exceeded B. an open is in the equipment C. the equipment is operating properly D. current is exceeded

Explanation:

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25.

Electromagnetic induction is the generation of:

 A. electricity from magnetism B. electricity from electricity C. magnetism from electricity D. magnetism from magnetism

Explanation:

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26.

Inductance is:

 A. directly proportional to the length of the coil B. directly proportional to the number of turns on the coil C. inversely proportional to the cross-sectional area of the coil D. inversely proportional to the permeability

Explanation:

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27.

Current will cause a magnetic field in a conductor as follows:

 A. An ac current causes a fixed polarity magnetic field. B. A dc current causes a fixed polarity magnetic field. C. A dc current causes an alternating magnetic field. D. An ac current causes a fixed polarity magnetic field and a dc current causes an alternating magnetic field.

Explanation:

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28.

What is the total inductance, assuming no mutual inductance? A. 12 mH B. 6 mH C. 0.73 mH D. 0 mH