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 omega.gif?

A. 0.083 omega.gif
B. 12 omega.gif
C. 30 omega.gif
D. 300 omega.gif

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

25. 

Electromagnetic induction is the generation of:

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

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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.

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

28. 

What is the total inductance, assuming no mutual inductance?

mcq8_1030_1.gif

A. 12 mH
B. 6 mH
C. 0.73 mH
D. 0 mH

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.