Electronics - Inductors

Exercise :: Inductors - General Questions

29. 

During a current change, the ability of a conductor to produce counter emf within itself is called:

A. back emf
B. self-induction
C. a henry
D. impedance

Answer: Option B

Explanation:

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30. 

If the switch is moved to position 1 in the given circuit, how long will it take for the current to reach its maximum value?

A. 72.5 mu.gifs
B. 532 mu.gifs
C. 610 mu.gifs
D. 833 mu.gifs

Answer: Option B

Explanation:

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31. 

When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:

A. multiple-tapped secondary
B. center-tapped secondary
C. multiple winding secondary
D. single winding secondary

Answer: Option B

Explanation:

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32. 

A 24 V peak source is connected across a 900 mu.gifH inductor. If the frequency of the source is 22 kHz, what is the reactive power?

A. 2.3 VAR
B. 4.6 VAR
C. 9.3 VAR
D. 0 VAR

Answer: Option A

Explanation:

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33. 

What is the permeability of machine steel?

A. 1.1 x 10−4
B. 5.65 x 10−4
C. 6.9 x 10−3
D. 8.8 x 10−3

Answer: Option B

Explanation:

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34. 

What will happen when an inductor's magnetic field collapses?

A. Current will double.
B. Voltage will be induced.
C. A new field will expand.
D. Counter emf will be high.

Answer: Option B

Explanation:

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35. 

With a square wave input, an RL differentiator circuit with an output across the inductor will produce what type of waveform?

A. dc
B. short time-duration pulses
C. exponential-shaped pulses
D. only a phase shift

Answer: Option B

Explanation:

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