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Electronics
‣
Inductors
Comments
Question
A magnetic field has:
Options
A. polar fields
B. lines of force
C. magnetomotive force
D. lines of reluctance
Correct Answer
lines of force
Inductors problems
Search Results
1. When a rate of one ampere per second causes an induced voltage of one volt, the unit of measure is
Options
A. a lenz
B. an ohm
C. a farad
D. a henry
Show Answer
Scratch Pad
Discuss
Correct Answer: a henry
2. What is the total inductance, assuming no mutual inductance?
Options
A. 12 mH
B. 6 mH
C. 0.73 mH
D. 0 mH
Show Answer
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Discuss
Correct Answer: 12 mH
3. What is magnetic flux?
Options
A. the number of lines of force in webers
B. the number of lines of force in maxwells
C. the number of lines of force in teslas
D. the number of lines of force in flux density
Show Answer
Scratch Pad
Discuss
Correct Answer: the number of lines of force in webers
4. Which of the following represents a true equivalent of an inductor?
Options
A. An inductance in series with a resistance and a capacitance
B. A capacitance in parallel with the series combination of a resistance and an inductance
C. An inductance in parallel with the series combination of a resistance and a capacitance
D. The only quality a real inductor has is inductance.
Show Answer
Scratch Pad
Discuss
Correct Answer: A capacitance in parallel with the series combination of a resistance and an inductance
5. A series RL filter circuit with an output across the inductor will result in what type of filtering?
Options
A. passing of the higher frequencies
B. passing of the lower frequencies
C. blocking of the higher frequencies
D. blocking of a certain range of frequencies
Show Answer
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Discuss
Correct Answer: passing of the higher frequencies
6. If 360 V
ac
is the output of a 300-turn secondary winding, what is the input voltage when the primary winding has 150 turns?
Options
A. 2.4 V
ac
B. 150 V
ac
C. 180 V
ac
D. 720 V
ac
Show Answer
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Discuss
Correct Answer: 180 V
ac
7. What happens when moving expanding lines of force encounter a conductor?
Options
A. Current increases.
B. Voltage is induced.
C. Resistance is reduced.
D. Power is increased.
Show Answer
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Discuss
Correct Answer: Voltage is induced.
8. Find I
R
and I
L
.
Options
A. I
R
= 50 mA, I
L
= 109 mA
B. I
R
= 150 mA, I
L
= 9 mA
C. I
R
= 50 mA, I
L
= 151 mA
D. I
R
= 150 mA, I
L
= 53 mA
Show Answer
Scratch Pad
Discuss
Correct Answer: I
R
= 150 mA, I
L
= 53 mA
9. Which two values are plotted on a B-H curve graph?
Options
A. reluctance and flux density
B. permeability and reluctance
C. magnetizing force and permeability
D. flux density and magnetizing force
Show Answer
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Discuss
Correct Answer: flux density and magnetizing force
10. A utility pole transformer used to supply a residential customer with two phases uses:
Options
A. two phases on the primary
B. a center tap on the secondary
C. a separate ground for each phase
D. a small coefficient of coupling
Show Answer
Scratch Pad
Discuss
Correct Answer: a center tap on the secondary
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