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Electronics
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Inductors
Comments
Question
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.
Correct Answer
A capacitance in parallel with the series combination of a resistance and an inductance
Inductors problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: passing of the higher frequencies
2. What is the permeability of transformer iron?
Options
A. 50
B. 450
C. 1,500
D. 5,500
Show Answer
Scratch Pad
Discuss
Correct Answer: 5,500
3. Opposition to current flow without the dissipation of energy is called:
Options
A. resistance
B. inductive reactance
C. counter emf
D. impedance
Show Answer
Scratch Pad
Discuss
Correct Answer: inductive reactance
4. Which of the following is NOT one of the three major types of fixed inductor?
Options
A. air core
B. ferrite core
C. magnesium core
D. iron core
Show Answer
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Discuss
Correct Answer: magnesium core
5. With 100 V
ac
applied to the primary of a transformer so that it draws 500 mA, what will be the 300 V
ac
secondary current?
Options
A. 1500 mA
B. 200 mA
C. 167 mA
D. 150 mA
Show Answer
Scratch Pad
Discuss
Correct Answer: 167 mA
6. 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
7. 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
Scratch Pad
Discuss
Correct Answer: 12 mH
8. 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
9. A magnetic field has:
Options
A. polar fields
B. lines of force
C. magnetomotive force
D. lines of reluctance
Show Answer
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Discuss
Correct Answer: lines of force
10. 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
Scratch Pad
Discuss
Correct Answer: 180 V
ac
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