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Electronics
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Inductors
Comments
Question
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
Correct Answer
magnesium core
Inductors problems
Search Results
1. 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
2. What is hysteresis?
Options
A. lead between cause and effect
B. lag between cause and effect
C. lead between voltage and current
D. lag between voltage and current
Show Answer
Scratch Pad
Discuss
Correct Answer: lag between cause and effect
3. A transformer will have:
Options
A. primary and secondary windings
B. primary and secondary current
C. primary wattage producing secondary current
D. different frequencies for the primary and secondary
Show Answer
Scratch Pad
Discuss
Correct Answer: primary and secondary windings
4. A turns ratio of 5 for a transformer implies:
Options
A. more primary turns than secondary turns
B. more secondary current than primary current
C. larger source impedance than load impedance
D. more secondary turns than primary turns
Show Answer
Scratch Pad
Discuss
Correct Answer: more secondary turns than primary turns
5. What are the properties that determine the inductance of a coil?
Options
A. Length of wire, number of turns, type of core material, length of core
B. Number of turns, type of wire, length of core, and cross-sectional area of core
C. Type of core material, number of turns, cross-sectional area of core, and length of core
D. Type of core material, type of wire, number of turns, and cross-sectional area of core
Show Answer
Scratch Pad
Discuss
Correct Answer: Type of core material, number of turns, cross-sectional area of core, and length of core
6. 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
7. What is the permeability of transformer iron?
Options
A. 50
B. 450
C. 1,500
D. 5,500
Show Answer
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Discuss
Correct Answer: 5,500
8. 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
9. 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
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Discuss
Correct Answer: A capacitance in parallel with the series combination of a resistance and an inductance
10. 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
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