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Electronics
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Inductors
Comments
Question
What term is used to describe the action of magnetic flux from one circuit that cuts across the conductors of another circuit?
Options
A. self-inductance
B. rectification
C. mutual inductance
D. magnetism
Correct Answer
mutual inductance
Inductors problems
Search Results
1. When used as a filter, an inductor is
Options
A. placed in series with the load and aids any current changes
B. placed in parallel with the load and aids any current changes
C. placed in parallel with the load and opposes any current changes
D. placed in series with the load and opposes any current changes
Show Answer
Scratch Pad
Discuss
Correct Answer: placed in series with the load and opposes any current changes
2. A loaded transformer will achieve mutual induction when:
Options
A. secondary current increase causes a primary current decrease
B. primary current is increased by an increase in secondary current
C. primary current is decreased by an increase in secondary current
D. secondary current decrease causes a primary current increase
Show Answer
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Discuss
Correct Answer: primary current is increased by an increase in secondary current
3. What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 V
ac
at the secondary?
Options
A. 75 turns
B. 150 turns
C. 900 turns
D. 1920 turns
Show Answer
Scratch Pad
Discuss
Correct Answer: 150 turns
4. The polarity of induced voltage while a field is collapsing is:
Options
A. independent of the force creating it
B. opposite to the force creating it
C. identical to the force creating the field
D. present only if the force is stationary
Show Answer
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Discuss
Correct Answer: opposite to the force creating it
5. On a schematic, dashed lines between two vertical coils usually mean the transformer has:
Options
A. an air core
B. an iron core
C. a nonmetallic core
D. a ferrite core
Show Answer
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Discuss
Correct Answer: a ferrite core
6. Find V
R
and V
L
.
Options
A. V
R
= 41.6 V, V
L
= 78.4 V
B. V
R
= 48 V, V
L
= 110 V
C. V
R
= 56 V, V
L
= 106 V
D. V
R
= 60 V, V
L
= 60 V
Show Answer
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Discuss
Correct Answer: V
R
= 56 V, V
L
= 106 V
7. Faraday's law states that the:
Options
A. direction of the induced voltage produces an opposition
B. direction of an induced current produces an aiding effect
C. emf depends on the rate of cutting flux
D. emf is related to the direction of the current
Show Answer
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Discuss
Correct Answer: emf depends on the rate of cutting flux
8. A transformer is used:
Options
A. to couple electric energy from one dc circuit to another
B. to couple electric energy from an ac circuit to a dc circuit
C. to couple electric energy from a dc circuit to an ac circuit
D. to couple electric energy from one ac circuit to another
Show Answer
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Discuss
Correct Answer: to couple electric energy from one ac circuit to another
9. The unit of flux density is:
Options
A. magnetomotive force
B. a weber
C. a maxwell
D. a tesla
Show Answer
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Discuss
Correct Answer: a tesla
Explanation:
tesla or weber/m2 is the unit of flux density
10. The time difference, or lag, between flux density and magnetizing force is known as:
Options
A. eddy current
B. magnetic saturation
C. hysteresis
D. coercivity
Show Answer
Scratch Pad
Discuss
Correct Answer: hysteresis
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