Q. In a circuit with an inductor, what is the time constant defined as?
-
A.
L/R
-
B.
R/L
-
C.
L*R
-
D.
R+L
Solution
The time constant for an inductor is defined as L/R, where L is inductance and R is resistance.
Correct Answer:
A
— L/R
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Q. In a series RL circuit, what happens to the current when the voltage is suddenly applied?
-
A.
It instantly reaches maximum value
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B.
It increases linearly
-
C.
It increases exponentially
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D.
It remains constant
Solution
In a series RL circuit, the current increases exponentially due to the inductor's opposition to changes in current.
Correct Answer:
C
— It increases exponentially
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Q. In a series RL circuit, what is the phase relationship between voltage and current?
-
A.
Voltage leads current by 90 degrees
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B.
Current leads voltage by 90 degrees
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C.
Voltage and current are in phase
-
D.
Voltage lags current
Solution
In a series RL circuit, the voltage lags the current due to the inductive reactance.
Correct Answer:
D
— Voltage lags current
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Q. In a transformer, what role does the inductor play?
-
A.
It converts AC to DC
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B.
It stores energy
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C.
It transfers energy between circuits
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D.
It filters signals
Solution
In a transformer, the inductor transfers energy between circuits through electromagnetic induction.
Correct Answer:
C
— It transfers energy between circuits
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Q. What happens to the current through an inductor when the voltage is suddenly removed?
-
A.
It instantly drops to zero
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B.
It continues to flow for a short time
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C.
It reverses direction
-
D.
It increases indefinitely
Solution
Inductors resist changes in current, so when voltage is removed, the current continues to flow for a short time.
Correct Answer:
B
— It continues to flow for a short time
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Q. What happens to the energy stored in an inductor when the current through it is suddenly interrupted?
-
A.
It is dissipated as heat
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B.
It is stored indefinitely
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C.
It is released as a voltage spike
-
D.
It is converted to light
Solution
When the current through an inductor is interrupted, the energy is released as a voltage spike.
Correct Answer:
C
— It is released as a voltage spike
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Q. What is the behavior of an inductor at high frequencies?
-
A.
It acts as a short circuit
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B.
It acts as an open circuit
-
C.
It has no effect
-
D.
It increases resistance
Solution
At high frequencies, an inductor acts as an open circuit due to its reactance.
Correct Answer:
B
— It acts as an open circuit
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Q. What is the effect of increasing the number of turns in an inductor?
-
A.
Inductance decreases
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B.
Inductance remains the same
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C.
Inductance increases
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D.
Inductance becomes zero
Solution
Increasing the number of turns in an inductor increases its inductance.
Correct Answer:
C
— Inductance increases
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Q. What is the primary application of inductors in power supply circuits?
-
A.
Filtering
-
B.
Rectification
-
C.
Amplification
-
D.
Switching
Solution
Inductors are primarily used for filtering in power supply circuits.
Correct Answer:
A
— Filtering
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Q. What is the primary function of an inductor in a circuit?
-
A.
To store electrical energy in a magnetic field
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B.
To convert AC to DC
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C.
To amplify signals
-
D.
To rectify voltage
Solution
Inductors store electrical energy in a magnetic field when current flows through them.
Correct Answer:
A
— To store electrical energy in a magnetic field
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Q. What is the primary reason inductors are used in power supply circuits?
-
A.
To filter out high frequencies
-
B.
To store energy
-
C.
To regulate voltage
-
D.
To convert AC to DC
Solution
Inductors are used in power supply circuits primarily to store energy.
Correct Answer:
B
— To store energy
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Q. What is the primary use of a choke inductor?
-
A.
To filter out high-frequency signals
-
B.
To amplify signals
-
C.
To rectify AC voltage
-
D.
To store energy
Solution
Choke inductors are primarily used to filter out high-frequency signals in power supplies.
Correct Answer:
A
— To filter out high-frequency signals
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Q. What is the time constant for an RL circuit defined as?
-
A.
L/R
-
B.
R/L
-
C.
L*R
-
D.
1/(L*R)
Solution
The time constant for an RL circuit is defined as L/R, where L is inductance and R is resistance.
Correct Answer:
A
— L/R
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Q. What type of inductor is commonly used in RF applications?
-
A.
Air core inductor
-
B.
Iron core inductor
-
C.
Ferrite core inductor
-
D.
Water core inductor
Solution
Air core inductors are commonly used in RF applications due to their low losses.
Correct Answer:
A
— Air core inductor
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Q. Which of the following components is typically used to oppose changes in current?
-
A.
Capacitor
-
B.
Resistor
-
C.
Inductor
-
D.
Diode
Solution
Inductors oppose changes in current due to their property of inductance.
Correct Answer:
C
— Inductor
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Q. Which of the following describes the behavior of an inductor in a DC circuit after a long time?
-
A.
It acts as a short circuit
-
B.
It acts as an open circuit
-
C.
It stores energy
-
D.
It dissipates energy
Solution
After a long time in a DC circuit, an inductor acts as a short circuit.
Correct Answer:
A
— It acts as a short circuit
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Q. Which of the following is a key characteristic of inductors?
-
A.
They have a high resistance to AC signals
-
B.
They oppose changes in current
-
C.
They can only be used in DC circuits
-
D.
They have no effect on frequency
Solution
Inductors oppose changes in current due to their property of inductance.
Correct Answer:
B
— They oppose changes in current
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Q. Which type of inductor is designed to operate at high frequencies?
-
A.
Air core inductor
-
B.
Iron core inductor
-
C.
Ferrite core inductor
-
D.
Variable inductor
Solution
Ferrite core inductors are designed to operate efficiently at high frequencies.
Correct Answer:
C
— Ferrite core inductor
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