Q. What is the reactance of an inductor in an AC circuit with frequency f? (2023)
A.
2πfL
B.
1/(2πfL)
C.
L/(2πf)
D.
0
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Solution
The reactance of an inductor in an AC circuit is given by the formula X_L = 2πfL.
Correct Answer: A — 2πfL
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Q. What is the relationship between the frequency and the inductive reactance in an AC circuit? (2022)
A.
Directly proportional
B.
Inversely proportional
C.
No relation
D.
Exponential relation
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Solution
Inductive reactance is directly proportional to the frequency of the AC source.
Correct Answer: A — Directly proportional
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Q. What is the relationship between the number of turns in the primary and secondary coils of a transformer and the voltages across them? (2023)
A.
V_p/V_s = N_p/N_s
B.
V_p/V_s = N_s/N_p
C.
V_p = V_s
D.
V_p + V_s = 0
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Solution
The relationship is given by V_p/V_s = N_p/N_s, where V is voltage and N is the number of turns.
Correct Answer: A — V_p/V_s = N_p/N_s
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Q. What is the role of a capacitor in an AC circuit? (2023)
A.
Stores energy
B.
Dissipates energy
C.
Generates energy
D.
None of the above
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Solution
A capacitor stores energy in an AC circuit.
Correct Answer: A — Stores energy
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Q. What is the role of a transformer in an AC circuit? (2023)
A.
To convert AC to DC
B.
To increase or decrease voltage
C.
To store energy
D.
To measure current
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Solution
A transformer is used to increase or decrease voltage in an AC circuit.
Correct Answer: B — To increase or decrease voltage
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Q. Which law states that the induced electromotive force (emf) in a closed loop is equal to the negative rate of change of magnetic flux through the loop? (2022)
A.
Faraday's Law
B.
Lenz's Law
C.
Ohm's Law
D.
Ampere's Law
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Solution
Faraday's Law states that the induced emf in a closed loop is equal to the negative rate of change of magnetic flux through the loop.
Correct Answer: A — Faraday's Law
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Q. Which law states that the induced electromotive force is proportional to the rate of change of magnetic flux? (2022)
A.
Faraday's Law
B.
Lenz's Law
C.
Ohm's Law
D.
Ampere's Law
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Solution
Faraday's Law of electromagnetic induction states that the induced electromotive force in any closed circuit is equal to the rate of change of magnetic flux through the circuit.
Correct Answer: A — Faraday's Law
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Q. Which law states that the induced EMF in a circuit is proportional to the rate of change of magnetic flux through the circuit? (2022)
A.
Faraday's Law
B.
Lenz's Law
C.
Ohm's Law
D.
Ampere's Law
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Solution
Faraday's Law states that the induced EMF is proportional to the rate of change of magnetic flux.
Correct Answer: A — Faraday's Law
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Q. Which law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop? (2022)
A.
Faraday's Law
B.
Lenz's Law
C.
Ohm's Law
D.
Ampere's Law
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Solution
Faraday's Law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop.
Correct Answer: A — Faraday's Law
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Q. Which of the following devices operates on the principle of electromagnetic induction? (2019)
A.
Electric motor
B.
Generator
C.
Transformer
D.
All of the above
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Solution
All of the above devices operate on the principle of electromagnetic induction.
Correct Answer: D — All of the above
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Q. Which of the following devices uses electromagnetic induction? (2019)
A.
Electric motor
B.
Battery
C.
Resistor
D.
Capacitor
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Solution
An electric motor uses electromagnetic induction to convert electrical energy into mechanical energy.
Correct Answer: A — Electric motor
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Q. Which of the following devices uses the principle of electromagnetic induction? (2022)
A.
Transformer
B.
Resistor
C.
Capacitor
D.
Diode
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Solution
A transformer uses the principle of electromagnetic induction to transfer electrical energy between circuits.
Correct Answer: A — Transformer
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Q. Which of the following is a practical application of electromagnetic induction? (2019)
A.
Electric generator
B.
Resistor
C.
Capacitor
D.
Diode
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Solution
Electric generators utilize electromagnetic induction to convert mechanical energy into electrical energy.
Correct Answer: A — Electric generator
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