EMI & AC - Electromagnetic Induction

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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
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
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
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
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
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
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
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
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
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
Q. Which of the following devices uses electromagnetic induction? (2019)
  • A. Electric motor
  • B. Battery
  • C. Resistor
  • D. Capacitor
Q. Which of the following devices uses the principle of electromagnetic induction? (2022)
  • A. Transformer
  • B. Resistor
  • C. Capacitor
  • D. Diode
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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