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MCQs

Total Questions : 149 | Page 2 of 15 pages
Question 11. Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 12. Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 13. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
  1.    1.8 mV
  2.    18 mV
  3.    180 mV
  4.    1.25 mV
 Discuss Question
Answer: Option B. -> 18 mV
Question 14. A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
  1.    Is increased
  2.    Is decreased
  3.    Does not change
  4.    Momentarily goes to zero
 Discuss Question
Answer: Option A. -> Is increased
Question 15. Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
  1.    219 kΩ
  2.    66 kΩ
  3.    660 kΩ
  4.    1.3 MO
 Discuss Question
Answer: Option C. -> 660 kΩ
Question 16. Energy is stored by an inductor in an electrostatic field.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 17. XL is directly proportional to frequency and inductance.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 18. All coil cores are made of iron.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 19. The term 'choke' is more commonly used in connection with an inductor used to block off high frequencies.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 20. A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
  1.    91 mA
  2.    78 mA
  3.    57 mA
  4.    400 mA
 Discuss Question
Answer: Option B. -> 78 mA

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