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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 2 of 39 pages
Question 11. Increasing the field or increasing the current will decrease the force on the conductor.
  1.    Yes
  2.    No
 Discuss Question
Answer: Option B. -> No
Question 12. Which of the fpllowing inductor will have the least eddy current losses ?
  1.    Air core
  2.    Laminated iron core
  3.    Iron core
  4.    Powdered iron core
 Discuss Question
Answer: Option A. -> Air core
Question 13. A moving magnetic field will produce the same effect as a conductor that is moving.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 14. A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?
  1.    0.01 s
  2.    0.1 s
  3.    0.5 s
 Discuss Question
Answer: Option C. -> 0.5 s
Question 15. A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
  1.    50 ohms
  2.    500 ohms
  3.    1000 ohms
  4.    5000 ohms
 Discuss Question
Answer: Option D. -> 5000 ohms
Question 16. For a purely inductive circuit which of the following is true?
  1.    Apparent power is zero
  2.    Relative power is zero
  3.    Actual power of the circuit is zero
  4.    Any capacitance even if present in the circuit will not be charged
 Discuss Question
Answer: Option C. -> Actual power of the circuit is zero
Question 17. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be
  1.    3 mH
  2.    12 mH
  3.    24 mH
  4.    48 mH
 Discuss Question
Answer: Option A. -> 3 mH
Question 18. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be
  1.    6 mH
  2.    146 mH
  3.    24 mH
  4.    48 mH
 Discuss Question
Answer: Option D. -> 48 mH
Question 19. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
  1.    64 A/s
  2.    32 A/s
  3.    16 A/s
  4.    4 A/s
 Discuss Question
Answer: Option D. -> 4 A/s
Question 20. Which of the following circuit element stores energy in the electromagnetic field?
  1.    Inductance
  2.    Condenser
  3.    Variable resistor
  4.    Resistance
 Discuss Question
Answer: Option A. -> Inductance

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