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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 34 of 39 pages
Question 331. The coefficient of coupling between two air core coils depends on
  1.    None of the listed here
  2.    Mutual inductance between two coils only
  3.    Self-inductance of two coils only
  4.    Mutual inductance and self inductance of two coils
 Discuss Question
Answer: Option D. -> Mutual inductance and self inductance of two coils
Question 332. In case of an inductance, current is proportional to
  1.    Voltage across the inductance
  2.    Both of the listed here
  3.    None of the listed here
  4.    Magnetic field
 Discuss Question
Answer: Option D. -> Magnetic field
Question 333. Which of the fpllowing inductor will have the least eddy current losses ?
  1.    Powdered iron core
  2.    Iron core
  3.    Laminated iron core
  4.    Air core
 Discuss Question
Answer: Option D. -> Air core
Question 334. 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.    0.1 s
  2.    None of the listed here
  3.    0.5 s
  4.    0.2 s
 Discuss Question
Answer: Option C. -> 0.5 s
Question 335. A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
  1.    100 ohms
  2.    5000 ohms
  3.    500 ohms
  4.    1000 ohms
 Discuss Question
Answer: Option B. -> 5000 ohms
Question 336. For a purely inductive circuit which of the following is true?
  1.    Relative power is zero
  2.    Actual power of the circuit is zero
  3.    Any capacitance even if present in the circuit will not be charged
  4.    Apparent power is zero
 Discuss Question
Answer: Option B. -> Actual power of the circuit is zero
Question 337. 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
  1.    28 mH
  2.    12 mH
  3.    24 mH
  4.    3 mH
 Discuss Question
Answer: Option D. -> 3 mH
Question 338. Which of the following circuit element stores energy in the electromagnetic field?
  1.    Resistance
  2.    Inductance
  3.    Variable resistor
  4.    Condenser
 Discuss Question
Answer: Option B. -> Inductance
Question 339. 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.    24 mH
  2.    6 mH
  3.    12 mH
  4.    48 mH
 Discuss Question
Answer: Option D. -> 48 mH
Question 340. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be
  1.    16 A/s
  2.    20 A/s
  3.    12 A/s
  4.    4 A/s
 Discuss Question
Answer: Option D. -> 4 A/s

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