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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 5 of 39 pages
Question 41. A laminated iron core has reduced eddy-current losses because
  1.    More wire can be used with less D.C. resistance in coil
  2.    The laminations are insulated from each other
  3.    The magnetic flux is concentrated in the air gap of the core
  4.    The laminations are stacked vertically
 Discuss Question
Answer: Option B. -> The laminations are insulated from each other
Question 42. In case of an inductance, current is proportional to
  1.    Voltage across the inductance
  2.    Magnetic field
  3.    Both A and B
  4.    Neither A)nor B
 Discuss Question
Answer: Option B. -> Magnetic field
Question 43. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is
  1.    20 Wb
  2.    2 Wb
  3.    0.2 Wb
  4.    0.02 Wb
 Discuss Question
Answer: Option D. -> 0.02 Wb
Question 44. The law that the induced e.m.f. and current always oppose the cause producing them is due to
  1.    Faraday
  2.    Lenz
  3.    Newton
  4.    Coulomb
 Discuss Question
Answer: Option B. -> Lenz
Question 45. The magnitude of the induced e.m.f. in a conductor depends on the
  1.    Flux density of the magnetic field
  2.    Amount of flux cut
  3.    Amount of flux linkages
  4.    Rate of change of flux-linkages
 Discuss Question
Answer: Option D. -> Rate of change of flux-linkages
Question 46. A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly
  1.    50 N
  2.    120 N
  3.    240 N
  4.    480 N
 Discuss Question
Answer: Option B. -> 120 N
Question 47. A crack in the magnetic path of an inductor will result in
  1.    Unchanged inductance
  2.    Increased inductance
  3.    Zero inductance
  4.    Reduced inductance
 Discuss Question
Answer: Option D. -> Reduced inductance
Question 48. Lenz's law is a consequence of the law of conservation of
  1.    Induced current
  2.    Charge
  3.    Energy
  4.    Induced e.m.f.
 Discuss Question
Answer: Option C. -> Energy
Question 49. To produce an 800 Hz sine wave, a four-pole generator must be operated at
  1.    200 rps
  2.    400 rps
  3.    800 rps
  4.    1,600 rps
 Discuss Question
Answer: Option B. -> 400 rps
Question 50. Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?
  1.    Wave A leads wave B by 15°
  2.    Wave A lags wave B by 15°
  3.    Wave A leads wave B by 105°
  4.    Wave A lags wave B by 105°
 Discuss Question
Answer: Option A. -> Wave A leads wave B by 15°

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