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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 31 of 39 pages
Question 301. The developed electromagnetic force and or torque in electromechanical energy conversion system act in a direction that tends
  1.     to decrease the stored energy at constant mmf.
  2.     to increase the stored energy at constant flux.
  3.     to decrease the stored energy at constant flux.
  4.     to decrease the co-energy at constant mmf.
 Discuss Question
Answer: Option C. ->  to decrease the stored energy at constant flux.
Question 302. The heating time constant of an electrical machine gives an indication of its
  1.     short time rating.
  2.     rating.
  3.     cooling.
  4.     overload capacity.
 Discuss Question
Answer: Option C. ->  cooling.
Question 303. The operation of electric generators and motors depend on the intraction between magnetic field and
  1.      Electric current.
  2.     Electric fields.
  3.     Commutator.
  4.     Copper conductors.
 Discuss Question
Answer: Option A. ->   Electric current.
Question 304. If an electric current carrying coil is placed in a uniform magnetic field in the direction of magnetic induction, then
  1.     the net force is zero but torque is finite.
  2.     the net force is finite but torque is zero.
  3.     the net force and torque are both finite.
  4.     the net force and torque on the coil are both zero.
 Discuss Question
Answer: Option D. ->  the net force and torque on the coil are both zero.
Question 305. A conductor is rotating with in a magnetic field. At which of the positions do the peak voltages occur?
  1.     At an angle of 45° to the axis of the magnetic field.
  2.     Along the axis of the magnetic field.
  3.     Anywhere.
  4.     At right angles to the axis of the magnetic field.
 Discuss Question
Answer: Option B. ->  Along the axis of the magnetic field.
Question 306. In an inductor current cannot change abruptly. Comment on the statement.
  1.     True.
  2.     True partially.
  3.     False.
  4.     Cannot comment.
 Discuss Question
Answer: Option A. ->  True.
Question 307. A fan blade of length 2R rotates in a time period T in a magnetic field B. The induced voltage in the blade is proportional to
  1.     RBT.
  2.     2RBT.
  3.     R2B / T.
  4.     R2BT.
 Discuss Question
Answer: Option C. ->  R2B / T.
Question 308. The effective reactance of an inductive coil
  1.     remains same irrespective of the frequency.
  2.     none of these.
  3.     increases because of stray capacitance as the frequency increases.
  4.     decreases because of stray capacitance as the frequency increases.
 Discuss Question
Answer: Option D. ->  decreases because of stray capacitance as the frequency increases.
Question 309. Magnetic circuit with cross sectional area of 20 cm2 is to be operated at 50 Hz from 120 Vrms supply. The number of turns required to active a peak magnetic flux density of 1.8 T in the core flux is
  1.     150.
  2.     600.
  3.     300.
  4.     450.
 Discuss Question
Answer: Option A. ->  150.
Question 310. Fleming's right hand rule may be applied to an electric generator to find out the direction of
  1.     magnetic field.
  2.     induced emf.
  3.     rotor rotation.
  4.    None of these
 Discuss Question
Answer: Option B. ->  induced emf.

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