emf

mcqspedia.com has 5 Question/Answers about Topic emf

Michael Faraday observed that EMF was set up in a conductor in year of

Michael Faraday observed that EMF was set up in a conductor in year of
  • A. 1831
  • B. 1832
  • C. 1840
  • D. 1842
  • Correct Answer: Option A

Back EMF is 120 V when motor is turning at 1680 revs per min. back EMF when motor rotates at 3360 revs per min, will be

Back EMF is 120 V when motor is turning at 1680 revs per min. back EMF when motor rotates at 3360 revs per min, will be
  • A. 220 V
  • B. 240 V
  • C. 260 V
  • D. 280 V
  • Correct Answer: Option B

An EMF of 5.6 V is induced in a coil while current in coil is decreased from 100 A to 20 A in 0.02 s, its mutual induction will be

An EMF of 5.6 V is induced in a coil while current in coil is decreased from 100 A to 20 A in 0.02 s, its mutual induction will be
  • A. None
  • B. None
  • C. None
  • D. None
  • Correct Answer: Option A

Whenever magnetic flux linked with a coil changes, induced EMF in circuit will change

Whenever magnetic flux linked with a coil changes, induced EMF in circuit will change
  • A. for a short time
  • B. for a long time
  • C. forever
  • D. as long as change in flux
  • Correct Answer: Option D

Square coil of side 16 cm having 200 turns rotating in magnetic field of 0.05 T with peak EMF of 12 V will produce angular velocity of

Square coil of side 16 cm having 200 turns rotating in magnetic field of 0.05 T with peak EMF of 12 V will produce angular velocity of
  • A. None
  • B. None
  • C. None
  • D. None
  • Correct Answer: Option A