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Inductors problems

  • 1. Electronics Inductors: If the switch i

    If the switch is moved to position 1 in the given circuit, how long will it take for the current to reach its maximum value?


  • Options
  • A. 72.5 µs
  • B. 532 µs
  • C. 610 µs
  • D. 833 µs
    • Discuss
  • 2. As a generator armature passes the 270 degree point, the induced voltage is:

  • Options
  • A. at maximum negative
  • B. between maximum negative and zero
  • C. at maximum positive
  • D. between zero and maximum positive
    • Discuss
  • 3. In a B-H curve, magnetizing force is equal to:

  • Options
  • A.
  • B. H = I × N
  • C. ampere-turns per weber
  • D. webers per square meter
    • Discuss
  • 4. When an electromagnet reaches maximum strength, it is considered to be:

  • Options
  • A. in field condition
  • B. at saturation
  • C. inhibited
  • D. at field strength
    • Discuss
  • 5. The four factors determining inductance are the number of turns, coil length, coil area, and:

  • Options
  • A. permeability
  • B. reluctance
  • C. counter emf
  • D. coefficient of coupling
    • Discuss
  • 6. If you wanted to decrease the inductance of a coil, you might increase the:

  • Options
  • A. number of turns
  • B. permeability of the core
  • C. spacing between turns
  • D. area of the coil
    • Discuss
  • 7. A 24 V peak source is connected across a 900 µH inductor. If the frequency of the source is 22 kHz, what is the reactive power?

  • Options
  • A. 2.3 VAR
  • B. 4.6 VAR
  • C. 9.3 VAR
  • D. 0 VAR
    • Discuss
  • 8. An inductor is in series with a voltage source, an open switch, and a resistor. The instant the switch is closed, the inductor acts like

  • Options
  • A. a short
  • B. an open
  • C. a resistor
  • D. a voltage source
    • Discuss
  • 9. A henry value divided by a circuit resistive value provides the:

  • Options
  • A. counter emf value
  • B. induced voltage amplitude
  • C. rise or decay time constant
  • D. quality factor of the coil
    • Discuss
  • 10. What is the name of the part inside a relay that is moved by the action of the electromagnet?

  • Options
  • A. armature
  • B. conductor
  • C. contacts
  • D. solenoid
    • Discuss

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