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  • Question
  • As current travels within a conductor:


  • Options
  • A. the magnetic field aids the current
  • B. a magnetic field is developed around it
  • C. the wire tries to point north
  • D. an electrostatic field opposes the current

  • Correct Answer
  • a magnetic field is developed around it 


  • Inductors problems


    Search Results


    • 1. A value of "ten to the eighth power magnetic lines of force" is for the term:

    • Options
    • A. field
    • B. flux
    • C. coulomb
    • D. weber
    • Discuss
    • 2. What type of device consists of a coil with a moveable iron core?

    • Options
    • A. solenoid
    • B. reed switch
    • C. relay
    • D. armature
    • Discuss
    • 3. Inductance is:

    • Options
    • A. directly proportional to the length of the coil
    • B. directly proportional to the number of turns on the coil
    • C. inversely proportional to the cross-sectional area of the coil
    • D. inversely proportional to the permeability
    • Discuss
    • 4. Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?

    • Options
    • A. The coil windings must be the same.
    • B. coil 1
    • C. The coil ratio is too small.
    • D. coil 2
    • Discuss
    • 5. When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:

    • Options
    • A. multiple-tapped secondary
    • B. center-tapped secondary
    • C. multiple winding secondary
    • D. single winding secondary
    • Discuss
    • 6. What is the total inductance assuming no mutual inductance?


    • Options
    • A. 0 mH
    • B. 0.69 mH
    • C. 12 mH
    • D. 24 mH
    • Discuss
    • 7. What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?

    • Options
    • A. 500 ohms
    • B. 1000 ohms
    • C. 1414 ohms
    • D. 2000 ohms
    • Discuss
    • 8. What is the maximum source current for a transformer rated at 10 kVA, 1000/500 60 Hz?

    • Options
    • A. 2 A
    • B. 5 A
    • C. 10 A
    • D. 20 A
    • Discuss
    • 9. 

      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
    • 10. 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


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