logo

CuriousTab

CuriousTab

Discussion

Home ‣ Electrical Engineering ‣ Magnetism and Electromagnetism See What Others Are Saying!
  • Question

  • What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?


  • Options
  • A. 2,400 At
  • B. 240 At
  • C. 24 At
  • D. 2.4 At

  • Correct Answer
  • 24 At 

    • More questions

    • 1. An RC high-pass filter consists of an 820 Ω resistor. What is the value of C so that Xc is ten times less than R at an input frequency of 12 kHz?

    • Options
    • A. 81 µF
    • B. 161 µF
    • C. 0.161 µF
    • D. 220 µF
      • Discuss
    • 2. Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is

    • Options
    • A. 16.54 V
    • B. 1.65 V
    • C. 10.60 V
    • D. 5.93 V
      • Discuss
    • 3. To derive 18 V and 12 V from a 24 V supply requires a voltage divider with three taps.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is

    • Options
    • A. 40 Hz
    • B. 100 Hz
    • C. 400 Hz
    • D. indeterminable
      • Discuss
    • 5. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of

    • Options
    • A. 0.0045 s
    • B. 2 ms
    • C. 1.5 ms
    • D. 3,000 µs
      • Discuss
    • 6. Referring to Problem 8, assume the input voltage is 15 V dc. What is the output voltage?

    • Options
    • A. 0 V
    • B. 15 V
    • C. 7.07 V
    • D. 10.6 V
      • Discuss
    • 7. A 12 V battery is connected across a series combination of 68 Ω, 47 Ω, 220 Ω, and 33 Ω. The amount of current is

    • Options
    • A. 326 mA
    • B. 16.3 mA
    • C. 32.6 mA
    • D. 163 mA
      • Discuss
    • 8. A practical voltage source has a nonzero internal resistance.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. When these numbers are added, (87 × 105) + (2.5 × 106), the result is

    • Options
    • A. 1.12 × 104
    • B. 11.2 × 105
    • C. 112 × 105
    • D. 1,120 × 106
      • Discuss
    • 10. Total current in an RL circuit always lags the source voltage.

    • Options
    • A. True
    • B. False
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.