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  • Question

  • The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?


  • Options
  • A. 3.54 mH
  • B. 7.88 mH
  • C. 39.9 mH
  • D. 189.3 mH

  • Correct Answer
  • 39.9 mH 

    • More questions

    • 1. What procedure should be followed when troubleshooting with an ammeter or voltmeter?

    • Options
    • A. Short the leads and adjust.
    • B. Check the meter's external power supply.
    • C. Start with the highest scale and adjust down to a lower scale.
    • D. Start with the lowest scale and adjust up to a higher scale.
      • Discuss
    • 2. Voltage-divider bias provides:

    • Options
    • A. an unstable Q point
    • B. a stable Q point
    • C. a Q point that easily varies with changes in the transistor's current gain
    • D. a Q point that is stable and easily varies with changes in the transistor's current gain
      • Discuss
    • 3. Kirchhoff's voltage law states that:

    • Options
    • A. the sum of the voltage drops in a series circuit is equal to the total applied voltage
    • B. the algebraic sum of the resistances is equal to the sum of the voltages
    • C. the algebraic sum of the individual currents around a closed loop is zero
    • D. the voltages developed across each element in a series circuit are identical
      • Discuss
    • 4. Clampers are often called peak detectors.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A transformer that has 700 turns in the primary and 35 turns in the secondary has a turns ratio of 20:1.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The operands in an addition operation consist of the augend and the addend.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. In a BJT, the collector current is approximately equal to the base current.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A sine wave has:

    • Options
    • A. four quadrants
    • B. two alternations
    • C. one period
    • D. all of the above
      • Discuss
    • 9. The greater the selectivity, the wider the bandwidth.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The unit of magnetic flux density is the weber.

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

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