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Electronic Principles problems


  • 1. If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point

  • Options
  • A. down
  • B. up
  • C. nowhere
  • D. off the load line
  • E. None of the above
  • Discuss
  • 2. Which one of the following statements is true for the voltages in a series RL circuit?

  • Options
  • A. The total voltages is equal to the sum of the voltages across the resistance and inductance
  • B. The voltage always has the same amplitude and phase for every part of the circuit
  • C. The total voltage is less than the sum of the voltages across the resistance and inductance
  • D. The total voltage lags the total current by less than 90
  • E. None of the above
  • Discuss
  • 3. Doubling the operating frequency of an inductive circuit:

  • Options
  • A. has no effect on the inductive reactance
  • B. doubles the amount of inductive reactance
  • C. multiplies the inductive reactance by 6.28
  • D. cuts the inductive reactance in half
  • E. None of the above
  • Discuss
  • 4. A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

  • Options
  • A. 3 V
  • B. 16 V
  • C. 7.5 V
  • D. 8 V
  • E. None of the above
  • Discuss
  • 5. If a load resistance is 1 kW, a stiff voltage source has a resistance of

  • Options
  • A. At least 10 Ohm
  • B. less than 10 Ohm
  • C. More than 100 k Ohm
  • D. Less than 100 k Ohm
  • E. None of the above
  • Discuss
  • 6. Positive ions are atoms that have

  • Options
  • A. Gained a proton
  • B. Lost a proton
  • C. Gained an electron
  • D. Lost an electron
  • E. None of the above
  • Discuss
  • 7. What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?

  • Options
  • A. 100 Ohm
  • B. Less than 1 Ohm
  • C. 628 Ohm
  • D. 444 Ohm
  • E. None of the above
  • Discuss
  • 8. A typical light switch in your home is a:

  • Options
  • A. knife switch
  • B. toggle switch
  • C. rotary switch
  • D. momentary push button switch
  • E. None of the above
  • Discuss
  • 9. A device that converts thermal energy to electrical energy is called a:

  • Options
  • A. thermocouple
  • B. solar cell
  • C. chemical cell
  • D. piezoelectric devices
  • E. None of the above
  • Discuss
  • 10. A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding?

  • Options
  • A. 50 A
  • B. 12 A
  • C. 5 A
  • D. 20 A
  • E. None of the above
  • Discuss

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