Electronic Devices-Transistor Bias Circuits

Electronic Devices-Transistor Bias Circuits
11. The input resistance of the base of a voltage-divider biased transistor can be neglected
  • at all times.
  • only if the base current is much smaller than the current through R2 (the lower bias resistor).
  • at no time.
  • only if the base current is much larger than the current through R2 (the lower bias resistor).
Show Answer
12. Which transistor bias circuit arrangement provides good Q-point stability, but requires both positive and negative supply voltages?
  • base bias
  • collector-feedback bias
  • voltage-divider bias
  • emitter bias
Show Answer
13. Collector-feedback bias provides very poor stability with negative feedback from collector to base.
  • TRUE
  • FALSE
Show Answer
14. A transistor is operating in a linear fashion at saturation.
  • TRUE
  • FALSE
Show Answer
15. Base biasing is common in relay driver circuits.
  • TRUE
  • FALSE
Show Answer
16. A pnp transistor requires the same bias polarities as the npn transistor.
  • TRUE
  • FALSE
Show Answer
17. The purpose of biasing is to establish a proper Q-point.
  • TRUE
  • FALSE
Show Answer
18. The base bias circuit is not beta-dependent.
  • TRUE
  • FALSE
Show Answer
19. Collector-feedback bias is another name for base bias.
  • TRUE
  • FALSE
Show Answer
20. The input resistance at the base of a transistor is RIN DCIBRE.
  • TRUE
  • FALSE
Show Answer
Electronics
Questions and Answers for Competitive Exams Various Entrance Test