Electronic Devices and Circuit Theory- Bipolar Junction Transistors Questions and Answers

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Showing 10 of 19 questions
Q1
A transistor amplifier has a voltage gain of 100. If the input voltage is 75 mV, the output voltage is:
  • A 1.33 V
  • B 7.5 V
  • C 13.3 V
  • D 15 V
Answer: Option B
Q2
For normal operation of a pnp BJT, the base must be ________ with respect to the emitter and ________ with respect to the collector.
  • A positive, negative
  • B positive, positive
  • C negative, positive
  • D negative, negative
Answer: Option C
Q3
When a transistor is used as a switch, it is stable in which two distinct regions?
  • A saturation and active
  • B active and cutoff
  • C saturation and cutoff
  • D none of the above
Answer: Option C
Q4
The term BJT is short for
  • A base junction transistor.
  • B binary junction transistor.
  • C both junction transistor.
  • D bipolar junction transistor.
Answer: Option D
Q5
For a silicon transistor, when a base-emitter junction is forward-biased, it has a nominal voltage drop of
  • A 0.7 V.
  • B 0.3 V.
  • C 0.2 V.
  • D VCC.
Answer: Option A
Q6
Refer to Figure 4-3. The measured voltage, VCE, is 20 V. The transistor is in
  • A saturation.
  • B cutoff.
  • C normal.
  • D not enough data.
Answer: Option B
Q7
What are the two types of bipolar junction transistors?
  • A npn and pnp
  • B pnn and nnp
  • C ppn and nnp
  • D pts and stp
Answer: Option A
Q8
What is the order of doping, from heavily to lightly doped, for each region?
  • A base, collector, emitter
  • B emitter, collector, base
  • C emitter, base, collector
  • D collector, emitter, base
Answer: Option B
Q9
The magnitude of dark current in a phototransistor usually falls in what range?
  • A mA
  • B µA
  • C nA
  • D pA
Answer: Option C
Q10
Refer to Figure 4-3. You measure VCE and find it nearly equal to zero. You now know that the transistor is
  • A operating in cutoff.
  • B operating normally.
  • C operating in saturation.
  • D operating below cutoff.
Answer: Option C

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