Quiz  /  FET(Field Effect Transistors) Class 8 MCQ Questions With Answers

  • 1. 
    A thyristor is triggered by a ...

  • negative pulse applied to the gate
  • negative pulse applied to the anode
  • positive pulse applied to the cathode
  • positive pulse applied to the gate

  • 2. 
    When a FET is conducting current the gate voltage may be ...

  • 0 V
  • greater than the threshold voltage but less than the supply
  • close to 0.7 V
  • between 0V and the threshold

  • 3. 
    The normal voltage difference between the base and the emitter is ...

  • 0 V
  • about 0.7 V
  • equal to the collector voltage
  • variable

  • 4. 
    Here is an experimental circuit. Plotting(the voltage between collector and emitter) against the base current is shown. The graph shows that as base current increases to ...

  • the voltage across R3 increases
  • is constant
  • the transistor is saturated
  • the voltage across R3 increases

  • 5. 
    A thyristor is not turned off by ...

  • short-circuiting anode to cathode
  • a negative pulse to the gate
  • turning off the power supply
  • interrupting the current through it

  • 6. 
    Over its operating range, the collector current of a transistor is directly proportional to ...

  • the change in base current
  • the collector voltage
  • the base current
  • the emitter voltage

  • 7. 
    A FET is used to convert ...

  • a small current to a larger current
  • a voltage to a current
  • a small current to a voltage
  • a small voltage to a larger voltage

  • 8. 
    In a thyristor half-wave rectifier the lamp can be switched on at any time ...

  • In the first half of the positive half-cycle
  • after the peak of the positive half-cycle
  • in the cycle
  • in the second half of the positive half-cycle

  • 9. 
    The current through a FET is ...

  • constant
  • much greater than the base current
  • greater than that through a BJT
  • proportional to the gate voltage
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