Quiz  /  Valve Electronics Diode And Triode MCQ

  • 1. 
    Number of secondary electrons emitted per number of primary electrons depends on

  • Material of target
  • Frequency of primary electrons
  • Intensity
  • None of the above

  • 2. 
    In a diode, when there is saturation current, the plate resistance is

  • Zero
  • Infinite
  • Some finite quantity
  • Data is insufficient

  • 3. 
    For a given plate voltage the plate current in a triode is maximum when the potential of

  • 0.8 mA
  • 0.6 mA
  • 0.4 mA
  • 1 mA

  • 4. 
    The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by

  • The grid is positive and the plate is negative
  • The grid is positive and the plate is positive
  • The grid is zero and the plate is positive
  • The grid is negative and the plate is positive

  • 5. 
    The amplification produced by a triode is due to the action of

  • 10 volt
  • 4 volt
  • 40 volt
  • 100 volt

  • 6. 
    In a triode amplifier, the value of maximum gain is equal to

  • Filament
  • Cathode
  • Grid
  • plate

  • 7. 
    The voltage gain by the triode depends on

  • Half the amplification factor
  • Amplification factor
  • Twice the amplification factor
  • Infinity

  • 8. 
    In a triode valve

  • Filament voltage
  • Plate voltage
  • Plate resistance
  • Plate current

  • 9. 
    In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from 200 volt to 220 volt and the grid potential is decreased from 0.5 volt to 1.3 volt. The amplification factor of the valve is

  • If the grid voltage is zero then plate current will be zero
  • If the temperature of the filament is doubled, then the thermionic current will also be doubled.
  • If the temperature of the filament is doubled, then the thermionic current will nearly be four times
  • At a definite grid voltage, the plate current varies with plate voltage according to Ohm’s law
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