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GATE Previous Questions on Zener Diode

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GATE-2013

1)In the circuit shown below, the knee current of ideal zener diode is 10 mA. To maintain 5 volts across the load RL, the minimum value of RL in Ω’s and the minimum power rating of the zener diode in mW respectively are. Given V_z=5V

zd1

  1. 125 and 125
  2. 125 and 250
  3. 250 and 125
  4. 250 and 250

 

GATE 2004

2) In the voltage regulator shown, the load current can vary from 100 mA to 500 mA. Assuming that the zener diode is ideal (i.e. the zener knee current is negligibly small and zener resistance is zero in the breakdown region), the value of R is

zd2

 

GATE 1994

3) A Zener diode works on the principle of

  1. Tunneling of charge carriers across the junction
  2. Thermionic emission
  3. Diffusion of charge carriers across the junction
  4. Hopping of charge carriers across the junction

 

GATE 2006

4) In the circuit shown below , assume that Zener diode is ideal with a breakdown voltage V_z=6v. The waveform across load R looks like

zd3

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