Diode - Diode objective questions and answers


26. The current in reverse bias, in a P-N junction diode may be,


   A.Few micro or nano amperes

   B.Few miliamperes

   C.Between 0.2 A and 2 A

   D.None of the above


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A.Few micro or nano amperes

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27. ..... rectifier needs four diodes.


   A.Bridge

   B.Half

   C.Centre-tap full wave

   D.None of the above


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A.Bridge

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28. In LED, light is emitted because


   A.Light falls on LED3

   B.Diode emits light when heated

   C.Recombination of charges takes place

   D.Any of the above


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C.Recombination of charges takes place

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29. The effect used in LED (Light Emitting Diode) is


   A.Radiative combination

   B.Formation of phonons

   C.Energy transfer

   D.Energy transfer from one electron to another when excited electron reverts from conduction


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A.Radiative combination

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30. The best value of rectification efficiency for a full wave (unfiltered) rectifier could be around


   A.50 percent

   B.65 percent

   C.80 percent

   D.95 percent


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C.80 percent

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