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

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

   A.Bridge

   B.Half

   C.Centre-tap full wave

   D.None of the above

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

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

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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