Diode - Diode objective questions and answers

31. The best value of rectification efficiency for a half wave rectifier could be around

   A.40 percent

   B.55 percent

   C.80 percent

   D.95 percent

32. When bias applied to a vari-cap diode is increased its capacitance

   A.Remains constant

   B.Is increased

   C.Is decreased

   D.First increases and then decreases

33. A reverse-biased P-N junction has

   A.All most zero current

   B.A net electron current

   C.A net hole current

   D.A very narrow depletion layer

34. A phototube is an electronic tube

   A.That is used in TV sets for producing picture on the screen

   B.Whose resistance decreases as its cathode is exposed to more light

   C.Which is used for producing a briliant flash of light for taking photographs in the dark

   D.That emits photoelectrons when its cathode is illuminated

35. A zener diode when biased correctly

   A.Never overheats

   B.Acts as a fixed resistance

   C.Has a constant voltage across it

   D.Has a constant current passing through it

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