41. The temperature coefficient of a Zener diode changes from negative to positive :
(a) Below 5 V
(b) Above 6 V
(c) Between 5 V and 6 V
(d) Exactly at 0 V
42. A back diode :
(a) Is ordinary Zener diode
(b) Is used to rectify strong signals
(c) Conducts better in the forward than in the reverse directions
(d) Is used to rectify weak signals whose peak amplitudes are between 0.1 V and 0.7 V
43. ……….. utilizes the cumulative multiplication principle of carriers through field induced impact ionization.
(a) Zener diode
(b) Varactor diode
(c) PIN diode
(d) Avalanche diode
44. The major application of tunnel diode is :
(a) As voltage controllable device
(b) As switching device in digital circuits
(c) As oscillator
(d) As rectifier
45. In Schottky barrier diode, conduction is :
(a) Entirely by electrons
(b) Entirely by holes
(c) Mainly by electrons and partially by holes
(d) Mainly by holes and partially by electrons
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