PN Junction Diode Quiz | PN Junction Diode Objective Type Questions and Answers

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Questions
21 The depletion region of a PN junction is one that is depleted of
A Mobile charges
B Immobile charges
C Atoms
D None of the above

Answer: Mobile charges
22 A reverse-biased PN junctions has
A Almost zero current
B A very narrow depletion layer
C A net electron current
D A net hole current

Answer: Almost zero current
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23 The main reason why electrons can tunnel through a PN junction is that
A Depletion layer is extremely thin
B Impurity level is low
C They have high energy
D Barrier potential is very low

Answer: Depletion layer is extremely thin
24 In a reverse biased PN junction, the current through the junction increases abruptly at
A Breakdown voltage
B 0.72 V
C 0.5 V
D 1.1 V

Answer: Breakdown voltage
25 As a PN junction is forward biased
A The depletion region decreases
B The barrier tends to breakdown
C Holes as well as electrons tend to drift away from the junction
D None of the above

Answer: The depletion region decreases
26 PN junction failure below 5 V is caused primarily by
A Avalanche breakdown
B Zener breakdown
C Either of (a) and (b) above
D None of the above

Answer: Zener breakdown
27 A PN junction
A Conducts in forward direction only
B Has high resistance in forward as well as reverse directions
C Has low resistance in forward as well as reverse directions
D Conducts in reverse direction only

Answer: Conducts in forward direction only
28 A PN junction is said to be forward biased when
A Positive terminal of the battery is connected to P-side and the negative side to the N-side
B Junction is earthed
C N-side is connected directly to the p-side
D Positive terminal of the battery is connected to N-side and the negative side to the P-side

Answer: Positive terminal of the battery is connected to P-side and the negative side to the N-side
29 In a PN junction when the applied voltage overcomes the ........ potential, the diode current is large, which is known as .............
A Barrier, forward bias
B Resistance, reverse bias
C Depletion, negative bias
D Reverse, reverse bias

Answer: Barrier, forward bias
30 When a PN junction is reverse-biased
A Holes and electrons tend to concentrate towards the junction
B The barrier tends to break down
C Holes and electrons tend to move away from the junction
D None of the above

Answer: Holes and electrons tend to move away from the junction
31 When PN junction is in forward bias, by increasing the battery voltage
A Current through P-N junction increases
B Current through P-N junction decreases
C Circuit resistance increases
D None of the above happens

Answer: Current through P-N junction increases
32 In an unbiased PN junction
A The junction current is due to minority carriers only
B The junction current at equilibrium is zero as equal but opposite carriers are crossing the junction
C The junction current reduces with rise in temperature
D The junction current at equilibrium is zero as charges do not cross the junction

Answer: The junction current at equilibrium is zero as equal but opposite carriers are crossing the junction
33 In a PN junction with no external voltage, the electric field between acceptor and donor ions is called a
A Barrier
B Threshold
C Peak
D Path

Answer: Barrier
34 In a PN junction the potential barrier is due to the charges on either side of the junction, these charges are
A Majority carriers
B Minority carriers
C Both (a) and (b)
D Fixed donor and acceptor ions

Answer: Fixed donor and acceptor ions
35 Diode characteristic curve is a plot between
A current and time
B voltage and time
C voltage and current
D both a and b

Answer: voltage and current

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