Semiconductor Diode(Electrical Engineering ) Questions and Answers

Question 1. If the a.c. input to a half-wave rectifier is an r.m.s value of $$\frac{{400}}{{\sqrt 2 }}$$   volts, then diode PIV rating is ___________
  1.    $$\frac{{400}}{{\sqrt 2 }}{\text{ V}}$$
  2.    400 V
  3.    $$400 \times \sqrt 2 {\text{ V}}$$
  4.    None of the above
Explanation:-
Answer: Option B. -> 400 V
Question 2. When a crystal diode is used as a rectifier, the most important consideration is ___________
  1.    forward characteristic
  2.    doping level
  3.    reverse characteristic
  4.    PIC rating
Explanation:-
Answer: Option D. -> PIC rating
Question 3. When the graph between current through and voltage across a device is a straight line, the device is referred to as ___________
  1.    linear
  2.    active
  3.    nonlinear
  4.    passive
Explanation:-
Answer: Option A. -> linear
Question 4. The PIV rating of each diode in a bridge rectifier is ___________ that of the equivalent centre-tap rectifier
  1.    one-half
  2.    the same as
  3.    twice
  4.    four times
Explanation:-
Answer: Option A. -> one-half
Question 5. The knee voltage of a crystal diode is approximately equal to ___________
  1.    applied voltage
  2.    breakdown voltage
  3.    forward voltage
  4.    barrier potential
Explanation:-
Answer: Option D. -> barrier potential
Question 6. A zener diode is ___________ device
  1.    a non-linear
  2.    a linear
  3.    an amplifying
  4.    none of the above
Explanation:-
Answer: Option A. -> a non-linear
Question 7. A zener diode utilizes ___________ characteristics for its operation.
  1.    forward
  2.    reverse
  3.    both forward and reverse
  4.    none of the above
Explanation:-
Answer: Option B. -> reverse
Question 8. ___________ rectifier has the lowest forward resistance
  1.    solid state
  2.    vacuum tube
  3.    gas tube
  4.    none of the above
Explanation:-
Answer: Option A. -> solid state
Question 9. The leakage current in a crystal diode is due to ___________
  1.    minority carriers
  2.    majority carriers
  3.    junction capacitance
  4.    none of the above
Explanation:-
Answer: Option A. -> minority carriers
Question 10. The doping level in a zener diode is ___________ that of a crystal diode
  1.    the same as
  2.    less than
  3.    more than
  4.    none of the above
Explanation:-
Answer: Option C. -> more than
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