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MCQs

Total Questions : 44 | Page 1 of 5 pages
Question 1. If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is ___________ biased.
  1.    forward
  2.    reverse
  3.    either forward or reverse
  4.    none of the above
 Discuss Question
Answer: Option A. -> forward
Question 2. In the breakdown region, a zener didoe behaves like a ___________ source.
  1.    constant voltage
  2.    constant current
  3.    constant resistance
  4.    none of the above
 Discuss Question
Answer: Option A. -> constant voltage
Question 3. When the crystal current diode current is large, the bias is ___________
  1.    forward
  2.    inverse
  3.    poor
  4.    reverse
 Discuss Question
Answer: Option A. -> forward
Question 4. If the temperature of a crystal diode increases, then leakage current ___________
  1.    remains the same
  2.    decreases
  3.    increases
  4.    becomes zero
 Discuss Question
Answer: Option C. -> increases
Question 5. The d.c. resistance of a crystal diode is ___________ its a.c. resistance
  1.    the same as
  2.    more than
  3.    less than
  4.    none of the above
 Discuss Question
Answer: Option C. -> less than
Question 6. For the same secondary voltage, the output voltage from a centre-tap rectifier is ___________ than that of bridge rectifier
  1.    twice
  2.    thrice
  3.    four time
  4.    one-half
 Discuss Question
Answer: Option D. -> one-half
Question 7. The disadvantage of a half-wave rectifier is that the___________
  1.    components are expensive
  2.    diodes must have a higher power rating
  3.    output is difficult to filter
  4.    none of the above
 Discuss Question
Answer: Option C. -> output is difficult to filter
Question 8. A crystal diode is used as ___________
  1.    an amplifier
  2.    a rectifier
  3.    an oscillator
  4.    a voltage regulator
 Discuss Question
Answer: Option B. -> a rectifier
Question 9. A zener diode is used as ___________
  1.    an amplifier
  2.    a voltage regulator
  3.    a rectifier
  4.    a multivibrator
 Discuss Question
Answer: Option B. -> a voltage regulator
Question 10. A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop.
  1.    27.5 V
  2.    86.5 V
  3.    30 V
  4.    42.5 V
 Discuss Question
Answer: Option D. -> 42.5 V

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