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MCQs

Total Questions : 304 | Page 1 of 31 pages
Question 1.  Which of the following device has characteristic close to that of an ideal voltage source?
  1.    Zener diode
  2.    Vacuum diode
  3.    Crystal diode
  4.    All of the above
 Discuss Question
Answer: Option A. -> Zener diode
Question 2.  Which of the following material is used for infra-red LED's?
  1.    Gallium arsenide
  2.    Galcium phosphide
  3.    Silicon
  4.    None of the above
 Discuss Question
Answer: Option A. -> Gallium arsenide
Question 3.  Which of the following device has characteristics closed to that of an ideal current source?
  1.    Gas diode
  2.    Crystal diode
  3.    Transistor is CB mode
  4.    All of the above
 Discuss Question
Answer: Option C. -> Transistor is CB mode
Question 4.  The power consumption of LEDs may be of the order of
  1.    5 to 10 nano amperes
  2.    5 to 10 micro amperes
  3.    5 to 10 milliamperes
  4.    5 to 10 amperes
 Discuss Question
Answer: Option C. -> 5 to 10 milliamperes
Question 5.  Which of the following material finds application in light emitting diodes?
  1.    Silicon
  2.    Phosphorous
  3.    Sulphur
  4.    Gallium phosphide
 Discuss Question
Answer: Option D. -> Gallium phosphide
Question 6.  A Zener diode
  1.    has a high forward-voltage rating
  2.    has a sharp breakdown at low reverse voltage
  3.    is useful as an amplifier
  4.    has a negative resistance
 Discuss Question
Answer: Option B. -> has a sharp breakdown at low reverse voltage
Question 7.  LEDs normally work on a voltage of
  1.    Ito 2 V
  2.    10 to 20 V
  3.    50 to 60 V
  4.    100 to 250 V
 Discuss Question
Answer: Option A. -> Ito 2 V
Question 8.  LED's do not require
  1.    heating
  2.    warm up time
  3.    both (a) and (b) above
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (a) and (b) above
Question 9. . Which of the following is not a four layer diode?
  1.    SCR
  2.    Triac
  3.    Thyrisor
  4.    Diac
 Discuss Question
Answer: Option D. -> Diac
Question 10.  A zener diode
  1.    has a high forward voltage rating
  2.    has a sharp breakdown at low reverse voltage
  3.    can be used as an amplifier
  4.    none of the above
 Discuss Question
Answer: Option B. -> has a sharp breakdown at low reverse voltage

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