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MCQs

Total Questions : 177 | Page 6 of 18 pages
Question 51. Commonly used photoemissive material is _______
  1.    gold
  2.    opium
  3.    tellurium
  4.    cesium-antimony
 Discuss Question
Answer: Option D. -> cesium-antimony
Answer: (d).cesium-antimony
Question 52. Photoconductors are made of _______
  1.    thick layer of semiconductor
  2.    thin layer of semiconductor
  3.    capacitive substrate
  4.    inductive substrate
 Discuss Question
Answer: Option B. -> thin layer of semiconductor
Answer: (b).thin layer of semiconductor
Question 53. Phototubes are very quick in response to light.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 54. Optocoupler consists of a phototransistor and a led.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 55. When an open circuited pn junction is illuminated then _________________
  1.    resistance increases
  2.    there is no effect
  3.    electron hole pairs are formed
  4.    capacitance increases
 Discuss Question
Answer: Option C. -> electron hole pairs are formed
Answer: (c).electron hole pairs are formed
Question 56. Response time for gas-filled phototubes is _______
  1.    zero
  2.    intermediate
  3.    fast
  4.    slow
 Discuss Question
Answer: Option D. -> slow
Answer: (d).slow
Question 57. Reverse leakage current in a transistor _______
  1.    is affected by light
  2.    is not affected by light
  3.    increases with a decrease in pressure
  4.    decreases with increase in temperature
 Discuss Question
Answer: Option A. -> is affected by light
Answer: (a).is affected by light
Question 58. Electrical transducers are ________
  1.    small and non-portable
  2.    large and non-portable
  3.    small and compact
  4.    large and portable
 Discuss Question
Answer: Option C. -> small and compact
Answer: (c).small and compact
Question 59. Electrical transducers are costly.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 60. Active transducers are classified into ____________
  1.    4 types
  2.    2 types
  3.    6 types
  4.    8 types
 Discuss Question
Answer: Option A. -> 4 types
Answer: (a).4 types

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