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MCQs

Total Questions : 848 | Page 2 of 85 pages
Question 11. The conduction band is
  1.    same as forbidden energy gap
  2.    generally located on the top of the crystal
  3.    generally located on the bottom of the crystal
  4.    a range of energies corresponding to the energies of the free electrons
 Discuss Question
Answer: Option D. -> a range of energies corresponding to the energies of the free electrons
Answer: (d).a range of energies corresponding to the energies of the free electrons
Question 12. Higher value of ripple factor indicates
  1.    poor rectification
  2.    ideal rectification
  3.    r.m.s. value to peak value
  4.    none of the above
 Discuss Question
Answer: Option A. -> poor rectification
Answer: (a).poor rectification
Question 13. When a semi-conductor is doped, its electrical conductivity
  1.    increases
  2.    decreases in the direct ratio of the doped material
  3.    decreases in the inverse ratio of the doped material
  4.    remains unaltered
 Discuss Question
Answer: Option A. -> increases
Answer: (a).increases
Question 14. In a triode
  1.    grid is nearer to cathode than anode
  2.    grid is nearer to anode than cathode
  3.    grid is equidistant from anode and cathode
  4.    any of the above
 Discuss Question
Answer: Option A. -> grid is nearer to cathode than anode
Answer: (a).grid is nearer to cathode than anode
Question 15. In an n channel JFET, VGS = VGS(off). Then
  1.    ID is zero
  2.    ID may be zero or positive
  3.    ID is positive
  4.    ID may be zero or negative
 Discuss Question
Answer: Option A. -> ID is zero
Answer: (a).ID is zero
Question 16. Varactor diode is forward biased when it is used.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 17. If an additional two diodes were used to connect the 1 kW load across a bridge rectifier circuits, utilizing the full secondary of the transformer, how much d.c. power could be delivered using a transformer with the rating of 105 VA?
  1.    35 W
  2.    60 W
  3.    85 W
  4.    100 W
 Discuss Question
Answer: Option C. -> 85 W
Answer: (c).85 W
Question 18. A good ohmic contact on a P-type semiconductor chip is formed by introducing
  1.    gold as an impurity below the contact
  2.    high concentration of donors below the contact
  3.    high concentration of acceptors below the contact
  4.    thin insulator layer between the metal and semiconductor
 Discuss Question
Answer: Option B. -> high concentration of donors below the contact
Answer: (b).high concentration of donors below the contact
Question 19. The impurity added to extrinsic semiconductor is of the order of
  1.    1 in 100
  2.    1 in 1000
  3.    1 in 100, 0000
  4.    1 in 100, 000, 000
 Discuss Question
Answer: Option B. -> 1 in 1000
Answer: (b).1 in 1000
Question 20. Which one of the following circuits is most suitable as an oscillator at a frequency of 100Hz?
  1.    Hartley oscillator
  2.    Colpitts oscillator
  3.    Crystal oscillator
  4.    Twin-T oscillator
 Discuss Question
Answer: Option A. -> Hartley oscillator
Answer: (a).Hartley oscillator

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