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MCQs

Total Questions : 81 | Page 3 of 9 pages
Question 21. The pinch-off voltage in a JFET is analogous to ___________ voltage in a vacuum tube
  1.    anode
  2.    cathode
  3.    grid cut off
  4.    none of the above
 Discuss Question
Answer: Option C. -> grid cut off
Question 22. At cut-off, the JFET channel is ___________
  1.    at its widest point
  2.    completely closed by the depletion region
  3.    extremely narrow
  4.    reverse baised
 Discuss Question
Answer: Option B. -> completely closed by the depletion region
Question 23. For VGS = 0 V, the drain current becomes constant when VDS exceeds
  1.    cut off
  2.    VDD
  3.    VP
  4.    o V
 Discuss Question
Answer: Option C. -> VP
Question 24. A n-channel D-MOSFET with a positive VGS is operating in ___________
  1.    the depletion-mode
  2.    the enhancement-mode
  3.    cut off
  4.    saturation
 Discuss Question
Answer: Option B. -> the enhancement-mode
Question 25. When drain voltage equals the pinch-off-voltage, then drain current ___________ with the increase in drain voltage
  1.    decreases
  2.    increases
  3.    remains constant
  4.    none of the above
 Discuss Question
Answer: Option C. -> remains constant
Question 26. ___________ has the lowest noise-level
  1.    triode
  2.    ordinary trnsistor
  3.    tetrode
  4.    JFET
 Discuss Question
Answer: Option D. -> JFET
Question 27. Which of the following devices has the highest input impedance?
  1.    JFET
  2.    MOSFET
  3.    Crystal diode
  4.    ordinary transistor
 Discuss Question
Answer: Option B. -> MOSFET
Question 28. The transconductance of a JFET ranges from ___________
  1.    100 to 500 mA/V
  2.    500 to 1000 mA/V
  3.    0.5 to 30 mA/V
  4.    above 1000 mA/V
 Discuss Question
Answer: Option C. -> 0.5 to 30 mA/V
Question 29. In a p-channel JFET, the charge carriers are ___________
  1.    electrons
  2.    holes
  3.    both electrons and holes
  4.    none of the above
 Discuss Question
Answer: Option B. -> holes
Question 30. The pinch-off voltage of a JFET is about ___________
  1.    5 V
  2.    0.6 V
  3.    15 V
  4.    25 V
 Discuss Question
Answer: Option A. -> 5 V

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