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MCQs

Total Questions : 81 | Page 4 of 9 pages
Question 31. The two important advantages of a JFET are ___________
  1.    high input impedance and square-law property
  2.    inexpensive and high output impedance
  3.    low input impedance and high output impedance
  4.    none of the above
 Discuss Question
Answer: Option A. -> high input impedance and square-law property
Question 32. In a JFET, IDSS is known as ___________
  1.    drain to source current
  2.    drain to source current with gate shorted
  3.    drain to source current with gate open
  4.    none of the above
 Discuss Question
Answer: Option B. -> drain to source current with gate shorted
Question 33. A MOSFET is sometimes called ___________ JFET
  1.    many gate
  2.    open gate
  3.    insulated gate
  4.    shorted gate
 Discuss Question
Answer: Option C. -> insulated gate
Question 34. A CS JFET amplifier has a load resistance of 10 kΩ , RD= 820° . If gm= 5mS and Vin= 500 mV, the output signal voltage is ___________
  1.    2.05 V
  2.    25 V
  3.    0.5 V
  4.    1.89 V
 Discuss Question
Answer: Option D. -> 1.89 V
Question 35. In a FET, there are ___________ pn junctions at the sides
  1.    three
  2.    four
  3.    five
  4.    two
 Discuss Question
Answer: Option D. -> two
Question 36. The input impedance of a MOSFET is of the order of ___________
  1.    O
  2.    a few hundred O
  3.    kΩ
  4.    several MO
 Discuss Question
Answer: Option D. -> several MO
Question 37. A certain common source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ___________
  1.    the voltage gain will increase
  2.    the transconductance will increase
  3.    the voltage gain will decrease
  4.    the Q-point will shift
 Discuss Question
Answer: Option C. -> the voltage gain will decrease
Question 38. A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is ___________
  1.    20 mA
  2.    0 mA
  3.    40 mA
  4.    10 mA
 Discuss Question
Answer: Option A. -> 20 mA
Question 39. The gate of a JFET is ___________ biased
  1.    reverse
  2.    forward
  3.    reverse as well as forward
  4.    none of the above
 Discuss Question
Answer: Option A. -> reverse
Question 40. In class A operation, the input circuit of a JFET is ___________ biased
  1.    forward
  2.    reverse
  3.    not
  4.    none of the above
 Discuss Question
Answer: Option B. -> reverse

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