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MCQs

Total Questions : 81 | Page 8 of 9 pages
Question 71. . How will a D-MOSFET input impedance change with signal frequency?
  1.    As frequency increases input impedance increases.
  2.    As frequency increases input impedance is constant.
  3.    As frequency decreases input impedance increases.
  4.    As frequency decreases input impedance is constant.
 Discuss Question
Answer: Option C. -> As frequency decreases input impedance increases.
Question 72. . The transconductance curve of a JFET is a graph of:
  1.    IS versus VDS
  2.    IC versus VCE
  3.    ID versus VGS
  4.    ID × RDS
 Discuss Question
Answer: Option C. -> ID versus VGS
Question 73. . What is the transconductance of an FET when ID = 1 mA and VGS = 1 V?
  1.    1 kS
  2.    1 mS
  3.    1 k
  4.    1 m
 Discuss Question
Answer: Option B. -> 1 mS
Question 74. . In an n-channel JFET, what will happen at the pinch-off voltage?
  1.    the value of VDS at which further increases in VDS will cause no further increase in ID
  2.    the value of VGS at which further decreases in VGS will cause no further increases in ID
  3.    the value of VDG at which further decreases in VDG will cause no further increases in ID
  4.    the value of VDS at which further increases in VGS will cause no further increases in ID
 Discuss Question
Answer: Option A. -> the value of VDS at which further increases in VDS will cause no further increase in ID
Question 75. . Which component is considered to be an "OFF" device?
  1.    transistor
  2.    JFET
  3.    D-MOSFET
  4.    E-MOSFET
 Discuss Question
Answer: Option D. -> E-MOSFET
Question 76. . To get a negative gate-source voltage in a self-biased JFET circuit, you must use a ________.
  1.    negative gate supply voltage
  2.    ground
  3.    voltage divider
  4.    source resistor
 Discuss Question
Answer: Option D. -> source resistor
Question 77. . A __________ change in VDS will produce a __________ change in ID.
  1.    small, large
  2.    large, small
  3.    large, large
  4.    small, small
 Discuss Question
Answer: Option B. -> large, small
Question 78. . One advantage of voltage-divider bias is that the dependency of drain current, ID, on the range of Q points is _________.
  1.    reduced
  2.    increased
  3.    not affected
  4.    none of the above
 Discuss Question
Answer: Option A. -> reduced
Question 79. . Changing ________ can control the voltage gain of a common-source amplifier.
  1.    the input voltage
  2.    smdelta.gifm
  3.    VDD
  4.    RS
 Discuss Question
Answer: Option B. -> smdelta.gifm
Question 80. . A _______________ JFET amplifier provides a voltage gain of less than one.
  1.    common-source
  2.    common-gate
  3.    common-drain
  4.    cascode amplifier
 Discuss Question
Answer: Option C. -> common-drain

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