FET(Field Effect Transistors) MCQ

Test your knowledge with important FET(Field Effect Transistors) MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more FET(Field Effect Transistors) MCQs at Bissoy

• The channel of a JFET is between the ___________
  ক

  gate and drain

  খ

  drain and source

  গ

  gate and source

  ঘ

  input and output
• A JFET is similar in operation to ___________ valve
  ক

  diode

  খ

  pentode

  গ

  triode

  ঘ

  tetrode
• In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers
  ক

  almost touch each other

  খ

  have large gap

  গ

  have moderate gap

  ঘ

  none of the above
• A MOSFET can be operated with ___________
  ক

  negative gate voltage only

  খ

  positive gate voltage only

  গ

  positive as well as negative gate voltage

  ঘ

  none of the above
• In class A operation, the input circuit of a JFET is ___________ biased
  ক

  forward

  খ

  reverse

  গ

  not

  ঘ

  none of the above
• The gate of a JFET is ___________ biased
  ক

  reverse

  খ

  forward

  গ

  reverse as well as forward

  ঘ

  none of the above
• 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 ___________
  ক

  20 mA

  খ

  0 mA

  গ

  40 mA

  ঘ

  10 mA
• A certain common source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ___________
  ক

  the voltage gain will increase

  খ

  the transconductance will increase

  গ

  the voltage gain will decrease

  ঘ

  the Q-point will shift
• The input impedance of a MOSFET is of the order of ___________
  ক

  O

  খ

  a few hundred O

  গ

  kΩ

  ঘ

  several MO
• In a FET, there are ___________ pn junctions at the sides
  ক

  three

  খ

  four

  গ

  five

  ঘ

  two
• A CS JFET amplifier has a load resistance of 10 kΩ , R_D = 820 V. If g_m = 5 mS and V_in = 500 mV, the output signal voltage is
  ক

  2.05 V

  খ

  25 V

  গ

  0.5 V

  ঘ

  1.89 V
• In a common source JFET amplifier, the output voltage is ___________.
  ক

  180° out of phase with input

  খ

  In phase with input

  গ

  90° out of phase with input

  ঘ

  None of the above
• A MOSFET is sometimes called ___________ JFET
  ক

  many gate

  খ

  open gate

  গ

  insulated gate

  ঘ

  shorted gate
• In a JFET, IDSS is known as ___________
  ক

  drain to source current

  খ

  drain to source current with gate shorted

  গ

  drain to source current with gate open

  ঘ

  none of the above
• The two important advantages of a JFET are ___________
  ক

  high input impedance and square-law property

  খ

  inexpensive and high output impedance

  গ

  low input impedance and high output impedance

  ঘ

  none of the above
• The pinch-off voltage of a JFET is about ___________
  ক

  5 V

  খ

  0.6 V

  গ

  15 V

  ঘ

  25 V
• In a p-channel JFET, the charge carriers are ___________
  ক

  electrons

  খ

  holes

  গ

  both electrons and holes

  ঘ

  none of the above
• The transconductance of a JFET ranges from ___________
  ক

  100 to 500 mA/V

  খ

  500 to 1000 mA/V

  গ

  0.5 to 30 mA/V

  ঘ

  above 1000 mA/V
• Which of the following devices has the highest input impedance?
  ক

  JFET

  খ

  MOSFET

  গ

  Crystal diode

  ঘ

  ordinary transistor
• ___________ has the lowest noise-level
  ক

  triode

  খ

  ordinary trnsistor

  গ

  tetrode

  ঘ

  JFET
• A n-channel D-MOSFET with a positive VGS is operating in ___________
  ক

  the depletion-mode

  খ

  the enhancement-mode

  গ

  cut off

  ঘ

  saturation
• When drain voltage equals the pinch-off-voltage, then drain current ___________ with the increase in drain voltage
  ক

  decreases

  খ

  increases

  গ

  remains constant

  ঘ

  none of the above
• For VGS = 0 V, the drain current becomes constant when VDS exceeds
  ক

  cut off

  খ

  VDD

  গ

  VP

  ঘ

  o V
• The pinch-off voltage in a JFET is analogous to ___________ voltage in a vacuum tube
  ক

  anode

  খ

  cathode

  গ

  grid cut off

  ঘ

  none of the above
• A MOSFET has ___________ terminals
  ক

  two

  খ

  five

  গ

  four

  ঘ

  three
• A common base configuration of a pnp transistor is analogous to ___________ of a JFET
  ক

  common source configuration

  খ

  common drain configuration

  গ

  common gate configuration

  ঘ

  none of the above
• A JFET is also called ___________ transistor
  ক

  unipolar

  খ

  bipolar

  গ

  unijunction

  ঘ

  none of the above
• A JFET has ___________ power gain
  ক

  small

  খ

  very high

  গ

  very small

  ঘ

  none of the above
• A JFET is a ___________ driven device
  ক

  current

  খ

  voltage

  গ

  both current and voltage

  ঘ

  none of the above
• The source terminal of a JEFT corresponds to ___________ of a vacuum tube
  ক

  plate

  খ

  cathode

  গ

  grid

  ঘ

  none of the above