The Junction Field-Effect Transistor MCQ

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• What is the maximum value of gain of an amplifier?
  ক

  140dB

  খ

  130dB

  গ

  120db

  ঘ

  100dB
• Which of the following is the equation for stray capacitance frequency?
  ক

  FH = 1/27R

  খ

  FH = 1/R

  গ

  FH = 54/27R

  ঘ

  FH = 11/27R
• At higher frequency, the capacitance of an amplifier circuit is mainly because of which capacitance?
  ক

  Coupling capacitors

  খ

  Stray capacitance

  গ

  Resistors

  ঘ

  Inductors
• Which of the following is the necessary condition to design an amplifier?
  ক

  Vce ≤ 1⁄10 of RC

  খ

  |Vce| ≤ 1⁄10 of RC

  গ

  |Vce| ≤ 1⁄1000 of RC

  ঘ

  |Vce| ≤ 1⁄100 of RC
• FET amplifier does not obey the law of conservation of energy.
  ক

  True

  খ

  False
• Which of the following is the main advantage of Self bias?
  ক

  Eliminates the need of two power supply

  খ

  Maximum stability

  গ

  Minimum stability

  ঘ

  Maximum & Minimum stability
• The action of JFET in its equivalent circuit can be represented as which of the following?
  ক

  Current controlled current source

  খ

  Current controlled voltage source

  গ

  Voltage controlled current source

  ঘ

  Voltage controlled Voltage source
• The pinch off voltage of JFET is 5v. What is its cut off voltage?
  ক

  2.5V

  খ

  3V

  গ

  4V

  ঘ

  5V
• Two identical FETs, each characterized by the parameters g_m and r_d are connected in parallel .The composite FET is then characterized by the parameters_____________
  ক

  gm/2 and 2rd

  খ

  gm/2 and 2rd

  গ

  2gm and rd/2

  ঘ

  2gm and rd/2
• Which of the following can be considered to be an advantage of FET amplifier as compared to BJT amplifier? A – Higher input impedance B – Good bias stability C – Higher gain-bandwidth product D – Lower noise figure Select the correct answer using the codes given below Codes:
  ক

  A, B and C

  খ

  A, B and D

  গ

  B, C and D

  ঘ

  A, C and D
• For a p-channel FET, What is the direction of current flow?
  ক

  Source to drain

  খ

  Drain to source

  গ

  Gate to source

  ঘ

  Gate to drain
• For an n-channel FET, What is the direction of current flow?
  ক

  Source to drain

  খ

  Drain to source

  গ

  Gate to source

  ঘ

  Gate to drain
• To use FET as a voltage controlled resistor, in which region it should operate?
  ক

  Ohmic region

  খ

  cut off

  গ

  Saturation

  ঘ

  cut off and saturation
• What is the value of drain current when Vgs=pinch off voltage?
  ক

  0A

  খ

  1A

  গ

  2A

  ঘ

  Cannot be determined
• The Shockley equation is __________________
  ক

  ID = (1 – Vgs/Vp)2

  খ

  ID = IDSS (1 – Vgs/Vp)2

  গ

  ID = IDSS (1 – Vgs/Vp)1

  ঘ

  ID = IDSS (1 + Vgs/Vp)2
• What is the value of current when the gate to source voltage is less than the pinch off voltage?
  ক

  1A

  খ

  5A

  গ

  100A

  ঘ

  0
• For a FET when will maximum current flows?
  ক

  Vgs = 0V

  খ

  Vgs = 0v and Vds >= |Vp|

  গ

  VDS >= |Vp|

  ঘ

  Vp = 0
• What is the main advantage of FET which makes it more useful in industrial applications?
  ক

  Voltage controlled operation

  খ

  Less cost

  গ

  Small size

  ঘ

  Semiconductor device
• Comparing the size of BJT and FET, choose the correct statement?
  ক

  BJT is larger than the FET

  খ

  BJT is smaller than the FET

  গ

  Both are of same size

  ঘ

  Depends on application
• Which of the following statement is true about FET?
  ক

  It has high output impedance

  খ

  It has high input impedance

  গ

  It has low input impedance

  ঘ

  It does not offer any resistance
• FET is a voltage controlled device.
  ক

  True

  খ

  False