Small Signal Operations and Model MCQ

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• Which of the following represents the correct mathematical form of the term denoted by the symbol Rp?
  ক

  ß/gm

  খ

  Vt/Ib

  গ

  All of the mentioned

  ঘ

  None of the mentioned
• The SI units of transconductance is
  ক

  Ampere/ volt

  খ

  Volt/ ampere

  গ

  Ohm

  ঘ

  Siemens
• A designer wishes to create a BJT amplifier with a gm of 50 mA/V and a base input resistance of 2000 O or more. What emitter bis current should he choose?
  ক

  1.06 mA

  খ

  1.16 mA

  গ

  1.26 mA

  ঘ

  1.36 mA
• A designer wishes to create a BJT amplifier with a gm of 50 mA/V and a base input resistance of 2000 O or more. What is the minimum ß he can tolerate for the transistor used?
  ক

  100

  খ

  150

  গ

  200

  ঘ

  250
• A transistor operating with nominal gm of 60 mA/V has a ß that ranges from 50 to 200. Also, the bias circuit, being less than ideal, allows a 20% variation in Ic. What is the largest value found of the resistance looking into the base?
  ক

  1050 ohm

  খ

  21000 ohm

  গ

  3150 ohm

  ঘ

  4200 ohm
• A transistor operating with nominal gm of 60 mA/V has a ß that ranges from 50 to 200. Also, the bias circuit, being less than ideal, allows a 20% variation in Ic. What is the smallest value found of the resistance looking into the base?
  ক

  347 ohm

  খ

  694 ohm

  গ

  1041 ohm

  ঘ

  1388 ohm
• A transistor with ß = 120 is biased to operate at a dc collector current of 1.2 mA. Find the value of Re.
  ক

  2.5 ohm

  খ

  20.6 ohm

  গ

  25.2 ohm

  ঘ

  30.4 ohm
• A transistor with ß = 120 is biased to operate at a dc collector current of 1.2 mA. Find the value of R?p.
  ক

  625 ohm

  খ

  1250 ohm

  গ

  2500 ohm

  ঘ

  5000 ohm
• A transistor with ß = 120 is biased to operate at a dc collector current of 1.2 mA. Find the value of gm.
  ক

  12mA/V

  খ

  24 mA/V

  গ

  36 mA/V

  ঘ

  48 mA/V