Electronic Circuit Analysis Mid - I, February - 2012

1.Which of the following amplifier has high power gain
  • CB
  • CE
  • CC
  • both CB and CE
Answer: B
2.The slope of ac load line is _________ that of dc load line.
  • same as
  • more than
  • less than
  • None of the above
Answer: B
3.In the initial stages of a multi stage amplifier, we use
  • RC coupling
  • transformer coupling
  • direct coupling
  • None
Answer: A
4.The bandwidth of a single stage amplifier is ___ that of a multi stage amplifier.
  • more than
  • less than
  • same as
  • none
Answer: A
5.In a RC coupled amplifier, which of the following component is mainly responsible for harmonic distortion of the signal
  • Transistor
  • Biasing resistor
  • coupling capacitor
  • power supply
Answer: A
6.The darlington pair consists of the following two stages
  • CE,CC
  • CE,CB
  • both CE
  • both CC
Answer: D
7.The gain bandwidth product of a two stage amplifier is
  • same as that of single stage
  • greater than that of single stage
  • less than that of single stage
  • product of two gain bandwidth products of each stage
Answer: B
8.In a CE amplifier, the unbypassed emitter resistance provides
  • Voltage shunt feedback
  • Current series feedback
  • Negative voltage feedback
  • Positive current feedback
Answer: C
9.How does the amplifier behave for high frequencies?
  • high pass filter
  • low pass filter
  • band pass filter
  • None
Answer: B
10.A source follower using FET usually has a voltage gain of _____.
  • -1
  • >100
  • about -10
  • less than 1 but positive
Answer: B
11.Transformer coupling is generally used when RL is ________________.
Answer: Small
12.The phase difference between output and input voltages of a CB amplifier is
Answer: 0
13.In a two stage cascaded amplifier, each of two cascaded stages has a voltage gain of 30 then the overall gain is _______________.
Answer: 900
14.The input impedance Ri of a CE amplifier in terms of hie, hoe, hre and load resistance. ___________________.
Answer: 60db
15.__________ is called as source follower.
Answer: CD amplifier
16.Cascode amplifier is combination of ___________________.
Answer: CB-CE
17.According to Miller’s theorem, the feedback capacitance when referred to input side with gain A is _______________________.
Answer: Cin = C(1-A)
18.CS amplifier produces a phase shift of ________________0.
Answer: 180
19.Trans conductance gm in hybrid - π model is defined as ______________________.
Answer: gm = ΔIc / ΔVBE when VCE=Constant
20.Why do we go for multi stage amplifiers? ___________________
Answer: for high gain