Analog Electronics

11. Which of the following is not associated with a p-n junction

  1. junction capacitance
  2. charge storage capacitance
  3. depletion capacitance
  4. channel length modulation

Correct answer: (D)
channel length modulation

12. In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at

  1. the edge of the depletion region on the p-side
  2. the edge of the depletion region on the n-side
  3. the p-n junction
  4. the center of the depletion region on the n-side

Correct answer: (C)
the p-n junction

13. An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is

  1. 0.25
  2. 0.5
  3. 0.75
  4. 1

Correct answer: (B)
0.5

14. In a common emitter, unbypassed resister provides

  1. voltage shunt feedback
  2. current series feedback
  3. negative voltage feedback
  4. positive current feedback

Correct answer: (C)
negative voltage feedback

15. A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be

  1. 1 v
  2. 2v
  3. 1.4v
  4. 2.8v

Correct answer: (B)
2v

16. Class AB operation is often used in power large signal) amplifiers in order to

  1. get maximum efficiency
  2. remove even harmonics
  3. overcome a crossover distortion
  4. reducing collector dissipation

Correct answer: (C)
overcome a crossover distortion

17. The bandwidth of an RF tuned amplifier is dependent on

  1. Q –factor of the tuned o/p circuit
  2. Q –factor of the tuned i/p circuit
  3. Quiescent operating point
  4. Q-factor of the o/p and i/p circuits as well as quiescent operating point

Correct answer: (A)
Q –factor of the tuned o/p circuit

18. If =0.98 ,Ico=6μA and Iβ=100μA for a transistor,then the value of Ic will be

  1. 2.3mA
  2. 3.2mA
  3. 4.6 mA
  4. 5.2mA

Correct answer: (D)
5.2mA

19. The MOSFET switch in its on-state may be considered equivalent to

  1. resistor
  2. inductor
  3. capacitor
  4. battery

Correct answer: (C)
capacitor

20. Most of the linear ICs are based on the two-transistor differential amplifier because of its

  1. input voltage dependent linear transfer characteristic
  2. high voltage gain
  3. high input resistance
  4. high CMRR

Correct answer: (D)
high CMRR

Page 2 of 5