Analog Electronics(Electrical Engineering ) Questions and Answers

Question 1. In a CB amplifier the maximum efficiency could be
  1.    99%
  2.    85%
  3.    50%
  4.    25%
Explanation:-
Answer: Option D. -> 25%
Question 2. The action of JFET in its equivalent circuit can best be represented as a
  1.    Current controlled Current source
  2.    Current controlled voltage source
  3.    Voltage controlled voltage source
  4.    voltage controlled current source
Explanation:-
Answer: Option D. -> voltage controlled current source
Question 3. 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
Explanation:-
Answer: Option C. -> The p+n junction
Question 4. To prevent a DC return between source and load, it is necessary to use
  1.    Resistor between source and load
  2.    Inductor between source and load
  3.    Capacitor between source and load
  4.    Either A or B
Explanation:-
Answer: Option C. -> Capacitor between source and load
Question 5. A constant current signal across a parallel RLC circuits gives an output of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ. At the frequency of 4KHZ, the output voltage will be
  1.    1 v
  2.    2 v
  3.    1.4 v
  4.    2.8 v
Explanation:-
Answer: Option B. -> 2 v
Question 6. A change in the value of the emitter resistance Re in a differential amplifier
  1.    Affects the difference mode gain Ad
  2.    Affects the common mode gain Ac
  3.    Affects both Ad and Ac
  4.    Does not effect either Ad and Ac
Explanation:-
Answer: Option B. -> Affects the common mode gain Ac
Question 7. 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
Explanation:-
Answer: Option D. -> High CMRR
Question 8. Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in
  1.    Only the temperature
  2.    only the β of the transistor
  3.    Both Temperature & β
  4.    None of the above
Explanation:-
Answer: Option C. -> Both Temperature & β
Question 9. The MOSFET switch in its onstate may be considered equivalent to
  1.    Resistor
  2.    Inductor
  3.    Capacitor
  4.    Battery
Explanation:-
Answer: Option C. -> Capacitor
Question 10. The bandwidth of an RF tuned amplifier is dependent on
  1.    Q-factor of the tuned output circuit
  2.    Q-factor of the tuned input circuit
  3.    Quiescent operating point
  4.    Q-factor of the output and input circuits as well as quiescent operating point
Explanation:-
Answer: Option A. -> Q-factor of the tuned output circuit
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