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MCQs

Analog Electronics

Total Questions : 482 | Page 8 of 49 pages
Question 71. Voltage Series (feedback also called series-shunt feedback) results in
  1.    Increase in both input & output impedances
  2.    Decreases in both input & output impedances
  3.    Increase in input impedance & decreases in output impedance
  4.    Decrease in input impedance & increase in output impedance
 Discuss Question
Answer: Option C. -> Increase in input impedance & decreases in output impedance
Question 72. 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
 Discuss Question
Answer: Option B. -> Affects the common mode gain Ac
Question 73. 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
 Discuss Question
Answer: Option A. -> Q –factor of the tuned o/p circuit
Question 74. 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
 Discuss Question
Answer: Option C. -> Both Temperature & β
Question 75. The MOSFET switch in its onstate may be considered equivalent to
  1.    Resistor
  2.    Inductor
  3.    Capacitor
  4.    Battery
 Discuss Question
Answer: Option C. -> Capacitor
Question 76. 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
 Discuss Question
Answer: Option D. -> High CMRR
Question 77. The horizontal intercept of dc load line is the same as ideal
  1.    Cut off point
  2.    Saturation point
  3.    Operating point
  4.    Quasi saturation point
 Discuss Question
Answer: Option A. -> Cut off point
Question 78. A 741-type OP-amp has a gain-bandwidth product of 1MHz.A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of
  1.    50 KHz
  2.    100 KHz
  3.    1000/17 KHz
  4.    1000/7.07 KHz
 Discuss Question
Answer: Option B. -> 100 KHz
Question 79. A differential amplifier is invariably used in the i/p stage of all OP-amps.This is dome basically to provide the OP-amps with a very high
  1.    CMRR
  2.    Bandwidth
  3.    Slew rate
  4.    Open-loop gain
 Discuss Question
Answer: Option A. -> CMRR
Question 80. The early effect in a bipolar junction transistor is caused by
  1.    Fast turn-on
  2.    Fast turn-off
  3.    Large collector-base reverse bias
  4.    Large emitter-base forward bias
 Discuss Question
Answer: Option C. -> Large collector-base reverse bias

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