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MCQs

Analog Electronics

Total Questions : 482 | Page 3 of 49 pages
Question 21. The current gain of a bipolar transistor drops at high frequencies because of
  1.     Transistor capacitances
  2.     High current effects in the base
  3.     Parasitic inductive elements
  4.     The early effect
 Discuss Question
Answer: Option A. ->  Transistor capacitances
Question 22. 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 23. 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 24. 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 25. 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 26. 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 27. 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 28. 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 29. In a transistor leakage current mainly depends on
  1.     Doping of base
  2.     Size of emitter
  3.     Rating of transistor
  4.     Temperature
 Discuss Question
Answer: Option D. ->  Temperature
Question 30. 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
 Discuss Question
Answer: Option C. ->  Overcome a crossover distortion

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