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MCQs

Analog Electronics

Total Questions : 482 | Page 7 of 49 pages
Question 61. Negative feedback in an amplifier
  1.    Reduces gain
  2.    Increase frequency &phase distortion
  3.    Reduces bandwidth
  4.    Increases noise
 Discuss Question
Answer: Option A. -> Reduces gain
Question 62. An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current shunt negative feedback amplifier using the above amplifier with a feedbacik factor of 0.2 is
  1.    1/11KΩ
  2.    1/5KΩ
  3.    5KΩ
  4.    11KΩ
 Discuss Question
Answer: Option A. -> 1/11KΩ
Question 63. The most commonly used amplifier in sample & hold circuits is
  1.    A unity gain non-inverting amplifier
  2.    A unity gain inverting amplifier
  3.    An inverting amplifier with a gain of 10
  4.    An inverting amplifiers with a gain of 100
 Discuss Question
Answer: Option B. -> A unity gain inverting amplifier
Question 64. 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
 Discuss Question
Answer: Option B. -> 0.5
Question 65. In a common emitter, unbypassed resister provides
  1.    voltage shunt feedback
  2.    current series feedback
  3.    negative voltage feedback
  4.    positive current feedback
 Discuss Question
Answer: Option C. -> negative voltage feedback
Question 66. The current gain of a BJT is
  1.    gm r0
  2.    gm / r0
  3.    gm rπ
  4.    gm /rπ
 Discuss Question
Answer: Option C. -> gm rπ
Question 67. 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 68. Generally, the gain of a transistor amplifier falls at high frequencies due to the
  1.    Internal Capacitance of the device
  2.    Coupling capacitor at the input
  3.    Skin effect
  4.    Coupling capacitor at the output
 Discuss Question
Answer: Option A. -> Internal Capacitance of the device
Question 69. An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed
  1.    795mV
  2.    395mV
  3.    79.5 mV
  4.    39.5mV
 Discuss Question
Answer: Option C. -> 79.5 mV
Question 70. MOSFET can be used as a
  1.    Current controlled capacitor
  2.    Voltage controlled capacitor
  3.    Current controlled inductor
  4.    Voltage controlled inductors
 Discuss Question
Answer: Option B. -> Voltage controlled capacitor

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