Analog Electronics MCQs with answers Page - 3

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Admin • 802.91K Points
Coach

Q. An amplifier without feedback has a voltage gain of 50, input resistance of 1 KΩ & Output resistance of 2.5KΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is

  • (A) 1/11KΩ
  • (B) 1/5KΩ
  • (C) 5KΩ
  • (D) 11KΩ

A

Admin • 802.91K Points
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Q. Generally, the gain of a transistor amplifier falls at high frequencies due to the

  • (A) Internal Capacitance of the device
  • (B) Coupling capacitor at the input
  • (C) Skin effect
  • (D) Coupling capacitor at the output

A

Admin • 802.91K Points
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Q. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is

  • (A) 23dB
  • (B) 5dB
  • (C) 46dB
  • (D) 50dB

A

Admin • 802.91K Points
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Q. 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

  • (A) 795 mV
  • (B) 395 mV
  • (C) 795 mV
  • (D) 39.5 mV

A

Admin • 802.91K Points
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Q. A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of

  • (A) 50 KHz
  • (B) 100KHz
  • (C) 1000/17 KHz
  • (D) 1000/7.07 KHz

A

Admin • 802.91K Points
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Q. An npn BJT has gm=38mA/v, cμ =10¯14 F, cπ =10¯13F and DC current gain β0=90. For this transistor fT & fβ are

  • (A) fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
  • (B) fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
  • (C) fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
  • (D) fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

A

Admin • 802.91K Points
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Q. The ideal OP-AMP has the following characteristics.

  • (A) Ri=∞ ,A=∞ ,R0=0
  • (B) Ri=0 ,A=∞ ,R0=0
  • (C) Ri=∞ ,A=∞ ,R0=∞
  • (D) Ri=0 ,A=∞ ,R0=∞

A

Admin • 802.91K Points
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Q. The current gain of a bipolar transistor drops at high frequencies because of

  • (A) Transistor capacitances
  • (B) High current effects in the base
  • (C) Parasitic inductive elements
  • (D) The early effect

A

Admin • 802.91K Points
Coach

Q. A dc power supply has no-load voltage of 30v, and a full-load voltage of 25v at full-load current of 1A. Its output resistance & load regulation ,respectively are

  • (A) 5 Ω & 20 %
  • (B) 25 Ω & 20 %
  • (C) 5 Ω & 16.7 %
  • (D) 25 Ω & 16.7 %

A

Admin • 802.91K Points
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Q. Negative feedback in an amplifier

  • (A) Reduces gain
  • (B) Increase frequency & phase distortion
  • (C) Reduces bandwidth
  • (D) Increases noise

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