Amplifiers MCQ

Test your knowledge with important Amplifiers MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Amplifiers MCQs at Bissoy

• What is usually required by FETs to optimize the figure of merit?
  ক

  Attenuation of barrier

  খ

  Matching with the depletion region

  গ

  Dispersion of the gate region

  ঘ

  Matching with the detector
• A silicon p-i-n photodiode utilized with the amplifier and the receiver is designed to accept data at a rate of ___________
  ক

  276Mbits-1

  খ

  274 Mbits-1

  গ

  278Mbits-1

  ঘ

  302Mbits-1
• Which receiver can be fabricated using PIN-FET hybrid approach?
  ক

  Trans-impedance front end receiver

  খ

  Gallium arsenide receiver

  গ

  High-impedance front-end

  ঘ

  Low-impedance front-end
• It is difficult to achieve higher transmission rates using conventional __________
  ক

  Voltage amplifier

  খ

  Waveguide Structures

  গ

  PIN-FET or APD receivers

  ঘ

  MESFET
• PIN-FET hybrid receiver is designed for use at a transmission rate of _____________
  ক

  130 Mbits-1

  খ

  110 Mbits-1

  গ

  120 Mbits-1

  ঘ

  140 Mbits-1
• The PIN-FET hybrid receivers are a combination of ______________
  ক

  Hybrid resistances and capacitances

  খ

  Pin photodiode and low noise amplifier (GaAs MESFETs)

  গ

  P-N photodiode and low noise amplifier (GaAs MESFETs)

  ঘ

  Attenuator and low noise amplifier (GaAs MESFETs)
• Gallium arsenide MESFETs are advantageous than Silicon FETs.
  ক

  True

  খ

  False
• High-performance microwave FETs are fabricated from ___________
  ক

  Silicon

  খ

  Germanium

  গ

  Gallium arsenide

  ঘ

  Zinc
• Bipolar transistor is more useful amplifying device than FET at frequencies _____________
  ক

  Above 1000 MHz

  খ

  Equal to 1 MHz

  গ

  Below 25 MHz

  ঘ

  Above 25 MHz
• The properties of a bipolar transistor are superior to the FET.
  ক

  True

  খ

  False
• FET device has extremely high input impedance greater than _________
  ক

  107 Ohms and less than 108

  খ

  106 Ohms and less than 107

  গ

  1014 Ohms

  ঘ

  1023 Ohms
• ____________ is the lowest noise amplifier device.
  ক

  Silicon FET

  খ

  Amplifier-A

  গ

  Attenuator

  ঘ

  Resonator-B
• The units of voltage gain is
  ক

  It has no units, it is a ratio

  খ

  Decibels (d[

  গ

  All of the mentioned

  ঘ

  None of the mentioned
• An amplifier has a voltage gain of 100 V/V and a current gain of 1000A/A. the value of the power gain decibel is
  ক

  30 db

  খ

  40 db

  গ

  50 db

  ঘ

  60 db
• If Av, Ai and Ap represents the voltage gain, current gain and power gain ratio of an amplifier which of the below is not the correct expression for the corresponding values in decibel?
  ক

  Current gain: 20 log Ai db

  খ

  Voltage gain: 20 log Av db

  গ

  Power gain: 20 log Ap db

  ঘ

  Power gain: 10 log Ap
• What is meant by stability of the an amplified signal?
  ক

  The amplified signal must have a finite amplitude

  খ

  The amplified signal should not have self oscillation

  গ

  The input and the output signal must be proportional

  ঘ

  The ratio of the input and the output signal must be finite
• Symmetrically saturated amplifiers operating in clipping mode can be used to convert a sine wave to a
  ক

  Square wave

  খ

  Pseudo Square wave

  গ

  Sawtooth wave

  ঘ

  Triangular wave
• Which of the following isn’t true?
  ক

  Both transformer and amplifier can provide voltage gain

  খ

  Both transformer and amplifier can provide current gain

  গ

  Both transformer and amplifier can provide power gain

  ঘ

  None of the mentioned
• Statement 1: Voltage gain of -5 means that the output voltage has been attenuated. Statement 2: Voltage gain of -5db means that the output voltage has been attenuated.
  ক

  Statement 1 and Statement 2 are true

  খ

  Statement 1 and Statement 2 are false

  গ

  Only Statement 1 is true

  ঘ

  Only Statement 2 is true
• The voltage gain of the amplifier is 8 and the current gain is 7. The power gain of the amplifier is
  ক

  56 db

  খ

  17.481 db

  গ

  34.963 db

  ঘ

  1 db
• In order to prevent distortion in the output signal after amplification, the input signal must be
  ক

  Higher than the positive saturation level of the amplifier

  খ

  Lower than the negative saturation level of the amplifier

  গ

  Must lie with the negative and the positive saturation level of the amplifier

  ঘ

  Both higher than the positive saturation level of the amplifier and lower than the negative saturation level of the amplifier
• An amplifier operating from ±3V provide a 2.2V peak sine wave across a 100 ohm load when provided with a 0.2V peak sine wave as an input from which 1.0mA current is drawn. The average current in each supply is measured to be 20mA. What is the amplifier efficiency?
  ক

  20.2%

  খ

  25.2%

  গ

  30.2%

  ঘ

  35.2%