Multistage Transistor Amplifiers MCQ

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• In practice, voltage gain is expressed ___________
  ক

  In db

  খ

  In volts

  গ

  As a number

  ঘ

  None of the above
• In transistor amplifiers, we use ___________ transformer for impedance matching
  ক

  Step up

  খ

  Step down

  গ

  Same turn ratio

  ঘ

  None of the above
• The frequency response of transformer coupling is ___________
  ক

  Good

  খ

  Very good

  গ

  Excellent

  ঘ

  Poor
• The purpose of RC or transformer coupling is to ___________
  ক

  Block a.c.

  খ

  Separate bias of one stage from another

  গ

  Increase thermal stability

  ঘ

  None of the above
• Transformer coupling is generally employed when load resistance is
  ক

  Large

  খ

  Very large

  গ

  Small

  ঘ

  None of the above
• The bandwidth of a single stage amplifier is ___________ that of a multistage amplifier
  ক

  More than

  খ

  The same as

  গ

  Less than

  ঘ

  Data insufficient
• ___________ coupling provides the maximum voltage gain
  ক

  RC

  খ

  Transformer

  গ

  Direct

  ঘ

  Impedance
• RC coupling is generally confined to low power applications because of
  ক

  Large value of coupling capacitor

  খ

  Low efficiency

  গ

  Large number of components

  ঘ

  None of the above
• The ear is not sensitive to ___________
  ক

  Frequency distortion

  খ

  Amplitude distortion

  গ

  Frequency as well as amplitude distortion

  ঘ

  None of the above
• In RC coupling, the value of coupling capacitor is about ___________
  ক

  100 pF

  খ

  0.1 µF

  গ

  0.01 µF

  ঘ

  10 µF
• In obtaining the frequency response curve of an amplifier, the ___________
  ক

  Amplifier level output is kept constant

  খ

  Amplifier frequency is held constant

  গ

  Generator frequency is held constant

  ঘ

  Generator output level is held constant
• The final stage of a multistage amplifier uses ___________
  ক

  RC coupling

  খ

  Transformer coupling

  গ

  Direct coupling

  ঘ

  Impedance coupling
• When a multistage amplifier is to amplify d.c. signal, then one must use coupling
  ক

  RC

  খ

  Transformer

  গ

  Direct

  ঘ

  None of the above
• An advantage of RC coupling scheme is the ___________
  ক

  Good impedance matching

  খ

  Economy

  গ

  High efficiency

  ঘ

  None of the above
• In an RC coupling scheme, the coupling capacitor CC must be large enough ___________
  ক

  To pass d.c. between the stages

  খ

  Not to attenuate the low frequencies

  গ

  To dissipate high power

  ঘ

  None of the above
• In an RC coupled amplifier, the voltage gain over mid-frequency range ___________
  ক

  Changes abruptly with frequency

  খ

  Is constant

  গ

  Changes uniformly with frequency

  ঘ

  None of the above
• The best frequency response is of ___________ coupling
  ক

  RC

  খ

  Transformer

  গ

  Direct

  ঘ

  None of the above
• The upper or lower cut off frequency is also called ___________ frequency
  ক

  Resonant

  খ

  Sideband

  গ

  3 db

  ঘ

  None of the above
• The lower and upper cut off frequencies are also called ___________ frequencies
  ক

  Sideband

  খ

  Resonant

  গ

  Half-resonant

  ঘ

  Half-power
• Transformer coupling is used for ___________ amplification
  ক

  Power

  খ

  Voltage

  গ

  Current

  ঘ

  None of the above
• RC coupling is used for ___________ amplification
  ক

  Voltage

  খ

  Current

  গ

  Power

  ঘ

  None of the above
• A radio receiver has ___________ of amplification
  ক

  One stage

  খ

  Two stages

  গ

  Three stages

  ঘ

  More than one stages
• In the initial stages of a multistage amplifier, we use ___________
  ক

  RC coupling

  খ

  Transformer coupling

  গ

  Direct coupling

  ঘ

  None of the above
• The number of stages that can be directly coupled is limited because
  ক

  Changes in temperature cause thermal instability

  খ

  Circuit becomes heavy and costly

  গ

  It becomes difficult to bias the circuit

  ঘ

  None of the above
• If the power level of an amplifier reduces to half, the db gain will fall by .
  ক

  5 db

  খ

  2 db

  গ

  10 db

  ঘ

  3 db
• RC coupling is not used to amplify extremely low frequencies because
  ক

  There is considerable power loss

  খ

  There is hum in the output

  গ

  Electrical size of coupling capacitor becomes very large

  ঘ

  None of the above
• The gain of an amplifier is expressed in db because ___________
  ক

  It is a simple unit

  খ

  Calculations become easy

  গ

  Human ear response is logarithmic

  ঘ

  None of the above