Q.1
The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?
Q.2
A gain of 1,000,000 times in power is expressed by ___________
Q.3
In the initial stages of a multistage amplifier, we use ___________
Q.4
A radio receiver has ___________ of amplification
Q.5
In an RC coupling scheme, the coupling capacitor CC must be large enough ___________
Q.6
In transistor amplifiers, we use ___________ transformer for impedance matching
Q.7
The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?
Q.8
If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is ___________
Q.9
A gain of 1000 times in voltage is expressed by ___________
Q.10
RC coupling is used for ___________ amplification
Q.11
Transformer coupling is used for ___________ amplification
Q.12
The lower and upper cut off frequencies are also called ___________ frequencies
Q.13
In practice, voltage gain is expressed ___________
  • In db
  • In volts
  • As a number
  • None of the above
Q.14
In practice, voltage gain is expressed ___________
  • In db
  • In volts
  • As a number
  • None of the above
Q.15
The total gain of a multistage amplifier is less than the product of the gains of individual stages due to ___________
  • Power loss in the coupling device
  • Loading effect of the next stage
  • The use of many transistors
  • The use of many capacitors
Q.16
In transistor amplifiers, we use ___________ transformer for impedance matching
  • Step up
  • Step down
  • Same turn ratio
  • None of the above
Q.17
The frequency response of transformer coupling is ___________
  • Good
  • Very good
  • Excellent
  • Poor
Q.18
The purpose of RC or transformer coupling is to ___________
  • Block a.c.
  • Separate bias of one stage from another
  • Increase thermal stability
  • None of the above
Q.19
Transformer coupling is generally employed when load resistance is
  • Large
  • Very large
  • Small
  • None of the above
Q.20
The bandwidth of a single stage amplifier is ___________ that of a multistage amplifier
  • More than
  • The same as
  • Less than
  • Data insufficient
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