Q.1
The output of a microphone is rated at -db. The reference level isunder specified conditions. What is the output voltage of this microphone under the same sound conditions?
  • 5 mV
  • 2 mV
  • 8 mV
  • 5 mV
Q.2
In RC coupling, the value of coupling capacitor is about ___________
  • 100 pF
  • 0.1 µF
  • 0.01 µF
  • 10 µF
Q.3
The ear is not sensitive to ___________
  • Frequency distortion
  • Amplitude distortion
  • Frequency as well as amplitude distortion
  • None of the above
Q.4
RC coupling is generally confined to low power applications because of
  • Large value of coupling capacitor
  • Low efficiency
  • Large number of components
  • None of the above
Q.5
RC coupling is generally confined to low power applications because of
  • Large value of coupling capacitor
  • Low efficiency
  • Large number of components
  • None of the above
Q.6
___________ coupling provides the maximum voltage gain
  • RC
  • Transformer
  • Direct
  • Impedance
Q.7
If a three-stage amplifier has individual stage gains ofdb, 5 db anddb, then total gain in db is ___________
  • 600 db
  • 24 db
  • 14 db
  • 27 db
Q.8
In obtaining the frequency response curve of an amplifier, the ___________
  • Amplifier level output is kept constant
  • Amplifier frequency is held constant
  • Generator frequency is held constant
  • Generator output level is held constant
Q.9
An amplifier receives 0.1 W of input signal and deliversW of signal power. What is the power gain in db?
  • 8 db
  • 6 db
  • 5 db
  • 4 db
Q.10
1 db corresponds to ___________ change in power level
  • 50%
  • 35%
  • 26%
  • 22%
Q.11
A gain oftimes in voltage is expressed by ___________
  • 60 db
  • 30 db
  • 120 db
  • 600 db
Q.12
A gain of 1,000,times in power is expressed by ___________
  • 30 db
  • 60 db
  • 120 db
  • 600 db
Q.13
The power output of an audio system isW. 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 ?
  • 2 W
  • 6 W
  • 68 W
  • None of the above
Q.14
When a multistage amplifier is to amplify d.c. signal, then one must use coupling
  • RC
  • Transformer
  • Direct
  • None of the above
Q.15
An advantage of RC coupling scheme is the ___________
  • Good impedance matching
  • Economy
  • High efficiency
  • None of the above
Q.16
In an RC coupling scheme, the coupling capacitor CC must be large enough ___________
  • To pass d.c. between the stages
  • Not to attenuate the low frequencies
  • To dissipate high power
  • None of the above
Q.17
1 db corresponds to ___________ change in voltage or current level
  • 40%
  • 80%
  • 20%
  • 25%
Q.18
The best frequency response is of ___________ coupling
  • RC
  • Transformer
  • Direct
  • None of the above
Q.19
The upper or lower cut off frequency is also called ___________ frequency
  • Resonant
  • Sideband
  • 3 db
  • None of the above
Q.20
The lower and upper cut off frequencies are also called ___________ frequencies
  • Sideband
  • Resonant
  • Half-resonant
  • Half-power
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