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Electrical Engineering
Multistage Transistor Amplifiers
Quiz 2
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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 ?
2 W
6 W
68 W
None of the above
Q.2
A gain of 1,000,000 times in power is expressed by ___________
30 db
60 db
120 db
600 db
Q.3
In the initial stages of a multistage amplifier, we use ___________
RC coupling
Transformer coupling
Direct coupling
None of the above
Q.4
A radio receiver has ___________ of amplification
One stage
Two stages
Three stages
More than one stages
Q.5
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.6
In transistor amplifiers, we use ___________ transformer for impedance matching
Step up
Step down
Same turn ratio
None of the above
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?
5 mV
2 mV
8 mV
5 mV
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 ___________
600 db
24 db
14 db
27 db
Q.9
A gain of 1000 times in voltage is expressed by ___________
60 db
30 db
120 db
600 db
Q.10
RC coupling is used for ___________ amplification
Voltage
Current
Power
None of the above
Q.11
Transformer coupling is used for ___________ amplification
Power
Voltage
Current
None of the above
Q.12
The lower and upper cut off frequencies are also called ___________ frequencies
Sideband
Resonant
Half-resonant
Half-power
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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