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Multistage Transistor Amplifier Quiz | Multistage Transistor Amplifier Objective Type Questions and Answers

Questions
21 The value of emitter capacitor CE in a multistage amplifier is about ……..
A 1 µF
B 100 pF
C 0.01 µF
D 50 µF

Answer: 50 µF
22 The bandwidth of a single stage amplifier is …………. that of a multistage amplifier
A More than
B The same as
C Less than
D Data insufficient

Answer: More than
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23 The upper or lower cut off frequency is also called ………….. frequency
A Resonant
B Sideband
C 3 db
D None of these

Answer: 3 db
24 The purpose of RC or transformer coupling is to …………
A Block a.c.
B Separate bias of one stage from another
C Increase thermal stability
D None of the above

Answer: Separate bias of one stage from another
25 The number of stages that can be directly coupled is limited because ……..
A Changes in temperature cause thermal instability
B Circuit becomes heavy and costly
C It becomes difficult to bias the circuit
D None of the above

Answer: Changes in temperature cause thermal instability
26 RC coupling is generally confined to low power applications because of ………
A Large value of coupling capacitor
B Low efficiency
C Large number of components)
D None of the above

Answer: Low efficiency
27 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?
A 5 mV
B 2 mV
C 8 mV
D 5 mV

Answer: 5 mV
28 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 ?
A 2 W
B 6 W
C 68 W
D None of the above

Answer: 68 W
29 An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?
A 8 db
B 6 db
C 5 db
D 4 db

Answer: 8 db
30 A current amplification of 2000 is a gain of …………….
A 3 db
B 66 db
C 20 db
D 200 db

Answer: 66 db
31 If the power level of an amplifier reduces to half, the db gain will fall by …….
A 5 db
B 2 db
C 10 db
D 3 db

Answer: 3 db
32 The gain of an amplifier is expressed in db because ………..
A It is a simple unit
B Calculations become easy
C Human ear response is logarithmic
D None of the above

Answer: Human ear response is logarithmic
33 The total gain of a multistage amplifier is less than the product of the gains of individual stages due to …………
A Power loss in the coupling device
B Loading effect of the next stage
C The use of many transistors
D The use of many capacitors

Answer: Loading effect of the next stage
34 In the initial stages of a multistage amplifier, we use ………..
A RC coupling
B Transformer coupling
C Direct coupling
D None of the above

Answer: RC coupling
35 The frequency response of transformer coupling is ………….
A Good
B Very good
C Excellent
D Poor

Answer: Poor
36 1 db corresponds to …………. change in voltage or current level
A 40%
B 80%
C 20%
D 25%

Answer: 40%
37 1 db corresponds to ………….. change in power level
A 50%
B 35%
C 26%
D 22%

Answer: 26%
38 A gain of 1000 times in voltage is expressed by …………..
A 60 db
B 30 db
C 120 db
D 600 db

Answer: 60 db
39 A gain of 1,000,000 times in power is expressed by …………….
A 30 db
B 60 db
C 120 db
D 600 db

Answer: 60 db
40 The lower and upper cut off frequencies are also called ………………… frequencies
A Sideband
B Resonant
C Half-resonant
D Half-power

Answer: Half-power

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