Exercise: Analog Electronics

Questions for: Analog Electronics

In figure the approximate voltages of
A:
base and emitter are - 8 V and - 7.3 V
B:
base and collector are - 8 V and - 5 V
C:
collector and emitter are - 5 V and - 7.3 V
D:
base, emitter and collector are - 8, - 7.3 and - 5 V
Answer: A

Base voltage = . Emitter voltage = - 8 + 0.7 = - 7.3 V.

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A second order active bandpass filter can be obtained by cascading LP second order filter having higher cut off frequency fOH with a second order HP filter having lower cut off frequency fOL provided
A:
fOL < fOH
B:
fOL > fOH
C:
fOH = fOL
D:
fOH < 0.5 fOL
Answer: A

If fOL is less than fOH, a passband will exist from fOL to fOH .

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The feedback technique employed in the following circuit is
A:
voltage series feedback
B:
current series feedback
C:
voltage shunt feedback
D:
current shunt feedback
Answer: C

It is a voltage shunt feedback because output voltage is sampled and feedback current at the input side. The circuit can be redrawn as follows.

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Which of the following can be used as a buffer amplifier?
A:
CE
B:
CC
C:
CB
D:
Both (a) and (c)
Answer: B

Because of high input impedance and low output impedance, CC amplifier is suitable as buffer amplifier.

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The current through R1 is(If β = 99, VBE = 0.74 V)
A:
0.1 mA
B:
0.35 mA
C:
0.2 mA
D:
none
Answer: A

IE = 1 mA, VBE = 0.7V, β = 99,

IC = aIE, IC = β, IB 1 =

IB = 0.01 mA.

0.1 mA.

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