Exercise: Analog Electronics

Questions for: Analog Electronics

In the op-amp circuit of figure, V0 =
A:
Vi
B:
3 Vi
C:
5 Vi
D:
0.5 Vi
Answer: C

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The quiescent collector current IC, and collector to emitter voltage VCE in a CE connection are the values when
A:
ac signal is zero
B:
ac signal is low
C:
ac signal is negative
D:
either (a) or (b)
Answer: A

Quiescent-operation means operation when ac signal is not applied.

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In a circuit of figure, Vs = 10 cos(ωt) power drawn by the 2Ω resistor is 4 watts. The power factor is
A:
0.3
B:
0.4
C:
0.6
D:
none
Answer: C

Vs = 10 cos ωt,

Let I be the current, then P = I2 R

I is the rms current.

Prms = I2 R 4 I2 = 4 I = 2A.

Total power drawn = Vm Im cos θ

10 x 2 cos θ = 10 cos θ

Total power cannot be determine until value of R = 12 Ω is given.

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Study the circuit of figure and examine the following statements
  1. It is an active low pass finer.
  2. It is a second order filter.
  3. The change in gain is 40 dB/decade.
Which of the above statements are correct?
A:
1, 2 and 3
B:
1 and 2
C:
1 and 3
D:
2 and 3
Answer: A

The circuit is a second order active low pass filter for which gain is 40 dB/decade.

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An amplifier with loop gain Aβ will be more stable for value of Aβ as
A:
0.95
B:
0.7
C:
1.2
D:
1.5
Answer: B

A feedback amplifier is stable if loop gain is less than unity. More less, more stable, hence β will be more stable.

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