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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 1
46.
In a circuit of figure, Vs = 10 cos(ωt) power drawn by the 2Ω resistor is 4 watts. The power factor is
0.3
0.4
0.6
none
Answer: Option
Explanation:

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.

47.
The quiescent collector current IC, and collector to emitter voltage VCE in a CE connection are the values when
ac signal is zero
ac signal is low
ac signal is negative
either (a) or (b)
Answer: Option
Explanation:

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

48.
In the op-amp circuit of figure, V0 =
Vi
3 Vi
5 Vi
0.5 Vi
Answer: Option
Explanation:

.

49.
Figure shows the self bias circuit for CE amplifier and its equivalent circuit. VBB and RB respectively are
10 V and 4 k ohm
5 V and 4 k ohm
2 V and 4 k ohm
2 V and 10 k ohm
Answer: Option
Explanation:

.

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