# Electronics and Communication Engineering - Analog Electronics

26.

Two 3Ω speakers in series will have a total impedance of

 A. 1 Ω B. C. 3 Ω D. 6 Ω

Explanation:

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27.

The input resistance Ri of the amplifier shown in the figure

 A. B. 100 kΩ C. 40 kΩ D. ∞

Explanation:

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28.

In a CE amplifier the ac signal is increased. Which of the following will not change?

 A. Ac base voltage B. Ac collector voltage C. Ac emitter voltage D. Ac collector voltage and ac emitter voltage

Explanation:

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29.

The ideal op-amp has the following characteristics

 A. Ri = ∞, A = ∞, R0 = 0 B. Ri = 0, A = ∞, R0 = 0 C. Ri = ∞, A = 0, R0 = 0 D. Ri = 0, A = ∞, R0 = ∞

Explanation:

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30.

The input differential stage of op-amp. 741 is baised at about 10 μA current such a low current of the input stage gives

1. high CMRR
2. high differential gain
3. low differential
4. high input impedance
Which of these are correct?

 A. 1 and 2 B. 1, 2 and 4 C. 3 and 4 D. 1, 2, 3 and 4