Analog Electronics - Study Mode

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[#321] If an amplifier with gain of -1000 and feedback factor of β = -0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be

(A) 10%

(B) 5%

(C) 0.2%

(D) 0.01%

Correct Answer

(C) 0.2%

[#322] For the junction transistor, which of the following relation is true?

(A) $$alpha = frac{x08eta }{{x08eta - 1}}$$

(B) $$alpha = x08eta left( {1 + x08eta } ight)$$

(C) $$x08eta = frac{alpha }{{1 - alpha }}$$

(D) $$x08eta = frac{alpha }{{1 + alpha }}$$

Correct Answer

(C) $$x08eta = frac{alpha }{{1 - alpha }}$$

[#323] An op-amp having input voltage V i 1 = 150 µV and V i 2 = 140 µV, differential gain A d = 4000 and CMRR = 10 5 . The output voltage of op-amp will be

(A) 45.8 mV

(B) 45.102 mV

(C) 40.006 mV

(D) 42.6 mV

Correct Answer

(C) 40.006 mV

[#324] The load impedance Z L of common emitter amplifier has R and L in series. The phase difference between output and input will be

(A) 180°

(B) More than 180° but less than 270°

(C) 0°

(D) More than 90° but less than 180°

Correct Answer

(B) More than 180° but less than 270°

[#325] Match List-I with List-II and select the correct answer using the options given below the lists: List-I (Name of the circuit) List-II (Characteristics of the circuit) a. Darlington Amplifier 1. A circuit using pnp and npn transistors used in power amplifier. b. Common base Amplifier 2. A Common-source Amplifier driving a common gate amplifier. c. Complementary Symmetry Amplifier 3. A Circuit with overall voltage gain close to 1 and very large input impedance. d. Cascode Amplifier 4. A Circuit with low input impedance mainly used in high frequency applications.

(A) a-1, b-2, c-3, d-4

(B) a-2, b-1, c-4, d-3

(C) a-3, b-4, c-1, d-2

(D) a-4, b-3, c-2, d-1

Correct Answer

(C) a-3, b-4, c-1, d-2