Analog Electronics MCQ Questions & Answers

71

The low frequency gain of LPF shown is
Analog Electronics mcq question image

A) 10 dB B) 20 dB C) 30 dB D) 40 dB

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Answer & Solution

Answer: Option D

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72

The bandwidth of a double tuned transformer coupled amplifier can be adjusted by varying the

A) coupling coefficient B) value of the inductance C) value of the emitter biasing resistance D) value of resistance

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Answer & Solution

Answer: Option A

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73

The amplifier circuit shown below uses a silicon transistor. The capacitors C_C and C_E can be assumed to be short at signal frequency and the effect of output resistance r₀ can be ignored. If C_E is disconnected from the circuit, which one of the following statements is TRUE?
Analog Electronics mcq question image

A) The input resistance R_i increases and voltage gain A_i decreases B) The input resistance R_i decreases and voltage gain A_i increases C) Both input resistance R_i and voltage gain A_v decreases D) Both input resistance R_i and voltage gain A_v increases

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Answer: Option A

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74

The current gain of bipolar transistor drops at high frequency because of

A) Transistor capacitances B) High current effects in the base C) Parasitic inductive elements D) The early effect

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Answer: Option A

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75

Most of the linear ICs are bases on two transistor differential amplifiers because of

A) Input voltage-dependent linear transfer characteristic B) High voltage gain C) High input resistance D) High CMRR

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Answer: Option D

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76

An amplifier has an open loop gain of 1000±10. Negative feedback is provided such that the gain variation remains within 0.1%. What is the amount of feedback β_F?

A) $$\frac{1}{{10}}$$ B) $$\frac{1}{9}$$ C) $$\frac{9}{{100}}$$ D) $$\frac{9}{{1000}}$$

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Answer & Solution

Answer: Option D

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77

For the circuit given below, the voltage V₀ across the op-amp output is:
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A) -9V_i B) -3V_i C) -11V_i D) 9V_i

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Answer & Solution

Answer: Option C

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78

In phase-shift oscillator, a single RC network introduces a phase change of

A) 360° B) 180° C) 90° D) 60°

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Answer & Solution

Answer: Option D

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79

The feedback factor β for a voltage shunt feedback amplifier is given by

A) $$\beta = \frac{{{{\text{V}}_{\text{f}}}}}{{{{\text{V}}_{\text{o}}}}}$$ B) $$\beta = \frac{{{{\text{I}}_{\text{f}}}}}{{{{\text{I}}_{\text{o}}}}}$$ C) $$\beta = \frac{{{{\text{I}}_{\text{f}}}}}{{{{\text{V}}_{\text{o}}}}}$$ D) $$\beta = \frac{{{{\text{V}}_{\text{f}}}}}{{{{\text{I}}_{\text{o}}}}}$$

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Answer & Solution

Answer: Option A

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80

Which of the following principles is applied while designing the output matching network for a high power Class-C amplifier?

A) Maximum Power Transfer Theorem B) Norton's Theorem C) Thevenin's Theorem D) Power = (voltage)²/R_L

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Answer: Option A

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Analog Electronics MCQ Questions & Answers | ECE