Analog Electronics MCQ Questions & Answers

81

An amplifier using BJT has two identical stages each having a lower cut-off (3 dB) frequency of 64 Hz due to coupling capacitor. The emitter bypass capacitor also provides a lower cut-off (3 dB) frequency due to emitter degeneration alone of 64 Hz. The lower (3 dB) frequency of the overall amplifier is nearly

A) 100 Hz B) 128 Hz C) 156 Hz D) 244 Hz

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Answer: Option A

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82

What would be the output of the following circuit, if a positive going unipolar pulse with an amplitude greater than V_ref, is applied at the input?
Analog Electronics mcq question image

A) V_o will go high momentarily and return to low B) V_o will go low momentarily and return to high C) V_o will go high and remain high D) V_o will not change its previous state

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Answer: Option C

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83

A high gain OpAmp has R_f = 10⁵Ω & R_i = 10³Ω. The correct statements is:

A) The non-inverting gain & inverting gain are nearly same B) The inverting gain is very much higher than non-inverting gain C) The non-inverting gain is very much higher than inverting gain D) The inverting & non-inverting gains are unrelated

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Answer: Option A

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84

The V₀ of the op-amp circuit shown in the given figure is
Analog Electronics mcq question image

A) 11 V_i B) 10 V_i C) V_i D) zero

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Answer: Option D

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85

The main advantage in using three op-amp instrumentation amplifier over a single stage op-amp differential amplifier lies in

A) Higher value of CMRR B) Lower noise figure C) Elimination of the need for accurate matching of resistor D) Simplicity of gain adjustment

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Answer: Option C

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86

In the circuit shown in the given figure, R_F provides
Analog Electronics mcq question image

A) Current series feedback B) Current shunt feedback C) Voltage series feedback D) Voltage shunt feedback

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Answer: Option D

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87

An n-channel enhancement mode MOSFET is biased at V_GS > V_TH and V_DS > (V_GS - V_TH), where V_GS is the gate-to-source voltage. V_DS is the drain-to-source voltage and V_TH is the threshold voltage. Considering channel length modulation effect be significant, the MOSFET behaves as a

A) Voltage source with zero output impedance B) Voltage source with non-zero output impedance C) Current source with finite output impedance D) Current source with infinite output impedance

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Answer: Option C

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88

For an OPAMP, unity gain frequency is 10⁶ if gain is 20, What is the Bandwidth of the op-amp . . . . . . . .

A) 60 kHz B) 50 kHz C) 40 kHz D) 100 kHz

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Answer: Option B

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89

The cross-over distortion in class B push-pull amplifier is eliminated by

A) Operating the amplifier as class C B) Operating the amplifier as class AB C) Eliminating the output transformer D) Reducing the biasing of the transistors

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Answer: Option D

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90

The transfer function of a second order low pass filter shown in Figure is
Analog Electronics mcq question image

A) $$\frac{1}{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 3{\text{RCs}} + 1}}$$ B) $$\frac{{{\text{RCs}}}}{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 3{\text{RCs}} + 1}}$$ C) $$\frac{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 1}}{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 3{\text{RCs}} + 1}}$$ D) $$\frac{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2}}}{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 3{\text{RCs}} + 1}}$$

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Answer: Option A

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Analog Electronics MCQ Questions & Answers | ECE