Analog Electronics MCQ Questions & Answers

41

The dissipation at the collector is zero in the quiescent state and increase with excitation in the case of a

A) Class A series-fed amplifier B) Class A transistor coupled amplifier C) Class AB amplifier D) Class B amplifier

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Answer & Solution

Answer: Option D

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42

The responsivity of the PIN photodiode shown is 0.9 A/W. To obtain V_out of -1 V for an incident optical power of 1 mW, the value of R to be used is

A) 0.9 Ω B) 1.1 Ω C) 0.9 kΩ D) 1.1 kΩ

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Answer & Solution

Answer: Option D

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43

In the circuit shown below assume that diodes and op-amp are ideal. Suppose that V₀₁ is the output voltage when input voltage is V_s = -1.0 V and V₀₂ is the output voltage when input voltage is V_s = +1.0 V, then the value of V₀₁ + V₀₂ is
Analog Electronics mcq question image

A) 2.0 V B) -0.5 V C) 0.5 V D) 0.0 V

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Answer & Solution

Answer: Option C

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44

The circuit shown in figure is a
Analog Electronics mcq question image

A) positive peak clipper B) positive clamper C) differentiator D) negative clamper

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Answer & Solution

Answer: Option B

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45

Consider the following circuit using an ideal op-amp. The I-V characteristics of the diode is described by the relation $${\text{I}} = {{\text{I}}_0}\left( {{{\text{e}}^{\frac{{\text{V}}}{{{{\text{V}}_{\text{T}}}}}}} - 1} \right)$$ where V_T = 25 mV, I₀ = 1 µA and V is the voltage across the diode (taken as positive for forward bias).
For an input voltage V_i = -1 V, the output voltage V₀ is
Analog Electronics mcq question image

A) 0 V B) 0.1 V C) 0.7 V D) 1.1 V

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Answer & Solution

Answer: Option B

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46

A second-order band-pass active filter can be obtained by cascading a low-pass second-order section having cut-off frequency f_OH with a high-pass second-order section having cut-off frequency f_OL, provided

A) f_OH > f_OL B) f_OH < f_OL C) f_OH = f_OL D) f_OH $$ \leqslant \frac{1}{2}$$ f_OL

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Answer & Solution

Answer: Option A

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47

In the circuit shown in figure is a finite gain amplifier with a gain of K, a very large input impedance, and a very low output impedance. The input impedance of the feedback amplifier with the feedback impedance Z connected as shown will be
Analog Electronics mcq question image

A) $${\text{Z}}\left[ {1 - \frac{1}{{\text{K}}}} \right]$$ B) $${\text{Z}}\left( {1 - {\text{K}}} \right)$$ C) $$\left[ {\frac{{\text{Z}}}{{{\text{K}} - 1}}} \right]$$ D) $$\left[ {\frac{{\text{Z}}}{{1 - {\text{K}}}}} \right]$$

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Answer & Solution

Answer: Option D

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48

In a log amplifier the input is 'a'. The output will be proportional to

A) log a B) 2.3 log a C) log 20 a D) None of these

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Answer & Solution

Answer: Option A

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49

Diodes are used to clip voltages in circuits because they act as:

A) current sources under certain bias conditions B) voltage sources under certain bias conditions C) inductors that can remove spikes D) dependent current sources

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Answer & Solution

Answer: Option B

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50

An n-type MOSFET and an npn BJT are biased so that I_C = I_D = 1 mA, V_GS = 1.3 V and V_BE = 0.7 V. Threshold voltage for the MOSFET is 0.8 V and thermal voltage at the ambient temperature is given to be 25 mV. Transconductances of the BJT and the MOSFET are:

A) g_mBJT = 40 mA/V and g_mMOSFET = 4 mA/V B) g_mBJT = 40 mA/V and g_mMOSFET = 2.5 mA/V C) g_mBJT = 80 mA/V and g_mMOSFET = 2 mA/V D) g_mBJT = 80 mA/V and g_mMOSFET = 4 mA/V

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Answer & Solution

Answer: Option A

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Analog Electronics MCQ Questions & Answers | ECE