Analog Electronics MCQ Questions & Answers

41

For the junction transistor, which of the following relation is true?

A) $$\alpha = \frac{\beta }{{\beta - 1}}$$ B) $$\alpha = \beta \left( {1 + \beta } \right)$$ C) $$\beta = \frac{\alpha }{{1 - \alpha }}$$ D) $$\beta = \frac{\alpha }{{1 + \alpha }}$$

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Answer & Solution

Answer: Option C

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42

An op-amp having input voltage V_i₁ = 150 µV and V_i₂ = 140 µV, differential gain A_d = 4000 and CMRR = 10⁵. The output voltage of op-amp will be

A) 45.8 mV B) 45.102 mV C) 40.006 mV D) 42.6 mV

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Answer & Solution

Answer: Option C

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43

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°

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Answer & Solution

Answer: Option B

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44

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

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Answer & Solution

Answer: Option C

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45

The overall bandwidth of two identical voltage amplifiers connected in cascade will be:

A) same as single stage B) higher than single stage C) lower than single stage D) higher if stage gain is low and lower if stage gain is high

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Answer & Solution

Answer: Option C

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46

The voltage transfer characteristics as shown in the figure will relate to a
1. Voltage regulator
2. Half-wave rectifier
3. Full-wave rectifier
Which of the above is/are correct?
Analog Electronics mcq question image

A) 1 only B) 2 only C) 1 and 2 D) 1 and 3

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Answer & Solution

Answer: Option A

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47

A 5 mV, 1 kHz sinusoidal signal is applied to the input of an op-amp integrator for which R = 100 kΩ and C = 1 µF. the output voltage is:

A) $$\frac{1}{{40\pi }}\cos \left( {2000\pi t - 1} \right)$$ B) $$\cos \left( {2000\pi t - 1} \right)$$ C) $$\frac{{ - 1}}{{40\pi }}\cos \left( {2000\pi t - 1} \right)$$ D) $$ - \cos \left( {2000\pi t - 1} \right)$$

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Answer & Solution

Answer: Option A

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48

The function of the diode D in the timer circuit shown below is to
Analog Electronics mcq question image

A) Increase the charging time of C B) Decrease the charging time of C C) Increase the discharging time of C D) Decrease the discharging time of C

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Answer & Solution

Answer: Option D

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49

An op-amp is used as a zero-crossing detector. If the maximum output voltage is ±15 Volt p-p and the slew rate is 10 V/µsec, then the maximum frequency will be

A) 106 Hz B) 10.6 Hz C) 106 kHz D) 10.6 kHz

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Answer & Solution

Answer: Option C

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50

A voltage V_G is applied across a MOS capacitor with metal gate and p-type silicon substrate at T = 300 K. The inversion carrier density (in number of carriers per unit area) for V_G = 0.8 V is 2 × 10¹¹ cm^-2. For V_G = 1.3 V, the inversion carrier density is 4 × 10¹¹ cm^-2. What is the value of the inversion carrier density for V_G = 1.8 V?

A) 4.5 × 10¹¹ cm^-2 B) 6.0 × 10¹¹ cm^-2 C) 7.2 × 10¹¹ cm^-2 D) 8.4 × 10¹¹ cm^-2

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Answer & Solution

Answer: Option B

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Analog Electronics MCQ Questions & Answers | ECE