Analog Electronics MCQ Questions & Answers

1

In the following limiter circuit, an input voltage V_i = 10 sin 100 πt is applied. Assume that the diode drop is 0.7 V when it is forward biased. The zener breakdown voltage is 6.8 V
Analog Electronics mcq question image

The maximum and minimum values of the output voltage respectively are

A) 6.1 V, -0.7 V B) 0.7 V, -7.5 V C) 7.5 V, -0.7 V D) 7.5 V, -7.5 V

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Answer & Solution

Answer: Option C

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2

Which power amplifier conducts from 0° to 180°

A) Class-A B) Class-B C) Class-AB D) Class-C

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Answer & Solution

Answer: Option B

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3

For the Schmitt trigger circuit shown in figure, assuming diodes and op-amp are ideal, the value of lower and upper threshold points of voltage transfer characteristics, respectively, are
Analog Electronics mcq question image

A) -8 V, +5 V B) -5 V, +5 V C) -5 V, +8 V D) -8 V, +8 V

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Answer & Solution

Answer: Option C

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4

A small signal voltage amplifier in common emitter configuration was working satisfactorily. Suddenly its emitter bypass capacitor (C_E) got disconnected. Its:
1. Voltage gain will decrease
2. Voltage gain will increase
3. Bandwidth will decrease
4. Bandwidth will increase
Which of these statements are correct?

A) 1 and 4 only B) 2 and 3 only C) 3 and 4 only D) 1, 2, 3 and 4

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Answer & Solution

Answer: Option A

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5

A Schmitt trigger circuit achieves hysteresis by utilizing

A) The magnetic properties of transformer core B) Avalanche multiplication in a Zener diode C) The Barkhausen principle D) Regenerative positive feedback

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Answer & Solution

Answer: Option D

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6

Match the following.

List-I	List-II
a. Hartley	1. Low frequency oscillator
b. Wien-bridge	2. High frequency oscillator
c. Crystal	3. Stable frequency oscillator

A) a-2, b-1, c-3 B) a-1, b-2, c-3 C) a-2, b-3, c-1 D) a-3, b-1, c-2

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Answer & Solution

Answer: Option A

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7

Current stability of a CC amplifier can be increased by

A) Reducing both emitter and base resistance B) Increasing both emitter and base resistance C) Reducing emitter resistance and increasing base resistance D) Increasing emitter resistance and decreasing base resistance E) Keeping emitter resistance and base resistance to same value

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Answer & Solution

Answer: Option D

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8

Three identical amplifiers with each one having a voltage gain of 50, input resistance of 1 kΩ and output resistance of 250 Ω, are cascaded. The open circuit voltage gain of the combined amplifier is

A) 49 dB B) 51 dB C) 98 dB D) 102 dB

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Answer & Solution

Answer: Option C

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9

In a particular biasing circuit, the value of R_E is about . . . . . . . .

A) 10 kΩ B) 1 MΩ C) 100 kΩ D) 800 Ω

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Answer & Solution

Answer: Option D

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10

In the circuit shown below, the switch was connected to position 1 at t < 0 and at t = 0, it is changed to position 2. Assume that the diode has zero voltage drop and a storage time t_s. For 0 < t ≤ t_s.V_Rs given by (all in Volts)
Analog Electronics mcq question image

A) V_R = -5 B) V_R = +5 C) 0 ≤ V_R < 5 D) -5 < V_R < 0

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Answer & Solution

Answer: Option A

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Analog Electronics MCQ Questions & Answers | ECE