Analog Electronics MCQ Questions & Answers

21

Quartz crystal is mostly used in crystal oscillator because

A) It is easily available B) It has superior electrical properties C) It is quite inexpensive D) It is very rugged

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Answer & Solution

Answer: Option B

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22

A microphone is connected between the base and the ground of a BJT. A 1 kΩ resistance is connected between the collector V_CC. If I_s = 6 × 10^-16 A and the peak value of the microphone signal is 20 mV, what is the peak value of the output signal?

A) 1.29 × 10^-16 V B) 1.29 × 10^-6 V C) 1.29 × 10^-12 V D) 1.29 × 10^-14 V

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Answer & Solution

Answer: Option C

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23

Consider the oscillator circuit shown in the figure. The function of the network (shown in dotted lines) consisting of the 100 kΩ resistor in series with the two diodes connected back-to-back is to:
Analog Electronics mcq question image

A) Introduce amplitude stabilization by preventing the op-amp from saturating and thus producing sinusoidal oscillations of fixed amplitude B) Introduce amplitude stabilization by forcing the op-amp to swing between positive and negative saturation and thus producing square wave oscillations of fixed amplitude C) Introduce frequency stabilization by forcing the circuit to oscillate at a single frequency D) Enable the loop gain to take on a value that produces square wave oscillations

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Answer & Solution

Answer: Option A

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24

Reverse saturation current in the collector region of a transistor

A) Increases with temperature B) Decreases with temperature C) Is not affected by temperature D) Is affected by base current

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Answer & Solution

Answer: Option A

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25

Which of the following can be magnified by magnetic amplifiers

A) Voltage B) Current C) Power D) None of the above

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Answer & Solution

Answer: Option C

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26

An ideal value of input resistance of trans resistance amplifier is.

A) infinity B) zero C) low D) high

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Answer & Solution

Answer: Option B

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27

The efficiency of a Class - B amplifier for a supply of V_CC = 24 V and peak output voltages V_L(P) = 22 V is

A) 41.2% B) 72% C) 19.6% D) 29.1%

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Answer & Solution

Answer: Option B

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28

A multistage amplifier employs five stages each of which has a power gain of 30? The total gain of the amplifier in dB is . . . . . . .
(log₁₀ 30 = 1.477)

A) 150 dB B) 75 dB C) 73.85 dB D) 100 dB E) 147.7 dB

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Answer & Solution

Answer: Option C

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29

Which of the following indicates 2^nd harmonic distortion in power amplifier?

A) $$\frac{{\left| {{{\text{A}}_2}} \right|}}{{\left| {{{\text{A}}_1}} \right|}}$$ B) $$\frac{{\left| {{{\text{A}}_3}} \right|}}{{\left| {{{\text{A}}_2}} \right|}}$$ C) $$\frac{{\left| {{{\text{A}}_4}} \right|}}{{\left| {{{\text{A}}_2}} \right|}}$$ D) $$\frac{{\left| {{{\text{A}}_1}} \right|}}{{\left| {{{\text{A}}_2}} \right|}}$$

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Answer & Solution

Answer: Option A

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30

Consider the following statements:
Monolithic regulators can be used to
1. Realize a constant voltage regulator.
2. Realize a constant current regulator.
3. Introduce flexibility in setting output voltage level.
Of these statements

A) 1 and 2 are correct B) 1 and 3 are correct C) 2 and 3 are correct D) 1, 2 and 3 are correct

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Answer & Solution

Answer: Option B

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Analog Electronics MCQ Questions & Answers | ECE