Explore topic-wise MCQs in Electronic Devices and Circuits Questions and Answers.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices and Circuits Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

If Av, Ai and Ap represents the voltage gain, current gain and power gain ratio of an amplifier which of the below is not the correct expression for the corresponding values in decibel?

A. Current gain: 20 log Ai db
B. Voltage gain: 20 log Av db
C. Power gain: 20 log Ap db
D. Power gain: 10 log Ap
Answer» D. Power gain: 10 log Ap
Discussion
2.

Which of the following isn’t true?

A. Both transformer and amplifier can provide voltage gain
B. Both transformer and amplifier can provide current gain
C. Both transformer and amplifier can provide power gain
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
3.

Statement 1: Voltage gain of -5 means that the output voltage has been attenuated.

A. Statement 2: Voltage gain of -5db means that the output voltage has been attenuated.
B. Statement 1 and Statement 2 are true
C. Statement 1 and Statement 2 are false
D. Only Statement 1 is true
E. Only Statement 2 is true
Answer» E. Only Statement 2 is true
Discussion
4.

An amplifier operating from ±3V provide a 2.2V peak sine wave across a 100 ohm load when provided with a 0.2V peak sine wave as an input from which 1.0mA current is drawn. The average current in each supply is measured to be 20mA. What is the amplifier efficiency?

A. 20.2%
B. 25.2%
C. 30.2%
D. 35.2%
Answer» B. 25.2%
Discussion