Electronic Devices Circuits Amplifiers Online Exam Quiz
Electronic Devices Circuits Amplifiers GK Quiz. Question and Answers related to Electronic Devices Circuits Amplifiers. MCQ (Multiple Choice Questions with answers about Electronic Devices Circuits Amplifiers
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?
Options
A : 20.2%
B : 25.2%
C : 30.2%
D : 35.2%
An amplifier has a voltage gain of 100 V/V and a current gain of 1000A/A. the value of the power gain decibel is
Options
A : 30 db
B : 40 db
C : 50 db
D : 60 db
The voltage gain of the amplifier is 8 and the current gain is 7. The power gain of the amplifier is
Options
A : 56 db
B : 17.481 db
C : 34.963 db
D : 1 db
Which of the following isn’t true?
Options
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
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?
Options
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
In order to prevent distortion in the output signal after amplification, the input signal must be
Options
A : Higher than the positive saturation level of the amplifier
B : Lower than the negative saturation level of the amplifier
C : Must lie with the negative and the positive saturation level of the amplifier
D : Both higher than the positive saturation level of the amplifier and lower than the negative saturation level of the amplifier
The units of voltage gain is
Options
A : It has no units, it is a ratio
B : Decibels (db)
C : All of the mentioned
D : None of the mentioned
Symmetrically saturated amplifiers operating in clipping mode can be used to convert a sine wave to a
Options
A : Square wave
B : Pseudo Square wave
C : Sawtooth wave
D : Triangular wave
What is meant by stability of the an amplified signal?
Options
A : The amplified signal must have a finite amplitude
B : The amplified signal should not have self oscillation
C : The input and the output signal must be proportional
D : The ratio of the input and the output signal must be finite
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