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Differential Amplifier Question & Answers

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This article lists 50 Differential Amplifier MCQs for engineering students. All the Differential Amplifier Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, or interviews, or professionals who would like to brush up on the fundamentals of the Differential Amplifier.

Differential amplifiers are the basic essential blocks of operational amplifiers. It is the most powerful circuit present at the front end of various comparators, Audio amplifiers, or op-amps.  The purpose of this amplifier is to amplify the difference of both the signals applied at input terminals.

Integrated circuits present in analog systems are built by using differential amplifiers. A circuit that produces output Voltage that is in proportion to the voltage differences amid both the signals applied at the input is referred to as a Differential Amplifier.

This amplifier behaviour resembles a subtractor i.e., basically signals applied at the input are subtracted. These differential amplifiers are constructed using FETs and BJTs. Three terminals are present in this amplifier among those three, two of the terminals are used as input i.e., Inverting and Non-inverting.

Differential amplifier circuits are simple in terms of amplifying the signals as well as the noise present in the signals is rejected. Two outputs and two inputs are in this amplifier. It has improved the Common Mode Rejection ratio (CMRR).

1). Differential amplifier amplifies __________ between both voltages applied at input?

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2). The current at collector is equal in ____________?

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3). ___________ is a Voltage Subtractor circuit?

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4). Differential amplifier produces the voltage at output is in proportion to __________?

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5). What are the terminals of a Differential amplifier?

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6). What is the output of the Differential amplifier in Ideal conditions?

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7). Common-mode Gain should be __________ in Differential amplifier?

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8). The ratio of differential and common-mode gains is known as __________?

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9). What determines the amplifier’s ability to cancel voltages common in both situations of inputs?

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10). What will be the common-mode gain for a perfect symmetric Differential amplifier?

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11). What will be the CMRR of a perfect symmetric Differential amplifier?

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12). What is the formula to calculate CMRR?

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13). Biasing points of the Long-tail resistor network are determined using _____?

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14). How many transistors are used in the Common Emitter configuration of the Differential amplifier?

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15). What are the various modes of Differential amplifiers?

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Differential Amplifier MCQs for Quiz 

16). Differential amplifier is the combination of __________?

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17). What is created if flow of signals has a similar direction?

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18). What is created if flow of signals has distinct directions?

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19). How noise is removed from the Differential amplifier?

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20). Differential amplifiers are _________ by nature?

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21). While operating differential amplifier, it rejects ________signals?

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22). What is the output if there are no differences in the input in differential amplifiers?

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23). A Differential amplifier consists of _______?

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24). In what mode the input is applied at one terminal?

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25). In what mode two inputs are applied at the amplifier terminals?

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Differential Amplifier MCQs for Exams

26). In a differential amplifier _________ are amplified highly?

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27). What is the configuration used in differential amplifiers?

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28). The outcome in differential amplifier collected across two collector terminals is known as __________?

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29). The outcome in differential amplifier collected across one collector terminal is known as __________?

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30). In a differential amplifier, if the input is applied at both the terminals is referred to as _______?

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31). If the input in the differential amplifier is applied at one terminal and the other is grounded is known as ___________?

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32). What are the various configurations of differential amplifiers?

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33). What is the basic configuration of the differential amplifier?

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34). What is the output equation of a Differential amplifier?

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35). What is the output of the differential amplifier if V1 is 30 milli volts and V2 is 40 milli volts with Ad is 80?

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 Differential Amplifier MCQs for Interviews 

36). By increasing the resistance value of the emitter in a differential, what happens to common mode gain?

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37). What are the drawbacks of differential amplifiers?

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38). Automatic gain control circuit uses __________?

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39). What are the various applications of Differential amplifiers?

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40). Which amplifier can be used in a Negative Feedback circuit?

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41). _________ modulation purpose differential amplifiers are utilized?

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42). Why differential amplifier is used in Audio amplifiers?

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43). What is reduced by using differential amplifiers?

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44). Which amplifier is used for noise suppression?

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45). Input stage of Emitter coupled logic gates is ___________?

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46). A Long-tailed pair is utilized as _______?

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47). Long-tailed pair of arrangement in discrete electronic systems is to implement _________ amplifier?

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48). Differential amplifiers are used in ________?

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49). Servos or Motors are controlled using ________?

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50). Which amplifiers are preferred in the circuit made of Series Negative Feedback?

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