• Electronics Devices & Circuits

    Field Effect Transistor (FET) Viva Questions

    Field Effect Transistor (FET) Viva Questions Field Effect Transistor (FET) Viva Questions, Viva Questions on Field Effect Transistor (FET), junction field-effect transistor (JFET) Viva Questions, MOSFET Viva Questions, Engineering Viva Questions, Electronics Devices Viva Questions Multistage Amplifiers Viva Questions Short Questions with Answers Q.1. What is a junction field-effect transistor (JFET)? Explain. Ans. The junction field-effect transistor (JFET) may be divided, depending on its structure, into the following two categories: N-channel JFET P-channel JFET. Q.2. What is the depletion region in JFET? Explain. Ans. Whenever a PN-junction is reverse-biased, the electrons and holes diffuse across the junction and leave behind the positive ions on the N-side and negative ions on…

  • Electronics Devices & Circuits

    Thyristor Family Viva Questions

    Thyristor Family Viva Questions Thyristor Family Viva Questions, Short Questions on Thyristor Family, Viva Questions on SCR, Triac Viva Questions, Gate Turn ON (GTO) Viva Questions, SCR Viva Questions, Diac Viva Questions, Viva Questions on IGBT, Electronics Device Viva Questions, Engineering Viva Questions Sinusoidal Oscillator Viva Questions Short Questions with Answers Q.1. Write the important features of SCR. Ans. Important Features of SCR It is a latching type device. It can handle a very large power. It is a current controlled device, because the gate current controls SCR. It acts as an open or closed switch. The on state voltage drop is very low. It can handle thousands of amperes…

  • Electronics Devices & Circuits

    Op-Amp Characteristics Viva Questions

    Op-Amp Characteristics Viva Questions Op-Amp Characteristics Viva Questions, Operational Amplifier Characteristics Viva Questions, Viva Questions on Op-Amp, Engineering Viva Questions, Electronics Device Circuits Viva Questions Short Questions with Answers Q.1. Define input Bias. Ans. It is defined as the average of the two DC currents at the inputs of an op-amp. Q.2. Define Input Impedance. Ans. It is defined as the impedance seen by a signal source at the input terminals of an amplifier. Q.3. Define input offset current. Ans. It is defined as the difference between the two op-amp input currents. Q.4. Define Input Offset Voltage. Ans. It is defined as the magnitude of DC voltage which, if applied…

  • Electronics Devices & Circuits

    Multistage Amplifiers Viva Questions

    Multistage Amplifiers Viva Questions Multistage Amplifiers Viva Questions, Viva Questions Multistage Amplifiers, Short Questions with Answers on Multistage Amplifiers, Engineering Viva Question, Electronics Device Circuits Viva Questions, Short Questions with Answers Q.1. What is gain? Ans. The ratio of output to the input of an amplifier is known as the gain of the amplifier. The output quantity may be current, voltage, or power. Generally, it is represented by the letter ‘G’ or ‘A’. Q.2. What do you mean by Decibel? Ans. The gain of an amplifier is the ratio of the output signal to the input signal of an amplifier, where input and output are of similar quantities having the…

  • Electronics Devices & Circuits

    Differential Amplifiers Viva Questions

    Differential Amplifiers Viva Questions Differential Amplifiers Viva Questions, Viva Questions on Differential Amplifiers, CMRR Viva Questions, Engineering Viva Questions, Electronics Device & Circuits, Short Questions with Answers Q.1. Define Common-mode Gain. Ans. It may be defined as the gain parameter fur an op-amp providing the ratio of common-mode output voltage to the common-mode input voltage. Q.2. What is Common-mode Voltage? Ans. It is a voltage that appears the same for both magnitude and phase at two separate terminals. Q.3. What do you mean by a Common – Mode Rejection Ratio? Ans. It is the ratio of differential gain to common-mode gain. Q.4. What is a Differential Amplifier? Ans. It is…

  • Electronics Devices & Circuits

    Sinusoidal Oscillator Viva Questions

    Sinusoidal Oscillator Viva Questions Sinusoidal Oscillator Viva Questions, Viva Questions on Sinusoidal Oscillator, Short Questions on Sinusoidal Oscillator, Electronic Devices & Circuits Viva Questions, Engineering Viva Questions Short Questions with Answers Q.1. What is the Barkhausen criterion? Ans. Barkhausen Criterion states that the frequency of a sinusoidal oscillator is determined by the condition that the loop-gain phase shift is zero. Hence It implies that i.e., magnitude of feedback factor = unity. or multiple of 2π Another interpretation of Barkhausen Criterion is Since gain is infinity we will get fainter output with no input. Q.2. What is a crystal oscillator? Ans. In crystal oscillators, the usual electrical resonant circuit is replaced…

  • Electronics Devices & Circuits

    Viva Questions on Transistor as an Amplifier

     Viva Questions on  Transistor as an Amplifier Viva Questions on  Transistor as an Amplifier, Viva Questions on Transistor as an Amplifier, Short Viva Questions Questions on Transistor as an Amplifier, Engineering Viva Questions, Electronics Devices Viva Questions Transistor in Hindi Short Viva Questions with Answers Q.1. What are the Hybrid Parameters (h-parameters)? Explain. Ans. Hybrid parameters are also called as h-parameters. Characteristics of amplifier can be specified easily in terms of h-parameters. The hybrid or h-parameters are very popular and widely used because them give accurate result and can be measured very easily. We know that a transistor is a three terminals device. If one terminal is made common to…

  • Electronics Devices & Circuits

    Feedback Viva Questions with answers

    Feedback Viva Questions with answers, Viva Questions on Feedback System, Engineering Viva Questions with Answer, Electronics Devices Viva Questions, Positive and Negative Feedback viva Questions with Answers Viva Questions With Answers Q.1. What is feedback? Ans. The feedback may be defined as a process of injecting some energy from the output and then return it back to the input. In other words, when a part or fraction of output is combined with the input, feedback is said to exist. Q.2. What are the types of feedback? Ans. Depending upon whether the feedback signal increases or decreases the input signal, there are two basic types of feedback in amplifiers. (i)                 Positive…

  • Electronics Devices & Circuits

    Semiconductor Devices Viva Questions

    Semiconductor Devices Viva Questions Semiconductor Devices Viva Questions, PN Junction Diode Viva Questions with Answers, P-N Junction Based Viva Questions, Electronics Devices Viva Questions, Engineering Viva Questions, Engineering Physics Viva Questions, Viva Questions on Semiconductor Devices, Short Answer Type Viva Questions on Semiconductor Devices, PN Junction Diode Viva Questions with Answers, Semiconductor Devices Viva Questions Short Viva Questions with Answers Q.1.What is doping? Ans. The process of adding impurity to a pure semiconductor is called doping. Doping is done at a rate such that only one atom of impurity is added per 106to 1010 semiconductor atoms. Q.2.What are the types of extrinsic semiconductors? Ans. Depending upon the types of impurity…