Viva Questions on Transistor as an Amplifier Short Viva Questions with Answers o n Transistor as an Amplifier 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 the Input and output, then the transistor can be represented as a two-port network. Q.2. What do you mean by cascade amplifier? Ans. Cascade amplifier is a composite amplifier pair with a large bandwidth used for RF applications and as a video amplifier. It consists of a CE stage followed by a CB stage directly to each other and combines some of the features of both the amplifiers. For high frequency applications, CB configuration h...
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 Feedback (ii) Negative Feedback Q.3. Write the expressions for voltage gain with negative & positive feedback. Ans. The voltage gain with negative feedback will be Similarly, we can compute the voltage gain with positive feedback i.e., Q.4. List the merits of negative feedback. Ans. (i) ...
Viva Questions on Mobile Radio Propagation Short Answer type Viva Questions on Mobile Radio Propagation Q.1. What are the two basic types of communication channels? Ans. Basically, there are following two types of communication channels (i) wired channels (ii) radio or wireless channels The wired channels are stationary and predictable whereas the radio channels are extremely random and do not offer easy analysis. Even the speed of motion affects how rapidly the signal level fades as a mobile terminal moves in space. Therefore, it has been most difficult to model a radio channel in mobile radio system design. However, the model of a radio channel is achieved in a statistical manner which is based upon the measurement observed for the desired communication system or spectrum alloca...
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