The Following are the VIVA question for PCOM:

QUESTIONS

Q.1. What is trunking ?
Q.2. What is crystal radio?
Q.3. What is inter modulation ?
Q.4. What is cross modulation ?
Q.5. How is information related to bandwidth ?
Q.6. What is stray capacitance ?
Q.7. What do you mean by antenna coupling ?
Q.8. Mention the advantages and disadvantage of SSB over DSB and AM ?
Q.9. Mention the special requirements of SSB and ISB receiver ?
Q.10 Describe the term FM thresholding ?
Q.11 Explain the advantages and disadvantages of FM ?
Q.12 Explain the dynamic range of receiver ?
Q.13 What is the standard sampling frequency for speech signals ?
Q.14 Explain the term- aperture effect ?
Q.15 Advantages and disadvantages of digital modulation ?
Q.16 what radio frequencies are used for what purpose ?
Q.17 What is tank circuit ?
Q.18 What is carrier shift? What does it indicate ?
Q.19 Why do any amplifier that follow the modulator circuit in an AM DSB-FC transmitter have to be linear ?
Q.20 Give the difference between 100% modulated DSB-FC and DSB-SC signal ?
Q.21 How varactor diode act as variable capacitance ?
Q.22 What is δ and mf (modulation index) ?
Q.23 Explain why FM is more immune to noise than AM ?
Q.24 What is capture effect?
Q.25 What is AFC ? Give block diagram ?
Q.26 Draw the block diagram of Crosby direct FM transmitter and explain its operation ?
Q.27 If voice signal is PCM encoded, using 8 bit PCM, what is the output bit rate ?

Courtesy: Author: Vicky Jain. Publisher: Nandu publications

For more questions with complete answers refer to PCOM book by Vicky jain from Nandu publications