question_answer1) Name the type of communication systems according to the mode of the transmission.
question_answer2) What is meant by the term modulation?
question_answer3) Write a single equation to express amplitude, frequency and phase modulation.
question_answer4) Why is modulation needed at all?
question_answer5) Why do we need carrier waves of very high frequency in the modulation of signals?
question_answer6) Define modulation factor. Give its significance.
question_answer8) How does the amplitude of the carrier wave vary in AM?
question_answer10) What happens when modulation factor exceeds unity in AM?
question_answer11) What are the three frequencies contained in an AM wave? What are LSB and USB?
question_answer12) Write an expression for the bandwidth of an AM transmission?
question_answer13) Which is better for high fidelity reception: FM or AM?
question_answer14) Which is more efficient mode of transmission: FM or AM?
question_answer15) What is function of amplitude limiters used in FM receivers?
question_answer16) What is meant by sensitivity of a radio receiver?
question_answer17) What is meant by selectivity of a radio receiver?
question_answer25) Why are short wave bands used for long distance transmission of signals?
question_answer27) Give the reason why transmission of TV signals via sky waves is not possible.
question_answer28) It is necessary to use satellites for long distance T.V. transmission. Why?
question_answer30) What is switching circuit in a telephone system?
question_answer31) What is the origin of the word modem?
question_answer32) What is the function of a FAX?
question_answer33) Name the factor which decides the quality of reproduced document sent by a FAX.
question_answer34) What is the difference between telegraphy and teleprinting?
question_answer40) Distinguish between analog and digital communications.
question_answer63) Give some limitations of amplitude modulation.
question_answer64) Give some advantages of AM over FM transmission.
question_answer65) Give some advantages of FM over AM transmission.
question_answer66) Give some advantages of digital communication.
question_answer67) Distinguish between a FAX and E-mail.
You need to login to perform this action.
You will be redirected in
3 sec
Name the two bask modes of communication. Which of these modes is used for telephonic communication? 
the (i) input AM wave at A, (ii) output, B, of the rectifier g and (iii) output signal, C, of the envelope detector. 