30-05-2013, 11:37 AM
TERM TEST – II
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PART – A
1 What do you mean by narrowband and wideband FM?.
2. State Carson’s rule of FM bandwidth?
3. What is meant by indirect FM generation?
4. Illustrate the relationship between FM and PM, with block diagrams
5. Compare the transmission bandwidth required for Narrowband FM and Wide band FM
6. Draw the block diagram of a method for generating a narrowband FM signal.
7. What is the bandwidth required for an FM wave in which the modulating frequency signal
is 2 KHz and the maximum frequency deviation is 12 KHz?
8. Determine and draw the instantaneous frequency of a wave having a total phase angle
given by ø(t)= 2000t +sin10t.
9. Mention the Advantages of Angle modulation over AM
10. Give any two differences between FM and PM.
PART – B
11) a) Derive the expression for the frequency modulated signal. Explain what is meant by
Narrowband FM and wideband FM using the expression.
{OR}
b) Draw the frequency spectrum of FM and explain. Explain how Varactor diode can be used
for frequency modulation
12. a) Draw the circuit diagram of Foster-Seelay discriminator and explain its working.
{OR}
b) i) In an FM System, if the maximum value of deviation is 75khz and the maximum modulating frequency is 10khz, calculate the deviation ratio and bandwidth of the system using carson’s rule?
(ii) Comparison for FM and AM signal.