6. The difference between phase and frequency modulation :
(a) Lies in the different definition of the modulation index
(b) Is too great to make the two systems compatible
(c) Is purely theoretical because they are the same in practice
(d) Lies in the poorer radio response of phase modulation index
7. Which one of the following is not necessarily an advantage of FM over AM ?
(a) Better noise immunity is provided
(b) The transmitted power is more useful
(c) Lower bandwidth is required
(d) Less modulating power is required
8. In FM, the frequency deviation is :
(a) Constant
(b) Zero
(c) Proportional to modulating frequency
(d) Proportional to amplitude of modulating signal
9. In phase modulated signal, the frequency deviation proportional to :
(a) Frequency only
(b) Amplitude only
(c) Both a and b
(d) None of the above
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