When the frequency of a sinusoidal message signal is increased by keeping all other parameters of modulator constant,

B W

of both

P M

and

F M

signals increase by same factor

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B W

P M

signal increases more than that of

F M

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No such conclusion can be deduced.

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B W

F M

signal increases more than that of

P M

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Solution

The correct option is B $B W$ of $P M$ signal increases more than that of $F M$ .
$(B W)_{F M} = (1 + \frac{Δ f}{f_{m}}) (2 f_{m}) = (1 + \frac{A_{m} k_{f}}{f_{m}}) (2 f_{m})$
$(B W)_{P M} = (1 + A_{m} k_{p}) (2 f_{m})$
When only $f_{m}$ is increased, $(B W)_{P M}$ will be increased by higher factor than that of $(B W)_{F M}$

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The correct option is B BW of PM signal increases more than that of FM.(BW)FM=(1+Δffm)(2fm)=(1+Amkffm)(2fm) (BW)PM=(1+Amkp)(2fm) When only fm is increased, (BW)PM will be increased by higher factor than that of (BW)FM