1
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

In amplitude modulation, the amplitude of carrier wave is $A_c$ and that of the modulating signal is $A_m$. In practice, the ratio of $A_m$ to $A_c$ is kept less than or equal to one, to avoid

A
distortion
B
attenuation
C
fading
D
noise
2
MHT CET 2019 2nd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

In frequency modulated wave

A
frequency varies with time
B
both frequency and amplitude vary with time
C
amplitude varies with time
D
both frequency and amplitude are constant
3
MHT CET 2019 2nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A layer of atmosphere that reflects medium frequency radio waves which is ineffective during night, is

A
F-layer
B
E-layer
C
stratosphere
D
thermosphere
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