Electronics and Communication Engineering - Communication Systems

16.
In FM, the frequency deviation is
always constant
directly proportional to modulating frequency
inversely proportional to modulating frequency
proportional to amplitude of modulating signal
Answer: Option
Explanation:
No answer description is available. Let's discuss.

17.
If fh(t) is the Hilbert transform of f(t), and f(t) is a real valued signal, the pre-envelope of f(t) is
f(t) - jfh(t)
f(t) + jfh(t)
fh(t) + jf(t)
fh(t) - jf(t)
Answer: Option
Explanation:
No answer description is available. Let's discuss.

18.
Speech amplifiers are usually operated as
class A
classes AB
class B
class C
Answer: Option
Explanation:
No answer description is available. Let's discuss.

19.
In which frequency range is the noise figure in a transistor independent of frequency
intermediate frequencies
high frequency
low frequencies
both low and high frequencies
Answer: Option
Explanation:
No answer description is available. Let's discuss.

20.
Which of the following is likely to be associated with FM radio broadcasting?
90 Hz
90 kHz
900 kHz
90 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.