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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 2
41.
The F.T. of {e-1 ∪(t)} is equal to . Therefore
is
ef ∪ (f)
e-f ∪ (f)
ef ∪ (-f)
e-f ∪ (-f)
Answer: Option
Explanation:

Apply duality property.

j F[g(t)] G(f)

F[G(t)] G(-f).

42.
Sound waves are electromagnetic waves.
True
False
Answer: Option
Explanation:

Sound waves are not electromagnetic in nature.

43.
In major diatonic musical scale, an octave is divided into
12 intervals
10 intervals
7 intervals
5 intervals
Answer: Option
Explanation:

A major diatomic scale has 7 intervals between one octave.

44.
The bandwidth of DSB suppressed carrier modulation system when the modulating frequency varies between 500 Hz and 5 kHz is
555 kHz
505 kHz
500 kHz
9 kHz
Answer: Option
Explanation:

fm = 5 kHz - 500 Hz 4.5 kHz

Bandwidth = 2 fm 2 x 4.5 kHz = 9 kHz.

45.
The filter circuit for feeding a wooffer has
an inductance in series and capacitance in parallel
a capacitance in series and an inductance in parallel
a resistance in series and an inductance in parallel
an inductance in series and a resistance in parallel
Answer: Option
Explanation:

Series inductance and shunt capacitance is a low pass circuit.

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