JEE PYQ: Communication System Question 14
Question 14 - 2021 (25 Feb 2021 Shift 1)
Given below are two statements:
Statement I: A speech signal of 2kHz is used to modulate a carrier signal of 1MHz. The bandwidth requirement for the signal is 4kHz.
Statement II: The side band frequencies are 1002kHz and 998kHz.
(1) Both statement I and statement II are false
(2) Statement I is false but statement II is true
(3) Statement I is true but statement II is false
(4) Both statement I and statement II are true
Show Answer
Answer: (4)
Solution
Bandwidth $= 2f_m = 4$ kHz. Side bands $= 1000 \pm 2 = 998$ and $1002$ kHz. Both true.
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