The following are some statement about AM (amplitude modulation) and F

1.	The following are some statement about AM (amplitude modulation) and FM (frequency modulation): (A) The circuitry for AM is more complex than that for FM. (B) The bandwidth of the signals, during AM, is twice the frequency of the message signal. (C) The bandwidth of the signals, during FM, is much more than twice the frequency of the message signals. (D) During frequency modulation, the frequency of the carrier wave varies in accordance with the frequency of the message signals. The correct statement’s, from the above, is / are the statement / s. (1) (A) and (C) (2) (B) only (3) (D) only (4) (B) and (C)
Answer» Correct option: (4) (B) and (C) Explanation: Statement (A) is incorrect; it is the other way round. Statement (D) is incorrect; during FM, the frequency of the carrier wave varies in accordance with the ‘amplitude’ of the message signal. Statement (B) and (C) are both correct. During AM, the side band frequency being (ω_c – ω_m) and (ω_c +ω_m), the bandwidth of the signal is 2ω_m. During FM, the bandwidth of the signal is much higher than 2ω.

The following are some statement about AM (amplitude modulation) and FM (frequency modulation): (A) The circuitry for AM is more complex than that for FM. (B) The bandwidth of the signals, during AM, is twice the frequency of the message signal. (C) The bandwidth of the signals, during FM, is much more than twice the frequency of the message signals. (D) During frequency modulation, the frequency of the carrier wave varies in accordance with the frequency of the message signals. The correct statement’s, from the above, is / are the statement / s. (1) (A) and (C) (2) (B) only (3) (D) only (4) (B) and (C)

Answer»

Correct option: (4) (B) and (C)

Explanation:

Statement (A) is incorrect; it is the other way round.

Statement (D) is incorrect; during FM, the frequency of the carrier wave varies in accordance with the ‘amplitude’ of the message signal.

Statement (B) and (C) are both correct. During AM, the side band frequency being (ω_c – ω_m) and (ω_c +ω_m), the bandwidth of the signal is 2ω_m.

During FM, the bandwidth of the signal is much higher than 2ω.