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Salman Ex 4-3: Modulation Depth and Sideband Frequencies

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Salman Ex 4-3: Modulation Depth and Sideband Frequencies

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Questions and Answers

What is the modulation depth of the given AM/DSB signal?

10%
20%
40%
30% (correct)

What are the Upper Sideband (USB) and Lower Sideband (LSB) frequencies of the transmitted signal?

1.002 MHz and 0.999 MHz
0.999 MHz and 1.000 MHz (correct)
1.001 MHz and 1.002 MHz
1.000 MHz and 1.001 MHz

What is the efficiency of transmission for the given AM/DSB signal?

45%
15% (correct)
25%
35%

If the total average power of the broadcast transmitter is 50 kW, what is the carrier signal power (Pc)?

20 kW (A) Signup and view all the answers

What is the maximum carrier signal amplitude if the antenna resistance is 50Ω?

50 V (D) Signup and view all the answers

What is the value of the modulation index for a sinusoidal message signal with a modulation index of 0.707?

0.707 (A) Signup and view all the answers

In amplitude modulation, what does the 'efficiency of transmission' measure?

The percentage of carrier power used in transmission (C) Signup and view all the answers

Which formula is used to calculate the efficiency of transmission in amplitude modulation?

$\eta = \frac{P_s}{P_t}$ (C) Signup and view all the answers

What is the relationship between modulation index and efficiency of transmission for maximum efficiency?

Efficiency is maximum when modulation index is 1 (C) Signup and view all the answers

Which parameter represents the 'Sideband Power' in amplitude modulation?

$P_s$ (D) Signup and view all the answers

What does the 'Carrier Power' represent in amplitude modulation?

The power contained in the main signal frequency (B) Signup and view all the answers

How is the 'Transmission Bandwidth' calculated in amplitude modulation?

$B = 2(B_m + f_m)$ (B) Signup and view all the answers

What is the minimum multiplexing bandwidth required for the given 30 signals?

94 kHz (D) Signup and view all the answers

What is the minimum transmission bandwidth required if a guard band of 0.7 kHz is allowed between each signal?

188 kHz (A) Signup and view all the answers

In an AM modulation system, if the modulating signal is a sinusoid with frequency $f_m$, what is the frequency separation between the upper and lower sidebands?

$f_m$ (C) Signup and view all the answers

Which of the following statements about the power distribution in an AM modulated signal is correct?

The sideband powers depend on the modulation index and can be greater than the carrier power. (B) Signup and view all the answers

What is the main advantage of a Tuned Radio-Frequency (TRF) receiver over a simpler receiver?

Both higher selectivity and higher sensitivity to weak signals (A) Signup and view all the answers

In the commercial AM broadcast system, what is the frequency spacing between adjacent carrier frequencies?

10 kHz (B) Signup and view all the answers