18 Questions
What is the modulation depth of the given AM/DSB signal?
30%
What are the Upper Sideband (USB) and Lower Sideband (LSB) frequencies of the transmitted signal?
0.999 MHz and 1.000 MHz
What is the efficiency of transmission for the given AM/DSB signal?
15%
If the total average power of the broadcast transmitter is 50 kW, what is the carrier signal power (Pc)?
20 kW
What is the maximum carrier signal amplitude if the antenna resistance is 50Ω?
50 V
What is the value of the modulation index for a sinusoidal message signal with a modulation index of 0.707?
0.707
In amplitude modulation, what does the 'efficiency of transmission' measure?
The percentage of carrier power used in transmission
Which formula is used to calculate the efficiency of transmission in amplitude modulation?
$\eta = \frac{P_s}{P_t}$
What is the relationship between modulation index and efficiency of transmission for maximum efficiency?
Efficiency is maximum when modulation index is 1
Which parameter represents the 'Sideband Power' in amplitude modulation?
$P_s$
What does the 'Carrier Power' represent in amplitude modulation?
The power contained in the main signal frequency
How is the 'Transmission Bandwidth' calculated in amplitude modulation?
$B = 2(B_m + f_m)$
What is the minimum multiplexing bandwidth required for the given 30 signals?
94 kHz
What is the minimum transmission bandwidth required if a guard band of 0.7 kHz is allowed between each signal?
188 kHz
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?
$f_m$
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.
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
In the commercial AM broadcast system, what is the frequency spacing between adjacent carrier frequencies?
10 kHz
This quiz covers the calculation of modulation depth, upper and lower sideband frequencies, amplitude of sideband frequencies, and efficiency of transmission for an AM/DSB single tone-modulating signal. Learn how to solve these calculations using given values for modulation index, carrier and modulation frequencies, and amplitudes.
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