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Important Questions on Space Communication

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Physics>Modern Physics>Space Communication>Amplitude Modulation

A diode detector is used to detect an amplitude modulated wave of 60% modulation  by using a condenser of capacity 250 pico farad in parallel with a load resistance of 100 kilo ohm. Find the maximum modulated frequency which could be detected by it.

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Physics>Modern Physics>Space Communication>Amplitude Modulation
A signal of frequency 3kHz is amplitude modulated on a carrier wave of frequency 2.5 MHz. The upper and lower sideband frequencies in the resultant signal are
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Physics>Modern Physics>Space Communication>Amplitude Modulation
If the maximum and minimum values of an amplitude modulated signals are respectively 5.9 V and 1.2 V, the modulation index of the signal is
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Physics>Modern Physics>Space Communication>Amplitude Modulation
The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot?
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Physics>Modern Physics>Space Communication>Amplitude Modulation

A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal is/are:

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Physics>Modern Physics>Space Communication>Amplitude Modulation
If the maximum and the minimum amplitudes of an amplitude modulated wave are 25 V and 5 V respectively, then the modulation index is
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Physics>Modern Physics>Space Communication>Amplitude Modulation
A carrier wave of peak voltage 20 V is used to transmit a message signal. For getting a modulation index of 60%, the peak voltage of the modulating signal is
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Physics>Modern Physics>Space Communication>Amplitude Modulation
A message signal of frequency 10 kHz and peak value of 10 volts is used to moderate a carrier of frequency 1 MHz and peak voltage 20 volts. The modulation index and side bands produced are
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Physics>Modern Physics>Space Communication>Amplitude Modulation
A message signal of frequency 100 MHz and peak voltage 100 V is used to execute amplitude modulation on a carrier wave of frequency 300 GHz and peak voltage  400 V . The modulation index and difference between the two side band frequencies are:
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Physics>Modern Physics>Space Communication>Amplitude Modulation
A carrier signal of frequency v1 and peak voltage of V1 is modulated by a message signal of frequency v2 and peak voltage of V2. Let m be the modulation index and v+,v- be side bands produced. The correct statement is
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Physics>Modern Physics>Space Communication>Amplitude Modulation
A signal of frequency 20kHz and peak voltage 10 V is used in the amplitude modulation of a carrier wave of frequency 0.5MHz and peak voltage 20 V. Then the ratio of the frequencies of upper side band to the lower side band is
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Physics>Modern Physics>Space Communication>Amplitude Modulation
Choose the correct statement:
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Physics>Modern Physics>Space Communication>Amplitude Modulation
Identify the correct statement among the following.
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Physics>Modern Physics>Space Communication>Amplitude Modulation
In amplitude modulation, the sinusoidal carrier frequency used is denoted by ωc and the signal frequency is denoted by ωm . The bandwidth Δωm of the signal is such that Δωm≪ωc. Which of the following frequencies is not contained in the modulated wave?
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Physics>Modern Physics>Space Communication>Amplitude Modulation
For an amplitude modulated wave, the maximum amplitude is found to be 12 V while the minimum amplitude is found to be 4 V. The modulation index μ will be
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Physics>Modern Physics>Space Communication>Amplitude Modulation
In amplitude modulation
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Physics>Modern Physics>Space Communication>Amplitude Modulation
If a message signal of frequency fm is amplitude modulated with a carrier signal of frequency fc and radiated through an antenna, the wavelength of the corresponding signal in air is
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Physics>Modern Physics>Space Communication>Amplitude Modulation
A message signal 15 sin 100πt is used to modulate a carrier signal 45 sin 3×106πt. The modulation index is
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Physics>Modern Physics>Space Communication>Amplitude Modulation
In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 2 V, if the base resistance is 1 kΩ and the current amplification of the transistor is 100 then the input signal voltage is
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Physics>Modern Physics>Space Communication>Amplitude Modulation
A signal of frequency 20 kHz and peak voltage of 5 Volt is used to modulate a carrier wave of frequency 1.2 MHz and peak voltage 25 Volts. Choose the correct statement.