Multiple Choice QuestionsWhich of the following statement is wrong ?
Ground wave propagation can be sustained at frequencies 500 kHz to 1500 kHz.
Statellite communication is useful for the frequencies above 30 MHz.
Sky wave propagation is useful in the range of 30 to 40 MHz.
Sky wave propagation takes place through tropospheric space.
C.
Sky wave propagation is useful in the range of 30 to 40 MHz.
In ground wave propagation, radiowaves travel along the surface of the earth (following the curvature of earth). Ground wave propagation can be sustained only at low frequencies (∼500 kHz to 1500 kHz) or for radiobroadcast at long wavelengths.
Satellite communication is useful for the frequencies above 30 MHz which takes place through tropospheric space. The phenomenon involved in the sky wave propagation is total internal reflection.
A signal wave of frequency 12 kHZ is modulated with a carrier wave of frequency 2.51 MHz. The upper and lower side band frequencies are respectively
2512 kHz and 2508 kHz
2522 kHz and 2488 kHz
2502 kHz and 2498 kHz
2522 kHz and 2498 kHz
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