Q. What is the input signal level that is approximately equal to the average internally generated noise value called?

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Q. Analog signals : Signal to noise ratio:: Digital signals _________

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Q. A sensitive and selective receiver can be made using only amplifiers, selective filters, and a demodulator.

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Q. What type of receivers converts all incoming frequency into a lower frequency for better selectivity and sensitivity?

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Q. What is the output of a mixer circuit?

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Q. What is connected between the antenna and the mixer to avoid oscillator radiation?

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Q. Which of the following is not an advantage of using RF amplifiers in the initial stage of signal selection?

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Q. The LNA of a transducer has failed during the transmission of a signal. Which component’s failure has caused this?

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Q. What type of oscillators are used to input a wide range of frequencies to the IF amplifier?

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Q. Multiplexing increases the number of communication channels for transmission.

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Q. In which of the following systems multiplexing is not necessary?

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Q. Time division multiplexing: Digital signal:: Frequency division multiplexing:?

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Q. What type of multiplexing is widely used in cellphones?

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Q. The transmission of multiple signals in a common frequency without interference is called _______

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Q. For frequency division multiplexing who defines the channel bandwidth?

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Q. What is the individual carrier frequency of each signal called?

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Q. Which circuit does the actual multiplexing process in frequency division multiplexing?

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Q. Which of the following device is used to demultiplex the received signal?

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Q. The system which uses FM for the subcarriers is called _____

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Q. A cable TV service uses a single coaxial cable with a bandwidth of 860 MHz to transmit multiple TV signals to subscribers. Each TV signal is 6 MHz wide. How many channels can be carried?

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