Q. FM is called constant envelope because ______ of carrier wave is kept constant.

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Q. Which of the following are two most important classes of angle modulation?

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Q. Frequency modulated signal is regarded as the phase modulated signal in which the modulating wave is differentiated before modulation.

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Q. Frequency modulation index defines the relationship between the ______ and bandwidth of transmitted signal.

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Q. FM bandwidth is approximated using _______ rule.

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Q. Which of the following are two methods for generating FM signal?

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Q. In indirect method, the carrier frequency is directly varied in accordance with the input modulating signal.

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Q. Which of the following is used to vary the frequency of the carrier frequency in accordance with the baseband signal amplitude variations in direct method of FM generation?

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Q. Frequency demodulator is a frequency to amplitude converter circuit.

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Q. Which of the following is not a technique for FM demodulation?

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Q. Which of the following FM demodulator is sometimes known as pulse averaging discriminator?

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Q. PLL in FM detection stands for ______

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Q. In angle modulation, signal to noise ratio before detection is a function of ______

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Q. FM can improve the receiver performance through adjustment of transmitted power.

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Q. Modern mobile communication systems use analog modulation techniques.

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Q. Which of the following is not an advantage of digital modulation?

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Q. A desirable modulation scheme provides _________ bit error rates at __________ received signal to noise ratios.

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Q. The performance of modulation scheme is not measured in terms of __________

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Q. In digital communication system, in order to increase noise immunity, it is necessary to increase _________

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Q. Which of the following is the ratio of signal energy per bit to noise power spectral density?

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