1) Example of continuous wave analog modulation is a. PCM b. DM c. AM d. PAM
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2) The standard value for Intermediate frequency (IF) in AM receivers is a. 455 KHz b. 580 KHz c. 10.7 MHz d. 50 MHz
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3) The functions of radio receiver are a. Receive the Incoming modulated carrier by antenna b. Select the wanted signal and reject the unwanted signals and noise c. Detection and amplification of the information signal from the carrier d. All of the above
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4) Function of frequency mixer in super heterodyne receiver is a. Amplification b. Filtering c. Multiplication of incoming signal and the locally generated carrier d. None of the above
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5) The advantages of using an RF amplifier are a. Better sensitivity b. Improved signal to noise ratio c. Better selectivity d. All of the above
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6) The costas receiver is used for a. FM signal b. DSB-SC signal c. PCM signal d. DM signal
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7) Cross talk is - a. The disturbance caused in the nearby channel or circuit due to transmitted signal b. Adjacent frequency rejection c. Generation of closely lying side bands d. None of the above
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8) In Frequency Modulation - a. Amplitude of the carrier remains same b. Frequency of the carrier varies in accordance with the modulating signal c. The number of side bands are infinite d. All of the above
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9) Frequency deviation in FM is a. Change in carrier frequency to the frequency above and below the centre frequency b. Formation of side bands c. The variation of the instantaneous carrier frequency in proportion to the modulating signal d. All of the above
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10) Carrier swing is defined as a. The total variation in frequency from the lowest to the highest point b. Frequency deviation above or below the carrier frequency c. Width of the side band d. None of the above
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11) The amount of frequency deviation in FM signal depends on a. Amplitude of the modulating signal b. Carrier frequency c. Modulating frequency d. Transmitter amplifier
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12) Drawbacks of using direct method for generation of FM signal are a. Does not give high stability to FM signal frequency b. Distorted FM signal is generated due to harmonics of modulating signal c. Cannot be used for high power FM generation d. Both a and b
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13) Advantage of using direct method for generation of FM signal is a. It gives high stability to FM signal frequency b. Distortion free FM signal is generated c. High power FM generation is possible d. None of the above
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14) What are the disadvantages of using balanced slope detector for demodulation of FM signal? a. The detector operates only for small deviation in frequency b. Low pass filter of the detector produces distortion in the detection c. Both a and b d. None of the above
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15) Drawbacks of Tuned Radio Receiver are a. Oscillate at higher frequencies b. Selectivity is poor c. Bandwidth of the TRF receiver varies with incoming frequency d. All of the above
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16) Sensitivity is defined as a. Ability of receiver to amplify weak signals b. Ability to reject unwanted signals c. Ability to convert incoming signal into Image Frequency d. Ability to reject noise
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17) In radio receivers, varactor diodes are used for a. Tuning b. Demodulation c. Mixing d. None of the above
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18) The standard value for Intermediate frequency (IF) in double conversion FM receivers is a. 455 KHz b. 580 KHz c. 10.7 MHz d. 50 MHz
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19) Amplitude limiter in FM receivers are used to a. Remove amplitude variations due to noise b. Filteration c. Demodulation d. Amplification
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20) Pre emphasis is done a. For boosting of modulating signal voltage b. For modulating signals at higher frequencies c. In FM before modulation d. All of the above
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