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You Are On Multi Choice Question Bank SET 1122

56101. An S/N ratio of 3 expressed in db is





56102. The material used for the magnet of moving coil cone type loudspeaker is





56103. CCIR system B employs





56104. The power to the base unit of a cordless telephone is supplied by





56105. If velocity of sound waves in air at 0°C is 330 m/s, the velocity at 40°C is about





56106. A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is





56107. In FM, as bandwidth increases





56108. A 400 W carrier is amplitude modulated with m = 0.75. If single side band suppressed carrier is used the total power in modulated wave is





56109. In TV transmitter, the function of duplexer is





56110. Microwave link repeaters are typically 50 km apart in TV transmission due to




56111. Assertion (A): The colour signal consists of only luminance signalReason (R): In India PAL colour signal system is used.





56112. To separate channels in FDM receiver we have to use





56113. A device with input x(t) and y(t) is characterized by y(t) = x2(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is





56114. Assertion (A): Bandwidth of a TV signal is 5 MHz.Reason (R): TV systems use vestigial side band transmission.





56115. If sound intensity is 8 W/m2, the dB level of this sound is about





56116. The distance of a direct broadcasting satellite from earth's surface is about





56117. Which of the following microphones has an inbuilt amplifier?





56118. UHF range is





56119. In asynchronous TDM, for n signal sources, each frame contains m slots, where m is usually





56120. How much is contributed by each bit in the code word of a PCM system under uniform and symmetric quantization to the signal to noise ratio?





56121. Noise which assumes great importance at high frequencies is





56122. Which one is Analog Continuous modulation technique?





56123. AM transmitter employing low level modulation





56124. As the area of a public meeting increases the amplifier power output required increases.



56125. The number of spectral component when two cosine waves are multiplied of different frequency





56126. Radiation resistance of an antenna is a





56127. A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 μ sec. Which of the following frequencies will not be in the modulated signal?





56128. The input to a coherent detector is DSB - SC signal plus noise. The noise at the detector output is





56129. All of the output pulses are at full transmitter power for a strong signal in all of the following except





56130. A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is





56131. The spectrum of the white noise and an impulse function is similar in following aspects





56132. In a telephone system, the grade of service means





56133. A longwave AM broadcast transmitter needs





56134. AGC voltage is applied to the stages which are





56135. LCD uses





56136. Which of the following stage is not present in AM receiver as compared to FM receiver?





56137. The function of duplexer in a RADAR is





56138. If e = 10 cos (2p x 108t + 20 cos 2p 103t). The bandwidth is





56139. In FM, as the modulating frequency decreases and the modulating voltage amplitude





56140. Modulation system used for video-modulation in television broadcast is





56141. The highest modulation frequencies typically used in FM broadcast is





56142. The intermediate frequency of a superheterodyne receiver is 450 kHz. If it is tuned to 1200 kHz, the image frequency will be





56143. In the above case the modulation index will be





56144. Which of the following statement regarding single-sideband (SSB) transmission is not correct?





56145. For demodulating PCM; it is first converted into





56146. One of the advantages of base modulation over collector modulation in a class C transistor amplifier is





56147. In an AM transmitter after the modulation stage, class C amplifier




56148. The maximum number of AM broadcast stations that can be accommodated in a 100 kHz bandwidth for the highest modulating frequency of 5 kHz will be





56149. For a short dipole having an effective length less than half the wavelength the radiation resistance is





56150. In a low level amplitude modulated system, the amplifier modulated stage must be





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