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