70101. In a pulsed RADAR, the transmitter is connected to the antenna
70102. In a CD, the depth and width of each pit is
70103. Which type of modulator amplifier is used in AM transmitter?
70104. Mention the radioactive isotope which is not a pure beta Ray emitter
70105. A digital watch contains
70106. In AM increased depth of modulation increases __________ and in FM with increased depth of modulation __________ increases.
70107. In a DM system, the granular noise occurs when modulating signal
70108. Huffman code is also known as redundancy code
70109. If each frequency component of f(t) is shifted by p /2, the resulting signal is
70110. A bit synchronizer regenerates at the receiver a clock waveform which is
70111. Probability of error in DPSK is less than PSK
70112. Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectified output will be
70113. Two sine waves of amplitude A1 and A2 are multiplied. The amplitude of the spectral component is
70114. In radar display system PPI stands for
70115. In phase shift keying the input signal is
70116. The intravenous anaesthetic agent used for treating clinical depression is
70117. If Pk be the probability of the message to be received or transmitted, then the amount of information (Ik) associated, in bits, will be
70118. A circuit which cannot demodulate SSB is
70119. In TV system in India IF video and IF audio frequencies are
70120. Assertion (A): The unit of telephone traffic measurement is erlang.Reason (R): International circuits for communication are fitted with echo suppressors.
70121. The ultra short acting muscle relaxant is
70122. The primary colours are
70123. The most commonly used system of modulating for telegraphy is
70124. Which of the following antennas is not wide band?
70125. While AM has __________ frequencies, FM has __________ number of sidebands.
70126. In VHS format diameter of head drum is about
70127. The correct sequence of subsystem in an FM receiver is
70128. A wave is frequency modulated with an index of 0.1 and its frequency is multiplied by 8 times, the modulation index is
70129. Short circuited stubs are preferred to O.C stubs because
70130. When ωm is the modulation frequency in frequency modulation, the modulation index is proportional to
70131. A pre-emphasis circuit provides extra noise immunity by
70132. The ratio for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is
70133. The function of a modulator is to
70134. Which of the following radio waves are not reflected by ionosphere?
70135. Square law modulators utilise
70136. Which of the following is a disadvantage of Vestigial Sideband (VSB) system?
70137. The maximum permissible distance between two samples of a 2 kHz signal is
70138. When the video signal is applied to the picture tube in a TV receiver, the strength of video signal is about
70139. In the above case if the modulating frequency is increased to 20 kHz the bandwidth will be
70140. Assertion (A): In FM all power amplifiers can be operated in class C Reason (R): FM is a constant amplitude modulation system.
70141. In radar system which of the following is called A scope
70142. In a CD the channel separation is
70143. The unit for luminous energy is
70144. The IF bandwidth of a radar receiver is inversely proportional to
70145. If the radiated power of AM transmitter is 10 kW, the power in the carrier for modulation index of 0.6 is nearly.
70146. Satellite communication uses frequencies in the range of
70147. In a channel voice coder, the outputs of sixteen 20 Hz low pass filters are sampled, multiplexed and A/D converted. If sampling is at 40 samples/second and 3 bits/sample represents each voltage sample, the bit rate is about
70148. Super high frequency means more than 3000 MHz.
70149. Impedance inversion may be obtained with
70150. Which of the following can be used to convert PPM into PWM?
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