56201. In telephone, the dial tone has a frequency of
56202. Companding is used
56203. For a good public address system the sound intensity at the farthest point should be at least
56204. An ungrounded antenna near the ground
56205. Which of the following circuits cannot be demodulate SSB?
56206. Figure shows the arrangement of
56207. During day time ionosphere can be considered to be consisting of
56208. Baudot code is a six bit code.
56209. PWM can be generated
56210. Which of the following microphones has highest output impedance?
56211. Consider the following statements about PCM PCM is not noise resistantPCM requires complex encoding and quantizing circuitryPCM requires large bandwidth Which of the above are correct?
56212. In a television transmitter, the output stage is most likely to be
56213. The number of bits of information required to indicate the correct selection of 3 independent consecutive events out of 75 equally probable events is
56214. The efficiency of a direct radiating cone type loudspeaker is about
56215. At a given probability of error, binary coherent FSK is interior to binary coherent PSK by
56216. In a TV receiver the video IF amplifier provides a gain of about
56217. Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?
56218. Switching systems
56219. Which one of the following statements is wrong. The radar cross-section of a target?
56220. Which of the following cannot be used to demodulate SSB?
56221. The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.
56222. Nedumbasseri Airport is in the district of?
56223. The inductance of connecting leads can be a source of
56224. For F2 layer the critical frequency is about
56225. In the spectrum of an FM wave
56226. The reactance of bypass capacitor in a CE amplifier circuit should be
56227. In a radar system the solution to blind speed problem is to
56228. For a FM wave carrier modulating frequency is 10 kHz and bandwidth is 2 MHz. If the modulating signal amplitude is doubled, the bandwidth will be
56229. In band III of TV, distant reception (beyond line of sight range) is possible due to
56230. In amplitude modulation the rms value of radio frequency voltage after 40% modulation is 60 mV. If modulation is 80% the rms value after modulation will be about
56231. 1 GHz is equal to
56232. Consider the following statements In a pulsed radar, the transmitted pulses are of high frequencyIn a pulsed radar, the transmitted pulses are of high powerIn a pulsed radar, the transmitted pulses are of brief durationIn a pulsed radar, the transmitted pulses are of square wave shape. Of the above statements the correct statements are
56233. Probability density function of thermal noise is
56234. In a colour TV receiver AFT stands for
56235. MTSO stands for
56236. The main advantage of TDM over FDM is that it
56237. VLF waves are sometimes used because
56238. If N is the number of binary digits needed to assign individual binary code designations to the M quantization levels, the signal to quantization noise ratio S0/Nq in PCM is
56239. Which of the following is very useful as multiband HF receiving antenna?
56240. If Vs is signal voltage, Vn is noise voltage, signal to noise ratio S/N is defined as
56241. The PDF of a Gaussian random variable X is given by . The probability of the event {X = 4} is
56242. Tuned voltage amplifiers are not used
56243. If B is the bandwidth, the thermal noise voltage is proportional to
56244. ARQ stands for
56245. In FM noise can be decreased by a feature that AM does not have
56246. In case of stabilized reactance modulator AFC system
56247. Assertion (A): Demodulation of SSB and AM signals is exactly similar Reason (R): The basic SSB demodulation device is product detector.
56248. In shot noise
56249. In VCR, the chrominance signal's frequency is
56250. Assertion (A): A video monitor does not need RF tuner and IF amplifier Reason (R): The picture tube in TV is basically a CRT.