69201. The rate at which information can be carried through a communication channel depends on
69202. Some types of traps used in video IF amplifier of colour TV are
69203. Direct and reflected sound waves may interfere with each other.
69204. A carrier is simultaneously modulated by two sine waves having modulation indices of 0.4 and 0.3. The total modulation index will be
69205. A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. Which of the following frequency is least likely to be present in the output?
69206. In standing wave pattern on a transmission line
69207. If the bandwidth is increased by 2, the γFM γAM (where γ is the ratio of SNR of output to SNR at input, FM is frequency modulation and AM is amplitude modulation) is increased by a factor of
69208. A carrier wave carries information.
69209. Frequency shift keying is used mostly in
69210. It is desired that transmission line and load should match for a range of frequencies. The best method is
69211. Which of the following has the highest input impedance?
69212. In a fascimile reproduction time to scan one line is 2 ms. If it has 4% blanking, the visible trace time is
69213. Consider the following statements The amplitude of an FM wave is constantFM is more immune to noise than AMFM broadcasts operate in upper VHF and UHF frequency rangesFM transmitting and receiving equipments are simpler as compared to AM transmitting and receiving equipments Which of the above are correct?
69214. Signal to noise ratio of microphone is defined as the ratio of output when the sound pressure is __________ to the output in the absence of any sound signal.
69215. A generator is feeding power to a transmission line of characteristic impedance Z0. The line is terminated in impedance ZL. Standing waves will be set up if
69216. In sound recording the degree of pre-emphasis is about 6 dB/ octave.
69217. Space wave may be a direct wave or wave reflected from earth.
69218. Radio broadcasts are generally
69219. If the frequency of a wave 20 Hz, the time period is
69220. Which of the following is taken as reference antenna for directive gain?
69221. Push pull amplifier is
69222. When the channel is noisy, producing a conditional probability of error p = 0.5; the channel capacity and entropy function would be, respectively,
69223. In CCIR-B system, the time between start of one H syn. pulse and next is
69224. Counterpoise is used in coils having
69225. For an ideal 3000 Hz channel, S/N ratio is
69226. Which of the following types of noise assumes greater importance at high frequencies?
69227. In transistor radio receivers the number of IF amplifier stages are
69228. To relay outdoor remotely located live programs, TV transmitter use
69229. If each short element of signal occupies 20 ms, the speed is
69230. It is found that in a telephone system 60 subscribers initiate calls during a 30 minute interval and the total duration of all the calls is 100 minutes. The load is
69231. E and H fields are perpendicular to each other.
69232. Consider the following: A TV receiver antenna should pick up the TV signal and develop maximum voltage from the available strength of signalIt should reject unwanted signalsIt should not suffer from co-channel interferenceIt should have a very narrowband The correct statements are
69233. If transmission bandwidth is doubled in FM, SNR is
69234. Directivity means
69235. If the oscillator output is modulated by audio frequencies upto 10 kHz, the frequency range occupied by the side bands will be
69236. The power to the portable unit of a cordless telephone is provided by
69237. In a AM wave the carrier and one of the side bands is suppressed. If m = 0.5, the percentage saving in power is
69238. Computer communication networks have
69239. Assertion (A): A balun is an RF impedance matching transformer. Reason (R): Sometimes a booster amplifier is used with a TV set.
69240. In an FM system, when the AF is 500 Hz and the AF voltage is 2.4 V, the deviation is 4.8 kHz. If the AF voltage is now increased to 7.2 V, the new deviation will be
69241. Modulation is also called detection.
69242. The maximum range of a transmitter depends on
69243. Consider the following statements about Yagi Uda antenna It is unidirectionalIts gain is about 7 dBIt is used at VLFThe optimum separation is 0.11 Which of the above are correct?
69244. In a two stage cascade amplifier, each stage has a gain of 10 dB and noise figure of 10 dB. The overall noise factor is
69245. Fields are said to be circularly polarised if their magnitudes are
69246. Three analog signals, having bandwidths 1200 Hz, 600 Hz, 600 Hz are sampled at their Nyquist rates, encoded with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is
69247. In a CD player the speed of CD is
69248. In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t1 < t < t2. This indicates that during this interval
69249. A fascimile reproduction has a specification of 200 lines per frame, progressive scanning and 5 frames per second. The time to scan one line is
69250. Consider the following features of monochrome TV Number of lines per picture 625Interlace ratio 2 : 1Aspect ratio 4 : 3Channel bandwidth 8 MHz As regards CCIR system B, which of the above are correct?
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