301. In colour TV system the colour sub carrier frequency is 4.43 MHz.
302. A transmitter power of 5 W is increased by 20 dB. The effective radiated power is
303. The percentage saving in power of 100% modulated suppressed carrier AM signal is
304. The maximum distance between television transmission and receiving antennas for reasonably good reception should be
305. Assertion (A): EM waves are attenuated as they travel outward from a sourceReason (R): Both field intensity and power density follow inverse square law.
306. The frequency response of a microphone means
307. Graphic equaliser system in stereophonic systems generally have
308. An amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27° C, the noise voltage at input of amplifier is (Boltzman constant k = 1.38 x 10-23 J/K)
309. Some sources of TV programs are TV cameraTelecineVTRExternal signal Which of the above are actually present in a TV studio?
310. Two sinusoidal signals of same amplitude and frequencies 10 kHz and 10.1 kHz are added together. The combined signal is given to an ideal frequency detector. The output of the detector is
311. In Vidicon camera tube, the resistance of photoconductive material on the target plate
312. In a satellite transponder the power amplifier feeds power P to the transmitting antenna of gain G. If distance of earth is d, the power flux density is
313. Which of the following are useful in comparing the noise performance of receivers? Input noise voltageNoise figureNoise resistanceNoise temperature Select answer as per the following codes:
314. Compact discs use
315. A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is
316. In a communication receiver, a squelch circuit is normally inserted
317. In PCM, the information lies
318. A 1000 kHz carrier is simultaneously modulated by 300 Hz and 2 kHz audio sine wave. Which of the following frequencies will not be present in the output?
319. SWR for a transmission line is infinity when the load is Short circuitComplex impedanceOpen circuitPure reactance Of the above statements:
320. The discone antenna is
321. The direction of pick up in a CD is
322. A (75 - j 50) Ω load is connected to a coaxial line of Z0 = 75 Ω at 10 GHz. The best method of matching consists of using
323. In PCM the amplitude levels are transmitted in a 7 unit code. Sampling frequency is 10 kHz. The bandwidth should be
324. In colour television V and U signals are
325. Which of the following has highest power gain?