69451. A TV receiver has 20 kV EHT supply and total beam current (for 3 electron guns) of 1500 μA. The power handled by IHVT is
69452. Some possible disadvantages of high level modulation in TV transmitters are Video monitor has to supply high video voltages upto several hundred volts into highly capacitive loads drawing high current at video frequenciesThe grid modulated stage presents a varying load to its driverThe linearity and high video driving power present design problems Out of above which are true?
69453. Beam width of an antenna is expressed in
69454. In broadcast television, the number of lines per frame is chosen to be odd number to
69455. In a picture tube, the video signal is applied to
69456. If frames are repeated at 60 Hz and each frame has 525 lines, the time for scanning one horizontal line (for progressive scanning and no interlacing) is about
69457. Full duplex operation
69458. In a tape recorder the erase head is
69459. Consider the following statements as regards advantages of CCD sensors as camera pick up tube High sensitivityGood spectral responseImage lag absent Out of the above which are correct
69460. Some desirable features of a computer communication network are It should accept an intended transmission without excessive delayThe data arriving at a receiving point should be processed rapidlyWhen a transmission calls for a response, the delay of response should be minimum. Which of the above are true?
69461. Television transmission is by
69462. In the television system in India, the aspect ratio is
69463. In high power radars, which of the following are used for switching?
69464. A remote control for TV uses
69465. In the FM wave described by equation v = 15 sin (4 x 108 t + 3 sin 1100 t), the carrier frequency and signal frequency respectively are
69466. A sequence x(n) with the z transform X(z) = z4 + z2 - 2z + 2 - 3z - 4 is applied as an input to a linear, time invariant system with the impulse response h(n) = 2δ(n - 3) where The output at n = 4 is
69467. Which of the following amplifiers is used for impedance matching?
69468. Which of the following amplifiers has highest output impedance?
69469. In a superheterodyne receiver, having no RF amplifier, the IF is 455 kHz. The image frequency at 1000 kHz is
69470. Audio tapes have two tracks each 2.5 mm wide.
69471. Which of the following amplifiers has a voltage gain of less than 1?
69472. Consider the following test signal patterns RampGrillGrey shadesSine pulsePicture line up generating equipment Which of the above are used in TV studios?
69473. If aspect ratio is and number of lines in each frame is 625, the number of picture elements in one frame is
69474. Indicate the false statement: If SWR on a transmission line is infinite, the line is terminated in
69475. In TV signals colour burst is used
69476. The resonant frequency of an RF amplifier is 1 MHz and its bandwidth is 10 kHz. The Q factor will be
69477. The total number of pulses in a TV remote control is
69478. Which camera tube has highest sensitivity and very wide spectral response?
69479. Assertion (A): A Smith chart can be used for a number of calculations of a transmission lineReason (R): Smith chart is basically a polar impedance diagram.
69480. A computer monitor uses 180 W in normal operation and 20 W in sleep mode. The computer is on all the 24 hours but is in sleep mode for 18 hours a days. The energy units saved in 30 days are
69481. Consider the following functions It detects the AM video carrier IF so as to produce the video signalIt produces and separates out the inter carrier sound IF of 5.5 MHzIt amplifies the video signalIt amplifies the audio signal The video detector in a colour TV performs which of the above functions
69482. Which of the following antennas is circularly polarized?
69483. In colour TV system the colour sub carrier frequency is 4.43 MHz.
69484. A transmitter power of 5 W is increased by 20 dB. The effective radiated power is
69485. The percentage saving in power of 100% modulated suppressed carrier AM signal is
69486. The maximum distance between television transmission and receiving antennas for reasonably good reception should be
69487. Assertion (A): EM waves are attenuated as they travel outward from a sourceReason (R): Both field intensity and power density follow inverse square law.
69488. The frequency response of a microphone means
69489. Graphic equaliser system in stereophonic systems generally have
69490. 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)
69491. Some sources of TV programs are TV cameraTelecineVTRExternal signal Which of the above are actually present in a TV studio?
69492. 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
69493. In Vidicon camera tube, the resistance of photoconductive material on the target plate
69494. 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
69495. Hadfield’s operation is indicated for
69496. 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:
69497. Compact discs use
69498. 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
69499. In a communication receiver, a squelch circuit is normally inserted
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