69351. In the FM wave described by equation v = 15 sin (4 x 108 t + 3 sin 1100 t), the maximum frequency deviation is
69352. The radar cross-section of a target depends an
69353. A directional microphone gives an output of 0.5 mV whereas an omnidirectional one gives an output of 0.5 μV in the same position for the same sound pressure. The directivity of the directional microphone is
69354. If Eb, the energy per bit of a binary digital signal is 10-6 watt sec. and the one sided power spectral density of the white noise N0 = 10-5 W/Hz, then the output SNR of the matched filter is
69355. Consider the following statements about Rhombic antenna It is non resonantIt is a broad band antennaIt is ideally suited for HF transmission Which of the above are correct?
69356. Assertion (A): A composite video signal has synchronising pulses.Reason (R): It is necessary to synchronise the scanning process in the transmitter and receiver.
69357. Noise with uniform power spectral density of N0ω/Hz is passed through a filter H(ω) = 2 exp (-J ω ty) followed by an ideal low pass filter of bandwidth B Hz. The output noise power in watts is
69358. Assertion (A): In standing wave pattern, the nodes and anti nodes are separated by half wave-lengthReason (R): When line is terminated in resistance RL, the standing wave ratio is SWR = Z0/RL or RL/Z0
69359. An amplifier has an input resistance of 10 kΩ and the noise voltage is 10 μV. If two such resistances of 10 kΩ each are connected in series at the input, the total noise voltage is about
69360. Drugs used for treatment of leprosy are
69361. In a colour TV receiver the bandwidth of RF amplifier is
69362. An FM signal with a deviation is passes through the mixer, and has its frequency reduced five fold. The deviation in the output of the mixer is
69363. FSK is a system involving
69364. A 200 Hz sound wave is to be transmitted by a 1000 kHz radio wave using frequency modulation. The instantaneous frequency variation will be
69365. In a TV studios, flying spot scanner is a device for
69366. A broadcast radio transmitter radiates 5 kW when the modulation percentage is 60. How much of this is carrier power?
69367. A device has two resistances 300 Ω and 200 Ω respectively. The noise voltages due to these two resistance calculated separately are 5.38 μV and 4.38 μV respectively. When both of them are used together, the noise voltage will be
69368. The antenna diameter of a radar system is doubled. The maximum range will
69369. Which of the following microphones works on the piezoelectric effect?
69370. In PAL system weighting of R - Y and B - Y signals is done to
69371. In case of probability of the message is 1 to 16 then the information will be
69372. The saving of power in DSB-SC modulated at 80% is
69373. A total of 16 equally probable events exist. If it is required to select one out of them, the number of required bits is
69374. When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power
69375. Quantizing error occurs in
69376. In audio cassettes the width of each recording track is
69377. The most commonly used transistor amplifier circuit is
69378. When energy is fed into open wire transmission line the energy may get dissipated due to
69379. Fourier series expansion of a real periodic signal with fundamental frequency is given by It is given that c3 = 3 + j5. then c-3 is
69380. Loudness control gives
69381. A mobile telephone has a range of about
69382. If transmitted power is 75 kW, the field strength at 30 km distance will be about
69383. In the television system in India, each frame is scanned
69384. Each kilometer of travel in electromagnetic radiation means a time delay of
69385. A video monitor is exactly similar to TV receiver.
69386. A RADAR can be used to
69387. In single tone AM modulation, the transmission efficiency for m = 1 is
69388. AM amplifier having noise figure of 20 dB and available power gain of 15 dB is followed by a mixer circuit having noise figure of 9 dB. The overall noise figure as referred to input in dB is
69389. Which one of the following is non-resonant antenna?
69390. Condyloma lata is seen in
69391. The efficiency of using a binary system for selection of 1 out of 13 equally probable events is
69392. The most suitable method for detecting a modulated signal g(t) = (3 to 6 cos 2p fmt) cos 2p fct is
69393. The time required for horizontal blanking is 16% of that for each horizontal line. If horizontal time is 63.5 μs, the horizontal blanking time for each line is about
69394. When the number of quantising levels is 16 in PCM, the number of pulses in a code group will be
69395. A message signal with bandwidth 10 kHz is lower sideband SSB modulated with carrier frequency fc1 = 106 Hz. The resulting signal is then passed though a narrow band frequency modulator with carrier frequency fc2 = 109 Hz. The bandwidth of the output would be
69396. In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor.
69397. For 10 bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will
69398. The video heads, in VCR, feed the other circuit
69399. A high pulse repetition frequency in a radar
69400. In PCM, the biggest disadvantage as compared to AM is
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