69301. An FM signal with a deviation δ is passed through a mixer, and has its frequency reduced 5 fold. The deviation in the output of the mixer is
69302. In PCM, if the number of quantization levels is increased from 4 to 64, then the bandwidth requirement will approximately be increased __________ times.
69303. A tweeter should be fed from the input through a
69304. The modulation index is, if fm = 500 Hz, Δf = 2.25 kHz
69305. If D is mouth diameter of a paraboloid reflector, its directivity is proportional to
69306. A noiseless 3 kHz channel can't transmit binary bit at the rate
69307. In an AM wave the carrier and one of the side bands is suppressed. If m = 1, the percentage saving in power is
69308. Assertion (A): An electronic tuner uses varactor diodeReason (R): The capacitance of a varactor diode depends on the magnitude of reverse bias.
69309. A superheterodyne receiver is to operate in the frequency range 550 kHz - 1650 kHz, with the intermediate frequency of 450 kHz. Let denote the required capacitance ratio of the local oscillator and I denote the image frequency (in kHz) of the incoming signal. If the receiver is tuned to 700 kHz, then
69310. In a tape recorder the output from RF oscillator is given to
69311. A + 1.9 lens has a focal length of 25 mm. The diameter of lens is about
69312. Which of the following terms are applicable to troposcatter propagation?
69313. If the amplitude of the voltage is kept constant, but its frequency is raised to 6 kHz, the new deviation will be for the modulation index is, if fm = 500 Hz, Δf = 2.25
69314. In TV scanning sequence of lines is
69315. Which of the following microphones works on the principle of Faraday's law?
69316. In a CE amplifier connection, the emitter is at ground potential for
69317. Directive gain is
69318. Which of the following sampling frequencies is considered adequate in voice telephony?
69319. In equally tampered scale, frequency of each tone equals the frequency of lower adjacent tone multiplied by
69320. A carrier is modulated by two modulating waves A and B having modulation indices of 0.6 and 0.8 respectively. The overall modulation index is
69321. A communication channel disturbed by additive white, Gaussian noise has a bandwidth of 4 kHz and SNR of 15. The highest transmission rate that this channel can support (in k bits/sec) is
69322. Which of the following microphones is used as a standard for calibration?
69323. The reactance of coupling capacitor for AC signals in an amplifier, should be
69324. 24 telephone channels, each band limited to 3.4 kHz are to be time division multiplexed using PCM. If sampling frequency is 10 kHz and number of quantization levels is 128, the required bandwidth of PCM is
69325. Resonant circuits are used in
69326. Auspitz sign is seen in
69327. Linear diode detector utilizes
69328. In the equivalent circuit of a moving coil cone type loudspeaker, the mass of the moving system is represented by
69329. Assertion (A): In India we use CCIR-B standardReason (R): Video signals are frequency modulated.
69330. CATV stands for
69331. Household tape recorders use
69332. A 400 W carrier is modulated to a depth of 75 percent. The total power in modulated wave will be
69333. A geostationary satellite
69334. A line has L = 0.8 µH/m and C = 32 pF/m. Z0 =
69335. A line has standing waves with a voltage maximum of 35 mV and minimum of 17.5 mV VSWR is
69336. For a bit rate of 8 kbps, the best possible values of the transmitted frequencies in a coherent binary FSK system are
69337. If luminance signal Y = 0.3 R + 0.59 G + 0.11 B, the hue of R - Y colour is
69338. Trap circuits used in video IF amplifier of colour TV are
69339. Sign of groove is seen in
69340. A 300 Hz sound wave of intensity 20 dB is transmitted by a 1500 kHz radio wave by frequency modulation. It is seen that instantaneous frequency varies between 1500.2 kHz and 1499.8 kHz, 300 times a second. If the intensity of sound wave is 100 dB.
69341. If the average power of radar transmitters is 2 kW and the peak power of the transmitter is 1000 kW, what will be the duty cycle?
69342. An analog signal is band limited to B Hz sampled at Nyquist rate and samples are quantized into 4 levels each with probability . The information rate is
69343. The HV supply to a TV receiver is 25 kV and the total beam current for the three electron guns is 2000 μA. The power handled by IHVT is
69344. Some advantages of optical fibre cables are small diameterImmunity to cross talk and EM interferenceLaser and LED modulation methods lend themselves ideally to digital operation Which of the above are correct?
69345. The contrast control in colour TV receiver is done by
69346. The requirements of carrier frequency are
69347. If N bits are lumped together to get an N-bit symbol, the possible number of symbols is
69348. The received signal frequency at any time of a super-heterodyne receiver having IF = 456 kHz is 1 MHz. The corresponding image signal is
69349. For an ideal 3000 Hz channel, Nyquist rate is
69350. Assertion (A): Electromagnetic waves in free space spread uniformly in all directions from a point sourceReason (R): Free space has no interference or obstacles.
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