69401. Which of the following microphones is the cheapest?
69402. The following are characteristic features of Port-wine stain EXCEPT
69403. If a line is terminated in characteristic impedance Z0, the input impedance measured at the input will be
69404. In a TV, the output from RF tuner is about
69405. 24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency
69406. A signal is sampled at 8 kHz and is quantized using 8 bit uniform quantizer. Assuming SNRq for a sinusoidal signal, the correct statement for PCM signal with a bit rate of R is
69407. Generally a VCR has
69408. A remote control of TV uses a 10 bit word. The maximum number of total commands it can transmit is
69409. Telecine equipment in a TV studio consists of
69410. TV signal strength when expressed in dB m has the reference of
69411. A sinusoidal voltage amplitude modulates a carrier of peak value 5 kV. Each side band has an amplitude of 500 V. The modulation index is
69412. Kell factor is about
69413. An antenna has a resistance of 50 Ω and an equivalent noise resistance of 30 Ω The noise figure in decibels is
69414. An MTI radar operating at 5 GHz has a PRF of 800 pps. The lowest blind speed is
69415. For maximum output the width of air gap of audio head should be
69416. The simplest mixer circuit for public address system uses
69417. PAM stands for
69418. In a perfect conductor the resistor noise is
69419. An RF carrier of 12 kV at 1 MHz is amplitude modulated by 1 kHz signal having peak value of 6 kV. The modulation pattern is seen on CRO screen. The voltage indicated will be
69420. In push pull amplifier, each transistor conducts for
69421. In the television system in India, each channel is allowed a bandwidth of
69422. A diode detector load consists of 0.01 μF capacitor in parallel with a 5 k ohms resistor. The maximum depth of modulation without diagonal clipping at modulating frequency of 1000 Hz and 10 kHz is
69423. A Discone antenna is
69424. In a two tone AM system the two modulating frequencies are 2000 p and 4000 p rad/sec. If carrier frequency is 2p x 106 rad/sec the frequencies of upper sidebands are
69425. For a system to be designated as hi-fi, the signal to noise ratio should be at least
69426. Dolby system of noise reduction divides the total audio spectrum into
69427. In a system an input resistance of 20 kΩ causes a noise voltage of 15μV. If two such input resistances each of 20 kΩ are used in parallel, the total noise voltage will be about
69428. In the television system in India, the odd and even fields are scanned
69429. Consider the following A signal f(t) and its Hilbert transform fh(t) have the same energy density spectrumA signal f(t) and its Hilbert transform, fh(t) have the same auto correlation functionA signal f(t) and its Hilbert transform are mutually orthogonal Which of the above are true?
69430. Vidicon and plumbicon operate on the principle of
69431. A TV receiver has a width of 60 cm. The aspect ratio is 4/3. The required EHT supply is about
69432. The typical squelch circuit
69433. A narrow band noise n(t) has symmetrical spectrum and has power density spectrum 0.2 x 10-6. The power density of quadrature component is
69434. The radio receivers mostly used now a days are
69435. The reactance of coupling capacitors, for DC quantities, is
69436. An AM wave is given by s(t)AM = 20 (1 + 0.5 cos 103t + 0.3 cos 104 t cos 106 t) the modulation index of the envelope is
69437. The modulating frequency in frequency modulation is increased from 10 kHz to 30 kHz. The bandwidth is increased by
69438. A sinusoidal signal with peak to peak amplitude of 1.536 volt is quantized into 128 levels using a mid-rise uniform quantizer. The quantization noise power is
69439. An FM wave is made to pass through a frequency tripler. If original modulation index is mf, the output of tripler has a modulation index equal to
69440. A balun provides an impedance transformation of
69441. A signal m(t) with bandwidth 500 Hz is first multiplied by a signal g(t) where . The resulting signal is then passes through an ideal low pass filter with bandwidth 1 kHz the output of the low pass filter would be
69442. If γ = (S0/N0)/(Si/Nm) where S0 and S1 are signal power output and signal power input and N0 and Nm are noise power output and noise power input, the value of γ for SSB-SC and DSB-SC amplitude modulated system respectively are
69443. Consider the draw backs Slope overloadSerration noiseGranular noise Which of these draw backs does Delta modulation have?
69444. It is required to increase the maximum range of a radar by a factor of two. The peak power transmitted in the radar system has to be increased by a factor of
69445. Armstrong F.M. transmitter performs frequency multiplication in stages
69446. A source generates three symbols with probabilities 0.25, 0.25, 0.50 at a rate of 3000 symbols per second. Assuming independent generation of symbols, the most efficient source encoder would have average bit rate is as
69447. The filter circuit for feeding tweeter has
69448. The name modem is a contraction of terms modulator demodulator.
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