69251. In the absence of noise, if C is channel capacity in bits/s, δf is channel bandwidth in Hz and N is number of coding levels. Then
69252. The open loop gain of an amplifier is 50 but is likely to change by 20%. If negative feedback with β = 0.1 is used, the change in gain will be about
69253. Audio amplifiers need
69254. Meig’s syndrom is associated with
69255. In a TV, studio the function of vision switcher is to
69256. In the equation of M-ary PSK signal (where Ey is symbol energy), M becomes large. Then d will approach
69257. The trapezoidal pattern of figure is obtained when examining an AM wave by an oscilloscope. Modulation factor of the wave is
69258. Y signal has maximum percentage of
69259. To ensure good transient response in audio systems the natural frequencies should be
69260. If k is dielectric constant of a medium, the velocity factor in that medium is
69261. An AM signal and a narrowband FM signal with identical carriers, modulating signals and modulation index of 0.1 are added together. The resultant signal can be closely approximated by
69262. The equation v(t) = A cos [ωct + φ(t)] where A and ωc are constant and φ(t) is a function of base signal represents Phase modulationAmplitude modulationAngle modulationFrequency modulation Which of the above are true?
69263. An FM signal with deviation δ is passed through mixer. Its frequency is reduced five fold. The deviation in output of mixer is
69264. The total number of channels allotted for cellular telephone is
69265. The F.T. of {e-1 ∪(t)} is equal to . Therefore is
69266. Sound waves are electromagnetic waves.
69267. In major diatonic musical scale, an octave is divided into
69268. The bandwidth of DSB suppressed carrier modulation system when the modulating frequency varies between 500 Hz and 5 kHz is
69269. The filter circuit for feeding a wooffer has
69270. The Hilbert transform of cos ω1t + sin ω2t is
69271. In ionosphere incidence angle is 60°. The maximum usable frequency fm is equal to
69272. The generally used value of EHV supply in TV receivers is
69273. The number of channels available in MF band (300 kHz - 3 MHz) for AM modulating signal of 20 kHz is
69274. The function of blend control in stereo system is
69275. The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is
69276. In a reactance FET, gm = 9 x 10-3 Siemens, gate to source resistance is one-ninth of reactance of gate to drain capacitor and frequency is 4 MHz. The capacitive-reactance is
69277. Audio cassettes used in household tape recorders have a width of
69278. The receiver of a pulsed RADAR can detect signal power in the order of
69279. In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is
69280. Which camera tube has highest dark current?
69281. If a sound wave has a frequency of 50 Hz, the wavelength is
69282. Skin depth at 1000 MHz in comparison with that at 500 MHz is
69283. Consider the following Generation of SSB signalsDesign of minimum phase type filtersRepresentation of band pass signals Which of the above applications is Hilbert transform used?
69284. The dc voltage on plate modulated class C amplifier is 8 kV. If the peak modulating voltage is 4 kV, the peak RF voltage delivered to load is
69285. In telephone systems the relation between load r , number of calls initiated during a specified interval λ and average duration of a call (h) is
69286. In a Vidicon camera tube
69287. In a CD the sampling frequency is nearly
69288. Consider the following statements about loop antenna It is suitable for direction finding applicationIt is a single turn or multiturn coil carrying RF currentThe loop is surrounded by a magnetic field everywhere perpendicular to the loop Which of the above statements are correct?
69289. Which of the following is present in both TRF receiver and superheterodyne receiver?
69290. The number of channels in a stereophonic system is
69291. When the carrier is unmodulated, a certain transmitter radiates 9 kW when the carrier is sinusoidally modulated the transmitter radiates 10.125 kW. The modulation index will be
69292. A signal x(t) = 100 cos (24p x 103t) is ideally sampled with a sampling period of 50 μ sec and then passed through an ideal low pass filter with cut off frequency of 15 kHz Which of the following frequencies are present at the filter output?
69293. A sinusoidal voltage of 2 kV peak value is amplitude modulated to give 20% modulation. The peak value of each side band term is
69294. Consider the following reasons for using antenna coupler To prevent illegal radiation of spurious frequenciesTo tune out reactive components of antenna impedanceTo have correct value of load impedance for transmitter. Which of the above are correct?
69295. Which of the following is true in a tape recorder?
69296. In a high speed modem the data rate handled is about
69297. Trinitron is a monochrome picture tube.
69298. The first pulse in a TV remote control is
69299. If the ratio of ac to dc load impedance of a diode detector is low, the result will be
69300. The minimum step size required for a Delta modulator operating at 36 samples/sec to track the signal (here u(t) is the unit step function) x(t) = 125t (u(t) - u(t - 1)) + (250 - 125t) (u(t - 1) - u(t - 2)) So that slope overload is avoided, would be
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