69651. Reception through space wave is limited to line of sight distance.
69652. A video transmission system transmits 625 picture frames per second. Each frame consist of a 400 x 400 pixel grid with 64 intensity levels per pixel. The data rate of the system is
69653. Which of the following is a false statement about Armstrong modulation system?
69654. Which one is digital modulation technique?
69655. Since noise phase modulated FM wave, as the noise sideband frequency approaches the carrier frequency, the noise amplitude
69656. Consider the following statements as regards SAW filter The centre frequency is determined by the pitch of IDT comb shaped electrodesThe response can be modified shaping the overlap of comb electrodesThe response is maximum when acoustic wave has its wavelength equal to pitchWhen a number of identical electrodes are arranged at the same pitch, the frequency characteristics of the filter is expressed by (sin x)/x Which of the above statements are correct?
69657. In telephone, the dial tone has a frequency of
69658. Companding is used
69659. For a good public address system the sound intensity at the farthest point should be at least
69660. An ungrounded antenna near the ground
69661. Which of the following circuits cannot be demodulate SSB?
69662. Figure shows the arrangement of
69663. During day time ionosphere can be considered to be consisting of
69664. Baudot code is a six bit code.
69665. PWM can be generated
69666. Which of the following microphones has highest output impedance?
69667. Consider the following statements about PCM PCM is not noise resistantPCM requires complex encoding and quantizing circuitryPCM requires large bandwidth Which of the above are correct?
69668. In a television transmitter, the output stage is most likely to be
69669. The number of bits of information required to indicate the correct selection of 3 independent consecutive events out of 75 equally probable events is
69670. The efficiency of a direct radiating cone type loudspeaker is about
69671. At a given probability of error, binary coherent FSK is interior to binary coherent PSK by
69672. In a TV receiver the video IF amplifier provides a gain of about
69673. Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?
69674. Switching systems
69675. Which one of the following statements is wrong. The radar cross-section of a target?
69676. Which of the following cannot be used to demodulate SSB?
69677. The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.
69678. The inductance of connecting leads can be a source of
69679. For F2 layer the critical frequency is about
69680. In the spectrum of an FM wave
69681. The reactance of bypass capacitor in a CE amplifier circuit should be
69682. In a radar system the solution to blind speed problem is to
69683. For a FM wave carrier modulating frequency is 10 kHz and bandwidth is 2 MHz. If the modulating signal amplitude is doubled, the bandwidth will be
69684. In band III of TV, distant reception (beyond line of sight range) is possible due to
69685. In amplitude modulation the rms value of radio frequency voltage after 40% modulation is 60 mV. If modulation is 80% the rms value after modulation will be about
69686. 1 GHz is equal to
69687. Consider the following statements In a pulsed radar, the transmitted pulses are of high frequencyIn a pulsed radar, the transmitted pulses are of high powerIn a pulsed radar, the transmitted pulses are of brief durationIn a pulsed radar, the transmitted pulses are of square wave shape. Of the above statements the correct statements are
69688. Probability density function of thermal noise is
69689. In a colour TV receiver AFT stands for
69690. MTSO stands for
69691. The main advantage of TDM over FDM is that it
69692. VLF waves are sometimes used because
69693. If N is the number of binary digits needed to assign individual binary code designations to the M quantization levels, the signal to quantization noise ratio S0/Nq in PCM is
69694. Which of the following is very useful as multiband HF receiving antenna?
69695. If Vs is signal voltage, Vn is noise voltage, signal to noise ratio S/N is defined as
69696. The PDF of a Gaussian random variable X is given by . The probability of the event {X = 4} is
69697. Tuned voltage amplifiers are not used
69698. If B is the bandwidth, the thermal noise voltage is proportional to
69699. ARQ stands for
69700. In FM noise can be decreased by a feature that AM does not have
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