69901. For an RC low pass filter, the relation between noise bandwidth BN and 3-dB bandwidth B3dB is
69902. In FM and AM the ratio of signal to noise ratio at the detector output least depends upon
69903. Which of the following can provide two or more voice circuits with the same carrier?
69904. A linear diode detector uses RC filter. As modulation index increases the maximum permissible value of time constant RC
69905. In SSB generation, the most commonly used filter is
69906. The FM broadcast band is from
69907. If k is Boltzmann's constant, T0 is standard ambient temperature, δf is bandwidth of receiver, F is noise figure, the minimum receivable signal in a radar receiver is given by
69908. The purpose of source coding is to
69909. If a source of information generates messages at the rate of r messages per second and H is entropy, the information rate is
69910. The noise generated by a resistor depends upon
69911. A source has two symbols x1 and x2 with probabilities pi and pr. If a new source with four symbols is generated from the above source, the new symbol probabilities will be (∈ is a number such that 0 < ∈ < 1)
69912. Coupling and bypass filters can be a source of
69913. Assertion (A): SSB transmitter is generally smaller than AM transmitter Reason (R): SSB systems mostly use combined transmitter receiver.
69914. The VLF, LF and MF antennas are
69915. The block diagram of AM transmitter in which high level modulation is used as shown in figure. The block X could be
69916. In FM 'guard band' is provided
69917. Assertion (A): FM requires more bandwidth than AMReason (R): Wide band FM is used for broadcast transmissions.
69918. When E1, E2, E3 etc. are the simultaneous modulating voltages, then the total modulating voltage Et will be
69919. A frequency doubler has an FM signal input at 13 MHz with a deviation of 5 kHz. The output, frequency for the carrier will be
69920. In MF range, increasing the transmitter power
69921. The most frequent users of long distance VLF transmission is
69922. BFO stands for
69923. SSB-SC stands for
69924. A lens has a hyperfocal distance of 7.5 m. It is focused at 7.5 m. Then
69925. In a 4-ary FSK, the frequencies are separated by fs. Then they are
69926. In cell communication, cell stands for
69927. In which of the following frequency bands are the standard AM radio broadcast stations?
69928. The frequency tolerance for the RF carrier in the standard AM radio broadcast band is
69929. If carrier is modulated by a digital bit stream having one of the possible phases of 0°, 90°, 180°, and 270°, then modulation is called
69930. In FM, the frequency deviation is
69931. If fh(t) is the Hilbert transform of f(t), and f(t) is a real valued signal, the pre-envelope of f(t) is
69932. Speech amplifiers are usually operated as
69933. In which frequency range is the noise figure in a transistor independent of frequency
69934. Which of the following is likely to be associated with FM radio broadcasting?
69935. If D is diagonal and F is focal length, lens angle θ is
69936. Present day stereophonic systems have
69937. RF choke used for suppressing interference in TV is generally
69938. Indicate the false statement: To combat noise
69939. Audio and video signals are called modulating waves.
69940. In AM, if modulation index is more than 100%, then
69941. The width of air gap on recording head in a tape recorder is about
69942. In a stereo tape recorder the speed of the tape is
69943. Which of the following refers to SSB suppressed carrier amplitude modulated system?
69944. The frequency at which the piezoelectric effect occurs is primarily determined by
69945. Which of the following statement regarding the advantages of the phase discriminator over the slope detector is false?
69946. The highest modulating frequency typically used in AM systems is
69947. The line of sight communication requires the transmit and receive antennas to face each other. If the transmit antenna is vertically polarized, for best reception to the receive antenna should be
69948. The bandwidth of FM for Commercial Purpose is
69949. In home tape recorders the tape width is 2 inches.
69950. If e = 10 sin(108 t + 3 sin 104 t) then carrier frequency is
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