69551. 24 telephone channels are frequency division multiplexed using an SSB modulation. Assuming 3 kHz per channel, the required band width is
69552. In an FM signal, the modulating frequency is 2 kHz and maximum deviation is 10 kHz. The bandwidth requirement is
69553. The effective length of antenna is different from actual length due to
69554. In a TV receiver there is no raster, no picture and no sound. The most likely defective stage is
69555. Noise can be measured by
69556. A 100 + j 100 Ω load is to be matched to a line with Z0 = 300 Ω to give SWR = 1. The reactance of stub is
69557. Assertion (A): For satellites and space probes, PRF of a radar is pretty low.Reason (R): PRF of a radar depends on the range of a radar.
69558. An S/N ratio of 3 expressed in db is
69559. The material used for the magnet of moving coil cone type loudspeaker is
69560. CCIR system B employs
69561. The power to the base unit of a cordless telephone is supplied by
69562. If velocity of sound waves in air at 0°C is 330 m/s, the velocity at 40°C is about
69563. A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is
69564. In FM, as bandwidth increases
69565. A 400 W carrier is amplitude modulated with m = 0.75. If single side band suppressed carrier is used the total power in modulated wave is
69566. In TV transmitter, the function of duplexer is
69567. Microwave link repeaters are typically 50 km apart in TV transmission due to
69568. Assertion (A): The colour signal consists of only luminance signalReason (R): In India PAL colour signal system is used.
69569. To separate channels in FDM receiver we have to use
69570. A device with input x(t) and y(t) is characterized by y(t) = x2(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is
69571. Assertion (A): Bandwidth of a TV signal is 5 MHz.Reason (R): TV systems use vestigial side band transmission.
69572. If sound intensity is 8 W/m2, the dB level of this sound is about
69573. The distance of a direct broadcasting satellite from earth's surface is about
69574. Which of the following microphones has an inbuilt amplifier?
69575. UHF range is
69576. In asynchronous TDM, for n signal sources, each frame contains m slots, where m is usually
69577. How much is contributed by each bit in the code word of a PCM system under uniform and symmetric quantization to the signal to noise ratio?
69578. Noise which assumes great importance at high frequencies is
69579. Which one is Analog Continuous modulation technique?
69580. AM transmitter employing low level modulation
69581. As the area of a public meeting increases the amplifier power output required increases.
69582. The number of spectral component when two cosine waves are multiplied of different frequency
69583. Radiation resistance of an antenna is a
69584. A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 μ sec. Which of the following frequencies will not be in the modulated signal?
69585. The input to a coherent detector is DSB - SC signal plus noise. The noise at the detector output is
69586. All of the output pulses are at full transmitter power for a strong signal in all of the following except
69587. A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is
69588. The spectrum of the white noise and an impulse function is similar in following aspects
69589. In a telephone system, the grade of service means
69590. A longwave AM broadcast transmitter needs
69591. AGC voltage is applied to the stages which are
69592. LCD uses
69593. Which of the following stage is not present in AM receiver as compared to FM receiver?
69594. The function of duplexer in a RADAR is
69595. If e = 10 cos (2p x 108t + 20 cos 2p 103t). The bandwidth is
69596. In FM, as the modulating frequency decreases and the modulating voltage amplitude
69597. Modulation system used for video-modulation in television broadcast is
69598. The highest modulation frequencies typically used in FM broadcast is
69599. The intermediate frequency of a superheterodyne receiver is 450 kHz. If it is tuned to 1200 kHz, the image frequency will be
69600. In the above case the modulation index will be
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