56751. A narrow band FM does not have the following feature
56752. When number of quantization levels are two, then the average transmission power in NRZ polar signalling is __________ that of NIRZ unipolar signalling.
56753. In telecast
56754. A pulse width signal can be governed by
56755. In MTI radar, clutter means
56756. A sinusoidal carrier voltage, having frequency 1000 Hz is amplitude modulated by a sinusoidal voltage of frequency 15 kHz. The frequency of upper and lower sidebands will be
56757. Identical telephone numbers in different parts of a country are distinguished by their
56758. Consider the following statements as regards pulse repetition frequency Pulse interval should be as large as possible so that a pulse returns before next pulse is transmittedGreater the number of pulses reflected from a target, greater is the probability of distinguishing it from the noise Which of the above are correct?
56759. Which gives minimum probability of error?
56760. Which SNR denotes excellent picture quality in TV?
56761. The lower end of spinal cord in a neonate ends at the level of
56762. At f = 7 GHz, a 120 cm dish antenna gives a gain of about
56763. PIL colour picture tube has the main advantage that
56764. What is the frequency of the modulated carrier wave?
56765. Which of the following form of angle modulation in this? If e = 10 sin(108 t + 3 sin 104 t)
56766. The noise performance of a square law demodulator of AM signal is
56767. In AM the amplitude of carrier components ... while in FM it
56768. In a colour TV receiver, the function of comb filter is
56769. A communication receiver is
56770. In PCM, bit duration is defined as
56771. Assertion (A): If frequency is high, the distance between transmitter and antenna may be an appreciable fraction of wavelengthReason (R): Wavelength is inversely proportional to frequency.
56772. Speeds of sound and radio waves are equal.
56773. When Pc is the unmodulated carrier power and Pt is the total power in the modulated wave, then the maximum power in AM wave is
56774. Thermal noise is passed through an ideal low pass filter having cut off at fc = ω Hz. The auto-correlation value of the noise at the output of the filter is given as
56775. Which of the following is not advantage of FM over AM?
56776. In single tone FM discriminator (S0/N0) is
56777. In a PCM the amplitude levels are transmitted in a 7 unit code. The no. of levels is
56778. In high power AM transmission modulation is done at
56779. Which one of the following gives maximum probability of error?
56780. FM has poor efficiency than
56781. The number of spectral component when two sine wave of same frequency multiplied is
56782. Public address systems generally use electret microphones.
56783. The noise at the input to an ideal frequency detector is white. The detector is operating above threshold. The power spectral density of the noise at the output is
56784. As regards BCH code, Hamming code and Reed-Solomon code
56785. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is
56786. If carrier modulated by a digital bit stream had one of the possible phases of 0°, 90°, 180°, 270°, then the modulation is called.
56787. In FM, when the bandwidth is doubled, the signal to noise ratio improves by a factor of
56788. Pilot-carrier transmission is one in which
56789. AM-SC stands for
56790. Who, amongst the following, is associated with the Local Self-Government Act?
56791. Which stage generates RF carrier?
56792. In Modulation, "carrier" is
56793. Which one of the following blocks is not common in both AM and FM receivers?
56794. If the variance σx2 of d(n) = x(n) - x(n - 1) is one-tenth the variance σx2 of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function Rxx(x)/σx2 at k = 1 is
56795. In FM, which one is correct?
56796. In FM, increased depth of modulation increases
56797. Which of the following frequency is likely to be associated with AM radio broadcast?
56798. In which of the following schemes are several channels interleaved and transmitted together?
56799. The audio frequency range is
56800. Which of the following is an indirect method of generating FM?