You Are On Multi Choice Question Bank SET 1136
56801. Figure of merit is always unity in
56802. Which of the following modulation is analog in nature?
56803. In the spectrum of a FM wave
56804. The gap width in audio heads is about 0.01 mm.
56805. The tuned circuit of the oscillator in a simple AM transmitter employs a 50 H coil and a 1 nanofarad capacitor. If the oscillator output is the carrier frequency will be
56806. In a low level AM system, the amplifier which follows the modulated stage must be the
56807. In a square law modulator, the carrier frequency should be __________ times than the highest modulating frequency.
56808. CSSB stands for
56809. Tropospheric scatter is used with frequencies in the range of
56810. The PAM Signal can be detected by
56811. FM is named so because
56812. Which statement is incorrect for the signal x(t) = 5 sin (2p x 103t) sin (2p x 106t)?
56813. In radio receivers, the value of IF is
56814. If F(ω) is Fourier transform of f(t), then Fourier transform of f(t) cos2 ωct is
56815. If the target cross-section is changing, the best scanning system for accurate tracking is
56816. If e = 10 sin(108 t + 3 sin 104 t) then the modulation index is
56817. Frequency modulation consists in
56818. Pulse modulation is often used in
56819. Thermal noise has a power spectral density which is quite uniform upto frequencies in the order of
56820. In cell communication
56821. A ground wave travels along surface of ground.
56822. In narrowband FM, the modulation index is
56823. A single-sideband (SSB) signal contains 3 kW. The power content of the carrier is __________ kW.
56824. Waves of frequencies higher than 30 MHz penetrate the atmosphere.
56825. Armstrong modulator generates
56826. The opposite of the word ‘Acquitted’ is ..........?
56827. To select one out of N equally probable events, the number of bits required is
56828. What is the frequency of audio modulation?
56829. The RF section of a radio transmit generally consists of
56830. The storage capacity of audio CD is 540 Mb per side.
56831. In case of a low level AM transmitter, the amplifier modulated stage must be
56832. The device most likely to be found in an SSB transmitter is
56833. Point out the false statement
56834. In a low level AM system, the modulated amplifiers stage must be
56835. An angle modulated signal is expressed by fa(t) = cos (2 x 108 p t) + 75 sin (2 x 103 p t). The peak frequency deviation of the carrier is
56836. The amplitude of a modulated RF aerial current is 6 A on the peaks of modulation and 4 A on the troughs of modulation. The value of carrier amplitude is
56837. In practical commercial AM system channel bandwidth is
56838. The currents fed to the two dipoles of turnstile antenna are
56839. The circuit of figure give an output which is
56840. Which of the following microphones has lowest output impedance?
56841. High frequency waves are
56842. During fast forward operation of a tape recorder
56843. Homodyne detection means
56844. A radio station works at 800 kHz and uses AM. If this is a public broadcast system, it should transmit using
56845. In a superheterodyne broadcast receiver, the frequency of local oscillator is __________ the incoming signal frequency.
56846. PAL stands for
56847. In free space, line of sight propagation case, the transmission losses between transmitter and receiver increase with frequency (f) as
56848. Which of the following disorder is characterized by restricted repetitive and stereotyped behavior?
56849. PCM : Quantising Noise :: Transistor :
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56850. The antenna current of an AM transmitter is 8 A. When only the carrier is sent, but it increases to 8.93 A. when the carrier is sinusoidally modulated. The percentage modulation is nearly
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