56052. Which of the following has highest power gain?
56053. Two messages m1, and m2 have a probability of 0.5 each. The entropy is
56054. A TV receiver is 40 cm wide and 30 cm high. The EHT supply required is about
56055. An AM signal is detected using an envelope detector, the carrier frequency and modulating signal frequency are 1 MHz and 2 kHz respectively. An appropriate value for the time constant of the envelope detector is
56056. For signal amplitude modulated to a depth of 100% by a sinusoidal signal, power is
56057. If transmitted power is 10 kW, the field strength at a distance d is 50 mV/m. If transmitted power is reduced to 2.5 kW, the field strength at the same point will be
56058. Some features of advanced mobile phone service are To provide telephone communication to a large number of telephone users within the area of a metropolitan onlyTo use minimum amount of frequency spectrumTo permit hand held as well as vehicle operation of telephone Which of the above are true?
56059. The carrier frequency will be if L = 50 µH and C = 1 nF.
56060. Three point tracking is achieved with
56061. In TV transmitter, visual exciter may consist of Video processing unitVisual modulatorVSB filterDelay equaliserFrequency converter Which of the above are actually a part of visual exciter?
56062. The positive peak of an AM wave is 16 V and the minimum value is 4 V Assuming single tone modulation, the modulation index is
56063. In a circuit the value of resistor is made four times. The noise voltage generated by this resistance will
56064. A resistor of 10 kΩ has an rms noise voltage of 1 mV under a certain set of conditions. A resistor of 20 kΩ under the same conditions will have an rms noise voltage of
56065. In a satellite system circular polarization is to be obtained. The antenna used is
56066. A horizontal output stage is cutoff for retrace and 40% of trace. If time for each horizontal line is 64 μs and retrace time is 12 μs, the transistor is conducting for about
56067. A TV remote control works on the principle of
56068. As the magnitude of reverse bias is increased, the capacitance of varactor diode
56069. To prevent overloading in the last IF amplifier one should use
56070. Immediate intravenous solution of choice to treat a case of hypovolaemic shock is
56071. The tape recorders used in homes have
56072. In a communication system, noise is most likely to affect the signal
56073. Each frequency in the modulating wave gives rise to four side bands.
56074. Assertion (A): CCIR-B system has 625 scanning lines per frame and 2 : 1 interlace.Reason (R): The aspect ratio is 4 : 3
56075. In VHS format each video head is tilted from azimuth by
56076. The number of possible colours with a 4 line digital input monitor are
56077. Convolution of x(t + 5) with impulse function δ(t - 7) is equal to
56078. Which of the following is a better recording medium?
56079. An angle modulated signal is given by s(t) = cos 2p (2 x 106t + 30 sin 150t + 40 cos 150t). The maximum frequency and phase deviations of s(t) are
56080. The PSD and the power of a signal g(t) are respectively Sg(ω) and Pg, the PSD and the power of signal a.g(t) are respectively
56081. Most common site of adamantinoma is
56082. The simplest method of suppression of unwanted side band in AM is
56083. For attenuation of low frequencies we should use
56084. Assertion (A): A colour TV uses a SAW filter to give stable band pass response and high gain.Reason (R): Devices using SAW principle are used in many systems.
56085. At night the ionosphere can be considered to be consisting of
56086. A balun transformer gives an impedance transformation of
56087. Which one of the following is true?
56088. A 1000 kHz carrier wave modulated 40% at 40000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulator after transmission through the circuit?
56089. The EHT voltage in a picture tube of TV is
56090. In cellular telephone each cell is designed to handle
56091. A UPS contains
56092. A transmitter power of 10 W is increased by 30 dB. The effective radiated power is
56093. It is desired to couple a coaxial line to a two parallel wire line. It is best to use
56094. 24 telephone channels are frequency division multiplexed using an SSB modulation. Assuming 3 kHz per channel, the required band width is
56095. In an FM signal, the modulating frequency is 2 kHz and maximum deviation is 10 kHz. The bandwidth requirement is
56096. The effective length of antenna is different from actual length due to
56097. In a TV receiver there is no raster, no picture and no sound. The most likely defective stage is
56098. Noise can be measured by
56099. 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
56100. 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.