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An antenna pointing in a certain direction has a noise temperature of 50 K. The ambient temperature is 290 K. The antenna is connected to a pre-amplifier that has a noise figure of 2 dB and an available gain of 40 dB over an effective bandwidth of 121 AnswerThe directivity of an antenna array can be increased by adding more antenna elements, as a larger number of elements - GATE EC 20151 Answer Define noise Discuss in brief the various sources of noise Write a brief note on noise abatement and control?1 AnswerA ir is held inside a non-insulated cylinder using a piston (mass M=25 kg and area A=100 cm2) and stoppers (of negligible area), as shown in the figure. The initial pressure i P and temperature i T of air inside the cylinder are 200 kPa and 400C, respectively. The ambient pressure P and temperature T are 100 kPa and 27C, respectively. The temperature of the air inside the cylinder (C) at which the piston will begin to move is _________ (correct to two decimal places).1 AnswerDefine direction and brief about the main five requirements of effective direction Jun12.1 AnswerA mbient air at 30◦C dry bulb temperature and 80% relative humidity was heated to a dry bulb temperature of 80◦C in a heat exchanger by indirect heating. The amount of moisture gain (g kg-1 dry air) during the process would be _______.0 AnswerDecibel is :1 AnswerT he rate of heat transfer from a metal plate is 1000 W m-2. The surface temperature of the plate is 120◦C and ambient temperature is 20◦C. The convective heat transfer coefficient (W m-2 ◦C-1) using the Newton’s law of cooling will be _______.0 AnswerMetals approach super conductivity condition0 AnswerWhich one of the following factors is NOT desirable for effective phosphorus removal in BOF steelmaking process? (-Gate Metallurgical Engineering 2014)1 AnswerT he wall of a pipe of radius 1 m is at a uniform temperature of 200 oC, and is covered by insulation of thickness 0.1 m. The ambient air outside the insulated pipe is at 20 oC and has heat transfer coefficient of 10 W m-2 K-1. The thermal conductivity of the insulation material is 0.05 W m-1 K-1. If the heat transfer occurs at steady state, the temperature (in oC) of the outer surface of insulation is __________ (rounded off to second decimal place).0 AnswerThe Switch is switched off once the temperature falls below 18 and then it is turned on when the temperature is more than 21. When the temperature is more than 21. Identify the Equivalance values which belong to the same class.1 AnswerThe speed of sound in the ocean depends on1 AnswerThe electric field of a uniform plane wave travelling along the negative z direction is given by the following equation: 𝐸�⃗ 𝑤 𝑖 = �𝑎�𝑥 + 𝑗𝑎�𝑦�𝐸0𝑒𝑗𝑘𝑧 This wave is incident upon a receiving antenna pl1 AnswerThe differential amplifier is connected as shown in the figure(b) above to a single strain gage bridge. Let the strain gage resistance vary around its no load resistance R by ±1%. GATE-Instrumentational-Engineering-20131 AnswerT he humidity of air at a dry-bulb temperature of 65 oC is 0.025 kg water/kg dry air. The latent heat of vaporization of water at 0 oC is 2500 kJ/kg. The psychrometric ratio of air is 0.95 kJ (kg dry air)-1 K-1. Considering 0 oC as reference temperature, the enthalpy of air (in kJ/kg) at its adiabatic saturation temperature of 35 oC is ___________ (rounded off to two decimal places).0 AnswerWhat is the purpose of ‘evolved Laser Interferometer Space Antenna (eLISA)’ project?0 AnswerA long straight wire, having radius 𝑎 and resistance per unit length 𝑟, carries a current 𝐼. The magnitude and direction of the Poynting vector on the surface of the wire is2 AnswerAn npn bipolar junction transistor (BJT) is operating in the active region. If the reverse bias across the base – collector junction is increased, then1 AnswerAn air-conditioner maintains the room temperature at 27 oC while the outside temperature is 47 oC. The heat conducted through the walls of the room from outside to inside due to temperature difference is 7000 W. The minimum work done by the compressor of the air-conditioner per unit time is ________ W1 Answer
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