Compressors, Gas Turbines and Jet Engines The efficiency of a jet engine is higher at High speeds Low altitudes High altitudes Low speeds High speeds Low altitudes High altitudes Low speeds ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity U < Vo Vi = Vo Vt > Vo V = Uo U < Vo Vi = Vo Vt > Vo V = Uo ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The mass of gas turbine per kW developed is about ________ as that of an I.C. engine. One fourth Same One sixth One-half One fourth Same One sixth One-half ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The work-done on a compressor will be minimum if air is taken from A source of high temperature air A source at 0° C A source of low temperature air The atmosphere A source of high temperature air A source at 0° C A source of low temperature air The atmosphere ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The gas in cooling chamber of a closed cycle gas turbine is cooled at None of the listed here Constant temperature Constant volume Constant pressure None of the listed here Constant temperature Constant volume Constant pressure ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines In a single stage, single acting reciprocating air compressor without clearance volume, the work-done is maximum during Isothermal compression None of these Polytropic compression Isentropic compression Isothermal compression None of these Polytropic compression Isentropic compression ANSWER DOWNLOAD EXAMIANS APP
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