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A diesel engine has a compression ratio of 17 and cut-off take place at 10% of the stroke. Assuming ratio of specific heats ( γ ) as 1.4, the air-standard efficiency (in percent) is______. (Gate mechanical engineering 2014)1 AnswerThe intake pressure of a diesel engine is 1 bar and pressure at the end of the compression is 34 bar. The adiabatic exponent is 1.3 and the expansion ratio is 7. The diesel cycle efficiency in percentage is __________________ Gate-Agricultural-20161 AnswerAn air standard Otto cycle has thermal efficiency of 0.5 and the mean effective pressure of the cycle is 1000 kPa. For air, assume specific heat ratio = 1.4 and specific gas constant R = 0.287 kJ/kg·K. If the pressure and temperature at the beginning of the compression stroke are 100 kPa and 300 K, respectively, then the specific net work output of the cycle is ______ kJ/kg (round off to two decimal places).0 AnswerAn engine working on air standard Otto cycle is supplied with air at 0.1 MPa and 35C. The compression ratio is 8. The heat supplied is 500 kJ/kg. Property data for air: p c = 1.005 kJ/kg K, v c = 0.718 kJ/kg K, R = 0.287 kJ/kg K. The maximum temperature (in K) of the cycle is (Gate 2018 Mechanical engineering)0 AnswerAn axial compressor that generates a stagnation pressure ratio of 4.0, operates with inlet and exit stagnation temperatures of 300 K and 480 K, respectively. If the ratio of specific heats (𝛾) is 1.4, the isentropic efficiency of the compressor is (GATE-Aerospace-Engineering-2018 )1 AnswerA vehicle powered by a spark ignition engine follows air standard Otto cycle (=1.4). The engine generates 70 kW while consuming 10.3 kg/hr of fuel. The calorific value of fuel is 44,000 kJ/kg. The compression ratio is _______ (correct to two decimal places).1 AnswerA ir enters into an engine cylinder at a pressure of 100 kPa and temperature of 300 K in the suction stroke of an ideal Otto cycle. The cylinder clearance volume is 600 cm^3 and compression ratio is 8:1. The expansion stroke of the cycle is polytropic in nature. The pressure at the beginning of the expansion stroke is 10 MPa and the temperature at the end of the expansion stroke is 1800 K. The polytropic exponent of the expansion stroke is ________. (GATE-Agricultural-Engineering-2018)0 AnswerAn aircraft with a turbojet engine flies at a velocity of 100 m/s. If the jet exhaust velocity is 300 m/s, the propulsive efficiency of the engine, assuming a negligible fuel-air ratio, is (GATE-Aerospace-Engineering-2018)1 AnswerA power tiller with diesel engine produces 12 kW of brake power with a brake thermal efficiency of 30%. If the air-fuel ratio in the combustion process is 14:1 and heating value of the fuel is 45 MJ kg^-1, air consumption rate of the engine will be ________ kg h^-1 (GATE-Agricultural-Engineering-2018)0 AnswerA 3-cylinder 4-stroke CI engine coupled with a turbocharger has a bore and stroke length of 120 mm and 130 mm, respectively. The engine is running at 1600 rpm with a volumetric efficiency of 150%. The air to fuel ratio for complete combustion on weight basis is 14.9:1 and the density of air entering the cylinder is 1.2 kg m-3 . The fuel consumption in kg h-1 is0 AnswerWhat is the range of compression ratio for SI and diesel engine?1 AnswerAn ideal Brayton cycle, operating between the pressure limits of 1 bar and 6 bar -gate-mechanical-20111 AnswerA gas turbine with air as the working fluid has an isentropic efficiency of 0.70 when operating at a pressure ratio of 3. Now, the pressure ratio of the turbine is increased to 5, while maintaining the same inlet conditions. Assume air as a perfect gas with specific heat ratio 1.4 . If the specific work output remains the same for both the cases, the isentropic efficiency of the turbine at the pressure ratio of 5 is ______ (round off to two decimal places)0 AnswerA rocket motor has combustion chamber temperature of 2600 K and the products have molecular weight of 25 g/mol and ratio of specific heats 1.2. GATE-Aerospace Engineering-Question-20121 AnswerConsider a simple gas turbine (Brayton) cycle and a gas turbine cycle with perfect regeneration. In both the cycles, the pressure ratio is 6 and the ratio of the specific heats of the working medium is 1.4. The ratio of minimum to maximum temperature1 AnswerAir at 50 kPa pressure and 400 K temperature flows in a duct at Mach 3.0. A part of the flow leaks through an opening on the duct wall into the ambient, where the pressure is 30 kPa. The maximum Mach number achieved in the discharge is _______ (accurate to two decimal places). (Ratio of specific heats of air is 𝛾=1.4). (GATE-Aerospace-Engineering-2018)1 AnswerWith a neat sketch explain the working of 2 stroke petrol engine with the help of a p-v diagram.2 AnswerWith a neat sketch explain the working of 4 stroke petrol engine with the help of a p-v diagram.1 Answer(Gate 2018 Mechanical engineering)An ideal gas undergoes a process from state 1 ( T1 = 300 K, 1 p = 100 kPa) to state 2 ( T2 = 600 K, 2 p = 500 kPa). The specific heats of the ideal gas are : cp = 1 kJ/kg-K and cv = 0.7 kJ/kg-K. The change in specific entropy of the ideal gas from state 1 to state 2 (in kJ/kg-K) is ___________0 AnswerKönigsberger ratio refers to: (-Gate geology and geophysics 2014)1 Answer
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