In a test of an oil engine under full load condition the following resulta were obtained. 33 kW H 27 kW brake power Fuel used 8 kg/h Rate of flow of water through gas calorimeter 12 kg/min Cooling water flow rate 7 kg/min Calorific value of fuel 43 MJ/kg 15 °C 75 °C Inlet temperature of cooling water Outlet temperature of cooling water Inlet temperature of water to exhaust gas calorimeter 15 °C 1 H = 55 °C Outlet temperature of water to exhaust gas calorimeter Final temperature of the exhaust gases 80 °C Room temperature 17 °C 20 Air-fuel ratio on mass basis Mean specific heat of exhaust gas Specific heat of water 1 kJ/kg K 4.18 J/kg K Draw up a heat balance sheet and estimate the thermal and mechanical efficiencies. H - =

In a test of an oil engine under full load condition the following resulta were obtained. 33 kW H 27 kW brake power Fuel used 8 kg/h Rate of flow of water through gas calorimeter 12 kg/min Cooling water flow rate 7 kg/min Calorific value of fuel 43 MJ/kg 15 °C 75 °C Inlet temperature of cooling water Outlet temperature of cooling water Inlet temperature of water to exhaust gas calorimeter 15 °C 1 H = 55 °C Outlet temperature of water to exhaust gas calorimeter Final temperature of the exhaust gases 80 °C Room temperature 17 °C 20 Air-fuel ratio on mass basis Mean specific heat of exhaust gas Specific heat of water 1 kJ/kg K 4.18 J/kg K Draw up a heat balance sheet and estimate the thermal and mechanical efficiencies. H - =

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Assuming the clearance is negligible for a single stage compressor with the following data.Atmospheric pressure: 90 kPaAtmospheric temperature: 17 ˚CDelivery pressure: 7 barFree air delivery flow rate: 0.2 m3/min Take “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K 1.Evaluate the mass flow rate of air inside the compressor operating isentropically in kg/min to 3 decimal places.
a) A nozzle is a device that is used to increase the velocity of a fluid by varying the cross-sectional area. At the last section of a jet engine (Fig Q1.a, section 5), air with a mass flow rate of 50 kg/s at a pressure of 500 kPa and a temperature of 600 K enters a nozzle with an inlet cross-sectional area of 5 m2. The exit area of the nozzle is 20% of its inlet area. The air leaves the nozzle at a velocity of 300 m/s. The nozzle is not well-insulated and during this process, 5 kJ/kg heat is lost.Figure Q1.a: Schematic of a Jet engine.(i) In analysing this nozzle using the 1st law of thermodynamics, the change in which type of energy is negligible? (ii) Determine the density and velocity of the air entering thenozzle.(iii) Calculate the density of the air as it leaves the nozzle.l(iv) Determine the temperature of the air as it leaves the nozzle. ((v) Calculate the pressure of the air as it leaves the nozzle Only solve V please
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A differential thermocouple with sensors at the inlet and exit of a pump indicates that the temperature of water rises 0.048° F as it flows through the pump at a rate of 1.5 ft3/s. If the shaft power input to the pump is 23 hp and the heat loss to the surrounding air is negligible, determine the mechanical efficiency of the pump.
The fluid condition at the inlet and exit of a horizontal convergent nozzle is analysed. The nozzle is operating steadily and heat loss is assumed negligible. If the specific enthalpy of fluid and velocity of the fluid at the inlet are 3000kJ/kg and 220km/hr respectively. At the exit, the specific enthalpy of fluids is 2,7×10^6 J/kg. Determine (a) the velocity of the fluid at the exit of the nozzle in (m/s), (b) Determine the rate of flow of fluid (mass flow rate) when the inlet area is 0,2m^2 and the specific volume at the inlet is 0,3m^3/kg, (c)Determine exit area of the nozzle when the specific volume at the nozzle exit is 0,6 m^3/kg.
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The static and stagnation pressures of a fluid in a pipe are measured by a piezometer and a pitot tube. The heights of the fluid in the piezometer and pitot tube are measured to be 2.2 m and 2.0 m, respectively. If the density of the fluid is 5000 kg/m3, the velocity of the fluid in the pipe is (a) 0.92 m/s (b) 1.43 m/s (c) 1.65 m/s (d ) 1.98 m/s (e) 2.39 m/s
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The volumetric flow rate of standard air is 120 m3/s at drybulb temperature of 18oC. Compute the standard air volume considering that standard air pressure is 101.325 kPa and standard air temperature at 21.11oC. a.) 121.3 m3/s b.) 200.4 m3/s c.) 304.5 m3/s d.) 405.7 m3/s