wrong answers:1. 415kw2. 0.21473. 0.595 4. 35.31 SHOW CORRECT ANSWER DO NOT COPY ANYONE 1. A diesel engine produces 500 kW at 3800 rpm while consuming 0.02975 kg/s of fuel.During operation, data shows that its mechanical energy loses 17%, the actual volumeof air going into each cylinder is 90% (The volumetric efficiency has a negligiblevariation) and the actual fuel to air ratio is 0.05. If the ambient temperature at thislocation is 18 °C and the standard atmospheric condition is 14 °C hotter with pressure of100 kPa, what are the standard parameters of the engine:a) Brake Power, kWb) Indicated Specific Fuel Consumption, kg/kW-hrc) Mass of air, kg/sd) Indicated Mean Effective Pressure, kPa

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Answered: 1. A diesel engine produces 500 kW at…

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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2. In a 30-minute trial of an oil engine running at 1750 rpm, the engine consumes 27.3 kg of fuel with a calorific value of 42,300 kJ/kg at a brake torque of 1640 N-m. There are 880 kg of jacketed cooling water system in the engine entering at 17 deg C and leaves at 77 deg C. There are 310 kg of air entering the intake manifold. The temperature of air at the intake manifold is 19 deg C and the temperature at the exhaust manifold is 586 deg C. Assuming mean specific heat capacity of exhaust gas to be 1.25 kJ/kg-K, determine the following D) Exhaust loss in kJ/min E) Radiation and Unaccounted Losses in kJ/min
1. An engine from a quarry vehicle used in the Build a Beach program of DEMR has a power requirement of 560 kW. Per hour of its operation, it ejects 234 MJ into its surroundings at 50 °C. If it behaves like a Carnot engine, answer the questions below. A. How much work (MJ) is done by the engine per hour of operation? B. What is the efficiency (%) of the engine?C. What is the temperature (°C) of the hot reservoir? 2. Determine the entropy change (kJ/K) associated to the conversion of 10 kg of ice at -11 °C to steam at 121 °C. 3. Anna and Beth are using another rare metal, the nth metal (c = 0.600 J/g-℃), to build the 5-kg cuirass of their design. Initially, the metal is at 2250 K. It is then submerged to 10 kg of water at 15 °C. If the remaining liquid water after submerging the metal is 8.5 kg, solve for the net entropy change (kJ/K) of the system.
2. In a 30-minute trial of an oil engine running at 1750 rpm, the engine consumes 27.3 kg of fuel with a calorific value of 42,300 kJ/kg at a brake torque of 1640 N-m. There are 880 kg of jacketed cooling water system in the engine entering at 17 deg C and leaves at 77 deg C. There are 310 kg of air entering the intake manifold. The temperature of air at the intake manifold is 19 deg C and the temperature at the exhaust manifold is 586 deg C. Assuming mean specific heat capacity of exhaust gas to be 1.25 kJ/kg-K, determine the following A) The brake horsepower in B) Energy chargeable to the engine in kJ/min C) Cooling loss in kJ/min D) Exhaust loss in kJ/min E) Radiation and kJ/min Unaccounted Losses in
In an engine working on the Diesel eycle the ratios of the weights of air and fuel supplied is 50: 1. The temperature of air at the beginning of the compression is 60 °C and the compression ratio used is 14: 1. What is the ideal efficiency of the engine, Calorifie value of fuel used is 42000 k.J/kg. Assume C, - 1.004 kJ/kg K and C, = 0.717 kJ/kg K for air.
8. . Equation for Law of conservation of mass and energy for a nozzle is
John’s automobile has a three-liter SI-V6 engine that operates on a four-stroke cycle at 3600 RPM. The compression ratio is 9.5, the length of connecting rods is 16.6 cm, and the engine is square (B=S). at this speed, combustion ends at 20o at T.D.C. This engine is connected to Dynamometer which gives a brake output torque reading of 205 N-m. At his speed, air enters the cylinders at 85 kPa and 60o C, and the mechanical efficiency of the engine is 85%. Calculate: (a) Brake power, HP || (b) Indicated Power, HP || (c) Brake Mean Effective Pressure, Bmep , Psia || (d) Indicated Mean Effective Pressure, Imep, Psia || (e) Friction Mean Effective Pressure, Fmep, Psia
(17 blanks) Calculate the efficiency of the Carnot Engine for ideal gas. Consider the figure below for a complete cycle of Carnot engine, where the cycle goes from ad->ab->bc->cd Carnot cycle Он TH Tc - V 02016 Pearson Education, Inc. processes: processes and segment ab & cd are the Where segments ad & bc are the and the volumes involved are Va, Vb, Vc, Vd, and the two temperatures TC and
You have been asked to help with the low-pressure compressor (LPC) design for a turbofan engine with a bypass ratio of 8.4. The preliminary cycle design calls for the LPC to produce a pressure ratio of 9.4 with the following operating conditions and constraints. .Inlet Conditions TO2 Poz Core Air Mass Flowrate (kg/s) (K) (kPa) 282 24.6 47.0 Design Constraints Maximum Polytropic Efficiency 94.1% Maximum Stage Pr 1.55 Estimate the minimum number of stages required for this LPC. Then assuming the 1st stage of the LPC operates at the maximum allowable pressure ratio, determine the stagnation temperature exiting the 1st stage, and the stage's adiabatic efficiency. Also determine the power (W) required to operate the full LPC (not just 1st stage). Finally, what would be the percent change in the required power if the polytropic efficiency was only 90.0%.
If there are five different Carnot engines (C1, C2, C3, C4 and C5) with low temperature reservoirs are at 7 "C, 10 °C, 13 "C, 15 °C and 18 °C respectively and each engine has efficiency of 60%. It is desired to increase the efficiency of each engine to 75 %. By using the selections statements calculate that how many degree the temperature of the source of each Carnot engine be increased separately. Do a subplot of bar and stem Plot of the temperature of the source against each heat engine Cl, C2, C3, C4 and C5. [Hint: Efficiency of heat engine is , Use else if else as selection statement. And take all the inputs by using input command and take all the outputs by using fprintf command.]
Question B3 The engine of an aeroplane is equipped with an ideal convergent nozzle with an area ratio Ainlet 2.035 ( -A-2.035), as in Figure Q-B3. The aeroplane is flying at an altitude of 11 Aexit km where the atmospheric pressure and temperature are 0.23 bar and 216K respectively. You may assume the combustion gases entering the nozzle have the same property as air (i.e. y=1.40, R=287 J/kgK and Cp-1004.5J/kgK). Page 6 Question B3 continued inlet exit Amles/Aexit -AVAJ-2.035 Figure Q-B3 a) If the nozzle operates at its critical condition, calculate: the inlet Mach number M;. nozzle's exit velocity V, the inlet stagnation pressure Por- the inlet static pressure FG The stagnation Aj P, and the nozzle's gross thrust per unit exit area temperature of the gases entering the nozzle is To 1200 K. b) If the stagnation pressure at the inlet of the nozzle is reduced to 80% of its value in part (a), determine the exit static temperature 7;, the nozzle's gross thrust per unit exit area FG. The…
A solar plate collector maintains a hot water reservoir at 90 °C. A. Calculate the efficiency of a Carnot engine operating between this temperature and an exhaust temperature of 30 °C. B. Based on the thermodynamic efficiency in (A), how much heat (in J) must be absorbed by the Carnot engine from the hot reservoir per hour in order to provide one kilowatt of power? (Note: 1 watt = 1 J s'4) C. Draw schematically a composite engine consisting of the Carnot engine in (A) which drives a Carnot refrigerator with a working temperature of 10 °C and 30 °C (with a common reservoir at 30 °C). D. For the composite engine in (C), and assuming maximum efficiency, how much heat (in J) must be withdrawn by the refrigerator per hour in order to maintain its temperature at 10 °C? No need to input your answer for letter C.
The parameters of the initial state of one kilogram of air in the cycle of an internal combustion engine are 0.095 MPa and 65 deg.C. The compression ratio is 12. Compare the values of the thermal efficiency for isobaric and isometric heat supply in the amounts of 820 kJ.

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