A 2 liters four stroke engine occupies compression ratio equals 8. The length of theconnecting rod is 15.5cm, and the engine is square (B = S). The combustion ends at 20 TDC.The engine is connected to a dynamometer which gives a brake output torque reading of 220N-m at 3600 RPM. At this speed air enters the cylinders at 85kPa and 60°C, and themechanical efficiency of the engine is 85%. Use gas constant, R: 0.287kJ/kg. K. Calculatethe following:1. brake power2. indicated power3. brake me an effective pressure4. indicated mean effective pressure5. friction mean effective pressure6. power lost to friction7. brake work per unit mass of gas in the cylinder8. brake specific power9. brake output per displacement10. engine specific volume

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Answered: A 2 liters four stroke engine occupies…

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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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
The efficiency ratio for the Otto engine is 0.60. The engine has four cylinder 7.5 cm by 11.4cm stroke, having a compression ratio of 5, and consuming 7 kg of petrol per hour whenrunning at 2000 rev/min. Taking calorific value of petrol as 44193.785 kJ/kg. Estimate theeffective pressure.
A four-stroke diesel engine has a piston diameter of 16.5 cm and a stroke of 27 cm. The compression ratio is 14.3, the cut-off 4.23% of the stroke and the mean effective pressure 4.12 bar. The engine speed is 264 rev/min and the fuel consumption is 1.076 kg of oil per hour, having a calorific value of 39150 kJ/kg. Calculate the relative efficiency of the engine.
The turbine's inlet is coupled to a steam throttling valve with inlet conditions of 2MPa and 400C. 200 kW of power may be generated by the turbine, and 100 kW of heat can be removed from the system. Assuming a mass flow rate of 1kg/s and a steam exit temperature of 300C, calculate the exit turbine pressure
The turbine's inlet is connected to a steam throttling valve with inlet conditions of 3MPa and 500C, which controls the speed of the steam. The turbine has an output power of 800kW and a heat absorption capacity of 500kW. Calculate the exit turbine pressure if the mass flow rate is 1 kg/s and the steam exit temperature is 400 degrees Celsius.
Siemens manufactures industrial steam turbines for use in various fields of application. One of the turbines offered in its catalog is the SST-400, designed for power generation. Its technical data are: - 60 MW delivered power with a flow rate of 60 kg/s. - Inlet pressure 12.5 MPa - Inlet steam temperature: 500 °C - Outlet pressure: 30 kPa Determine the quality with which the steam leaves the turbine. Explicitly state the assumptions you have made to solve the problem.
Siemens manufactures industrial steam turbines for use in various fields of application. One of the turbines offered in its catalog is the SST-400, designed for power generation. Its technical data are: - 60 MW delivered power with a flow rate of 60 kg/s. - Inlet pressure 12.5 MPa - Outlet conditions: wet steam at 30 kPa, with a quality of 0.90. Determine the temperature at which the steam enters the turbine. State explicitly, the assumptions you have made to solve the problem.
At the intake to a turbo-jet engine the air temperature is at pressure p 1 = 1.013 bar and temperatureT 1 = 220 K and the air velocity (relative to the engine) is v 1 = 200 m/s. The compressor pressure ratior p = 10 and gas is intended to exit the combustor at 1250 K. Estimate all temperatures and pressuresin the system, and the thrust developed by a heat input of 100 kW
Single stage, single-acting air compressor. Air delivery for this device is 30 bar at a speed of 1500 rev/min. The atmospheric condition of his location is 87 kPa and 20 ˚C, with a FAD of 0.22 m2/min. The clearance volume is 4% of the swept volume and the stoke/bore ratio is 1.3/1. Take “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg KW 1.What is the isothermal power of the compressor in kW to 2 decimal places in kW? 2. which formula will be used to evaluate the isothermal efficiency? 3. which formula will be used to evaluate the delivery volume? 4. What is the induced volume in terms of stroke volume, provide the coefficient values of the swept volume to 4 decimal places?
Steam is expanded isentropic ally in the high pressure cylinder of a steam turbine from a pressure of 2 Mpa at 350 0C to 0.1 Mpa. Isentropic expansion is then continued down to 7 KN/m2 in the low pressure cylinder. Calculate the percentage of the total work output that is performed by the H.P cylinder. Ans [62.7]
Given that μ = 0.25Katm−1 for nitrogen, calculate the value of its isothermal Joule–Thomson coefficient. Calculate the energy that must be supplied as heat to maintain constant temperature when 15.0 mol N2 flows through a throttle in an isothermal Joule–Thomson experiment and the pressure drop is 75 atm.
[4] A multi-storied shopping mall has installed 5 x 110 TR reciprocating compressors of which four compressors are in use and fully loaded for 14 hours per day. The specific power consumption of reciprocating compressor is 0.8 kW/TR. Due to higher energy cost the shopping mall chief engineer has decided to replace reciprocating compressors with screw compressors having specific power consumption of 0.65 kW/TR. The chief engineer needs thefollowing input from energy consultant: • Comparison of power and electricity consumption of both reciprocating and screw compressors?

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