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1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is 42MJ/kg. Determine (i) the heat received by the engine; (ii) the power output in kW, and (iii) the mass of fuel used/h

1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is 42MJ/kg. Determine (i) the heat received by the engine; (ii) the power output in kW, and (iii) the mass of fuel used/h

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is 42MJ/kg. Determine (i) the heat received by the engine; (ii) the power output in kW, and (iii) the mass of fuel used/h 2. A 20kg block of iron at 50°C is dropped into an insulated tank which contains 0.5m of water at 25°C. If the specific heat of the iron, Cpiron, is 0.45 kJ/kg°C and the specific heat of the water, Cpwater, is 4.184 kJ/kg'C. Determine: (a) mass of the water; s) (b) the temperature at which thermal equilibrium is reached, and For equilibrium AUsystem-AUron+AUwater 0 (c) the amount of energy added to the water. AU =mwaterCpwater (tequili"twater) water The barometer of a mountain hiker reads 910mbars at the beginning of the hike and 710mbars at the end. 3. (а) Determine the vertical distance climbed. You can assume an average air density of 1.2kg/m 4.
Transcribed Image Text:1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is 42MJ/kg. Determine (i) the heat received by the engine; (ii) the power output in kW, and (iii) the mass of fuel used/h 2. A 20kg block of iron at 50°C is dropped into an insulated tank which contains 0.5m of water at 25°C. If the specific heat of the iron, Cpiron, is 0.45 kJ/kg°C and the specific heat of the water, Cpwater, is 4.184 kJ/kg'C. Determine: (a) mass of the water; s) (b) the temperature at which thermal equilibrium is reached, and For equilibrium AUsystem-AUron+AUwater 0 (c) the amount of energy added to the water. AU =mwaterCpwater (tequili"twater) water The barometer of a mountain hiker reads 910mbars at the beginning of the hike and 710mbars at the end. 3. (а) Determine the vertical distance climbed. You can assume an average air density of 1.2kg/m 4.
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