1. To approximate an actual spark-ignition engine consider an air-standard Otto cycle that has a heat addition of 1800 kJ/kg of air, a compression ratio of 7, and a pressure and temperature at the beginning of the compression process of 90 kPa, 10°C. Assuming constant specific heat, determine the maximum pressure and temperature of the cycle and the thermal efficiency of the cycle.

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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1. To approximate an actual spark-ignition engine consider an air-standard Otto cycle
that has a heat addition of 1800 kJ/kg of air, a compression ratio of 7, and a pressure
and temperature at the beginning of the compression process of 90 kPa, 10°C.
Assuming constant specific heat, determine the maximum pressure and temperature of
the cycle and the thermal efficiency of the cycle.
2. In an air standard Otto Cycle, air enters at 101.25Kpa and 36°C. The compression
ratio is 4:1. If the network of the cycle is 125 KJ/Kg. Calculate the heat supplied in
KJ/Kg.
3. An engine Operates on the air-standard Otto Cycle. The cycle work is 1050KJ/kg.
What is the compression ratio of the engine if the maximum cycle temperature is 3176K
and temperature at the end of isentropic compression is 950K?
Transcribed Image Text:1. To approximate an actual spark-ignition engine consider an air-standard Otto cycle that has a heat addition of 1800 kJ/kg of air, a compression ratio of 7, and a pressure and temperature at the beginning of the compression process of 90 kPa, 10°C. Assuming constant specific heat, determine the maximum pressure and temperature of the cycle and the thermal efficiency of the cycle. 2. In an air standard Otto Cycle, air enters at 101.25Kpa and 36°C. The compression ratio is 4:1. If the network of the cycle is 125 KJ/Kg. Calculate the heat supplied in KJ/Kg. 3. An engine Operates on the air-standard Otto Cycle. The cycle work is 1050KJ/kg. What is the compression ratio of the engine if the maximum cycle temperature is 3176K and temperature at the end of isentropic compression is 950K?
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