GATE ME 2014 Set 4 — Question 59
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Thermodynamics → IC Engines → Otto, Diesel & Dual Cycles
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Question
In a compression ignition engine, the inlet air pressure is 1 bar and the pressure at the end of isentropic compression is 32.42 bar. The expansion ratio is 8. Assuming ratio of specific heats () as 1.4, the air standard efficiency (in percent) is __________.
Correct answer
59 to 61
Solution
A compression-ignition engine follows the air-standard Diesel cycle.1. Compression ratio (isentropic 1-2):2. Cut-off ratio. Heat rejection is at constant volume, so and the expansion ratio is :3. EfficiencyAnswer: about
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