Engine Cycles
Quiz by M Jones
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5 questions
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- Q1Which of the following statements is INCORRECT about the compression stroke in a diesel engine?adiabatic changeno time for heat transfercompression stroke occurs in short timeapproximately isovolumetric45s
- Q2Which of the following statements is INCORRECT about why, in a diesel engine, the fuel starts to be injected into the cylinder slightly before the piston reaches its highest point in the cylinder?max pressure obtained when piston is at top of strokethere would not be enough space in the cylinder for the fuel when the piston was at the top of its strokethe fuel has partially evaporatedstarted to burn when piston is at top of stroke60s
- Q3When a engine consumes gas of calorific value 36 MJ kg–1 at a rate of 9.6 kg h–1, it will deliver a useful mechanical output power of 80 kW. What is the input power?96 kW3.8 MW346 MW4.3 kW60s
- Q4Calculate the maximum possible efficiency of any heat engine which operates between temperatures of 1600 K and 460 K.55%16%2.5%71%60s
- Q5Test-bed measurements made on a single-cylinder 4-stroke petrol engine produced the following data: mean temperature of gases in cylinder during combustion stroke 820 °C mean temperature of exhaust gases 77 °C area enclosed by indicator diagram loop 380 J rotational speed of output shaft 1800 rev min–1 power developed by engine at output shaft 4.7 kW calorific value of fuel 45 MJ kg–1 flow rate of fuel 2.1 × 10–2 kg min–1 What is the maximum theoretical efficiency of the engine?21%68%91%9.6%60s