吉大《发动机原理》在线作业二（Kyrgyzstan engine principle of online homework two）.doc

吉大《发动机原理》在线作业二（Kyrgyzstan engine principle of online homework two） Kyrgyzstan engine principle of online homework two Total score: 100 test time: - Radio examination Judgment question Radio examination questions (20 questions, 80 points) 1., the percentage of heat converted to effective heat in the gasoline engine is A. 25-30% B. 30-40% C. 35-45% D. 40-50% Full marks: 4 The total power characteristic of the 2. engine throttle when it is opened to maximum is () A. partial speed characteristic B. load characteristics C. universal property D. external characteristics Full marks: 4 3. which stroke has the highest temperature in the actual cycle of the four stroke engine? () A. intake B. compression C. work D. exhaust Full marks: 4 4. what kind of harmful substance does the automobile engine emit at a certain concentration, because of the absorption of light, the atmosphere can be colored, so as to obviously reduce the visibility of the atmosphere and affect the underground or air traffic () A. CO B. HC C. NO2 D. NO Full marks: 4 5., the relationship with the gasoline engine cold start performance is the biggest A. 1% distillation temperature B. 10% distillation temperature C. 20% distillation temperature D. 30% distillation temperature Full marks: 4 6. the factors that affect the efficiency of gas charging include intake end state, pressure, PA, end of air temperature, Ta, residual gas coefficient, gamma, phase and phase of gas distribution A. compression ratio B. ventilation loss Overlap angle of C. valve D. combustion chamber scavenging Full marks: 4 7. the exhaust valve is located () open at the piston A. before the power stroke B. when the work trip is going to end C. before the intake stroke starts D. after the intake stroke begins Full marks: 4 8., the provisions of the countrys light diesel oil sixteen alkane value is not less than () A. 10 B. 25 C. 45 D. 55 Full marks: 4 9., when the engine speed is constant, the relationship between the economic index and the c