1 primary mechanic mechanic theory knowledge test ticket number: ___________________ Name: ________________ score: ________________ A multiple-choice questions (only one option is correct, the correct option to fill in brackets, 1 point for each question, a total of 80 points) Four-stroke diesel engine working cycle, crankshaft rotation () weeks.
A.1 B.2 C.3 D.4 2, a cycle of four-stroke diesel engine, camshaft rotation () weeks.
A.1 B.2 C.3 D.4 3, compression Top dead center is the position of the top of the piston in the compression stroke ().
A. Start B. End C. Midway 4. The compression ratio is the ratio of () to the volume of the combustion chamber.
A. The volume of the combustion chamber B. The working volume of the cylinder C. The total volume of the cylinder 5. The injection advance angle is the angle between the position of the crankshaft when the injector starts to inject fuel into the cylinder and the position of the crankshaft at the end of () .
A. intake stroke B. compression stroke C. power stroke D. exhaust stroke 6, diesel engine (), the piston moves from bottom dead center to top dead center, into the exhaust valve closed, the cylinder volume decreases, Pressure reaches 30 to 50 atmospheres, the temperature reached 800 ~ 1000