For an ordinary modem marine four-stroke engine the inlet valves close （）.

[单选题]For an ordinary four-stroke diesel engine the exhaust valves close （）.A . after TDCB . before TDCC . after BDCD . before BDC

[单选题]For an ordinary four-stroke engine the inlet valves open （）A . after TDCB . before TDCC . after BDCD . before BDC

[单选题]In an ordinary four-stroke engine the exhaust valves open （）A . after TDCB . before TDCC . after BDCD . before BDC

[单选题]For an ordinary four-stroke engine the exhaust valves open （）.A . after TDCB . before TDCC . after BDCD . before BDC

[单选题]Marine four-stroke diesel engines are mainly （）.A . of crosshead typeB . of trunk piston typeC . of low speed typeD . all the above

[单选题]With four-stroke engines, it takes four revolutions of the crank shaft to make （） power stroke(s).A . 1B . 2C . 4D . 8

[单选题]The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.A . alternatorB . turbo-chargerC . remote controllerD . windla

[单选题]If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.A . cylinder compression pressure may not be high enoughB . cylinder compression temperature may be too highC . fuel oil injec

[单选题]The camshaft on a four-stroke/cycle diesel engine provides a means to operate the （）.A . fuel injectorsB . exhaust valvesC . intake valvesD . all of the above

[单选题]If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.A . 525 RPMB . 775 RPMC . 1550 RPMD . 1800 RPM