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.

[单选题]In the four-stroke engine, it takes （） to make one power stroke.A . one propulsionB . two propulsionsC . two revolutionsD . one revolutio

[单选题]On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.A . thrust blockB . sounding rodC . connecting rodD . push rod

[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 a four-stroke engine the camshaft rotates at （）.A . half the engine speedB . twice the engine speedC . the engine speedD . four times the engine speed

[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]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

[单选题]In a four-stroke/cycle diesel engine, the camshaft rotates at （）A . twice the crankshaft speedB . half the crankshaft speedC . the same speed as that of the crankshaftD . a speed independent of that of the crankshaft

[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]At least （） cylinders in four-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position.A . 6B . 2C . 12D . 8