E．ngine operating conditions may be indicated by the color of the exhaust smoke Black smoke could indicate .

A．an insufficient speed droop setting

B．an overloaded engine

C．clogged drain holes in the oil control rings

D．complete combustion

[单选题]Operating conditions in the crank chamber are very （） those in the cylinder.A . the same asB . similar toC . separated fromD . different from

[单选题]The trouble-free life of an engine indicates （）.A . the period of time during which no trouble occurs to the engineB . no trouble will occur to the engine all its lifeC . trouble may occur freely to the engineD . no matter what you do to the engine,

[单选题]In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?A．Noise coming from that air starting valveB．Continuous operation of the starting air compressorC．Zero air pressure in the air starting

[单选题]A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.A . reduce the engine loadB . increase the cooling water flowC . increase the lube oil pressureD . adjust the fuel

[单选题]Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause （）.A . the formation of sulfuric acidB . a decrease in lube oil viscosityC . a decrease in co

[名词解释] 运行限值和条件 operating limits and conditions

[单选题]Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?（）A . Poor combustionB . High cylinder oil consumptionC . Leaking exhaust valvesD . All of the above

[单选题]Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）A . Injection pressuresB . Control air supply pressureC . Cooling water flow through after-coolersD . Lube oil t

[单选题]In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.A . metal particles loosened by wearB . air when no air cleaners are usedC . condensation of water vaporsD . breakdown of th

[单选题]A diesel engine may be hard to start if the （）A . air intake is restrictedB . engine is cranked too fastC . vibration dampener is faultyD . exhaust back pressure is low