单项选择题
In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.
A.reciprocating at the piston pin, rotary at the crank pin
B.reciprocating at the crank pin, rotary at the piston pin
C.straight reciprocation
D.straight rotation
相关考题
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单项选择题
Immediately after any diesel engine is started, the engineer should check the （）
A.crankcase pressure
B.lube oil pressure
C.saltwater pressure
D.exhaust temperature -
单项选择题
The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
A.operating the boiler at less than normal water level
B.installing fins on the firesides of water-tubes
C.increasing the amount of excess air to the burners
D.treating the boiler water with chemical oxygen scavengers -
单项选择题
The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as （）.
A.delivering the same quantity of fuel to each cylinder for each power stroke according to engine load
B.maintaining the metering adjustment for a reasonable period under all load conditions
C.timing fuel injection to obtain maximum power and good fuel economy
D.distributing the fuel to all parts of the combustion chamber for proper combustion
