A.prevent governor surging at shutdown
B.make sure the fuel nozzles are flushed clean
C.prevent pressure buildup in the fuel lines
D.prevent damage from localized overheating
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A.stop the combustion air supply
B.engage the jacking gear
C.secure the lube oil pump
D.shut off the fuel at the day tank
A.They conduct heat poorly
B.They are expensive
C.They cannot be replaced
D.They require special tools for removal
A.The diesel oil must never be allowed to mix with the heavy fuel
B.The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve
C.The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve
D.The heating steam must be secured before the diesel oil passes through the three-way valve
A.To prevent internal damage form local overheating
B.To ensure the fuel nozzles are flushed clean
C.To clear the smoke stack
D.To let the waste heat boiler reduce its rate of steam generation
A.loss of power
B.misfiring
C.low fuel oil pressure
D.All of the above
最新試題
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