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单选题
As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressure
A
（1）
B
（1）and（2）
C
（2）
D
neither（1）nor（2）
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单选题Too much air in the furnace of an oil-fired boiler would be indicated by （）.A
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单选题Care must be taken to condition the （）in the boiler to prevent scaling, and corrosion, which can weaken the pressure vessel.A
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单选题The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.A
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单选题Which one is not the normal operation for boiler shutdown?（）A
Carry out soot blowing if permissibleB
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单选题At normal sea going, we use （） instead of donkey boiler.A
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单选题As for a oil-fired boiler too much air would indicated by （）.A
yellowish flameB
golden yellow flameC
milky flameD
brilliant white flame
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