When an auxiliary boiler is panting and emitting black smoke, you should （）.

[单选题]The water in an auxiliary boiler should be tested for chloride content to determine ( ).A．total dissolved solidsB．salt contaminationC．water harcnessD．chlorine contamination

[单选题]The water in an auxiliary boiler should be tested for chloride content to determine （）.A . total dissolved solidsB . salt contaminationC . water hardnessD . chlorine contaminatio

[单选题]If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.A . high steam pressure in the boilerB . abnormally high feed water temperatureC . abnormally high boiler water temperatureD . steam demand exc

[单选题]In an auxiliary boiler steam and water system, the highest pressure will be in the （）.A . steam stop valveB . dry pipeC . feedwater systemD . generating tube

[单选题]Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.A . 10B . 7C . 4D . 1

[单选题]H．ow to operate boiler?

[单选题]The procedures recommended for auxiliary boilers having high salinity include （）.A . treating with oxygen scavengersB . securing the boiler and giving it a blowing downC . increasing the pHD . reducing the phosphate level

[单选题]The water level showing in a boiler water gauge glass is usually ( ) duringworking.A．higher than the actual drum water levelB．equal to the actual drum water levelC．increasing due to steam condensation in the glassD．lower than actual drum wafer level

[单选题]The auxiliary engine and a cgenerator can be connected with （）.A . camB . crossheadC . bulgeD . coupling

[单选题]Auxiliary boilers are divided into several classifications, one of which is （）.A . water-tube supercritical circulationB . water-tube forced circulationC . fire-tube controlled circulationD . fire-tube express circulatio