A distorted furnace in a fire-tube auxiliary boiler may be the result of （）

[单选题]Waterside scale in a fire-tube boiler may cause （）.A . increased heat transferB . fireside erosionC . high steam demandD . overheated tube

[单选题]Fusible plugs are installed in fire-tube boilers to （）.A . provide a means of draining the boilerB . warn the engineer of low water levelC . cool the crown sheet at high firing ratesD . open the burners electrical firing circuit

[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]When an auxiliary boiler is panting and emitting black smoke, you should （）.A . increase the fuel oil temperatureB . decrease the fuel oil temperatureC . decrease the fuel oil supply pressureD . increase the air supply

[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]In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A . The safety valve escape piping should be disconnected from the valve

Burner ignition failure in an automatically fired auxiliary boiler would be caus