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【单选题】

A firebox explosion in an automatically fired auxiliary boiler may be the result of （）

A、excessive purging before lighting off

B、insufficient trail for ignition period

C、a faulty transformer in the ignition circuit

D、insufficient purging before lighting off

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更多“A firebox explosion in an automatically fired auxiliary boiler may be the result of （）”相关的问题
第1题
[单选题] With regards to a diesel engine crankcase explosion, the most violent is the（） (1) primary explosion (2) secondary explosion

A、(1) only  B、(2) only  C、both (1) and (2)  D、neither (1) or (2)  

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第2题
[单选题] If a cargo of kerosene were considered too lean to explode，then it must be（）.

A、above the explosive range  B、within the explosive range  C、below the explosive range  D、None of the above  

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第3题
[单选题] If a cargo of kerosene were considered too lean to explode, then it must be（）.

A、above the explosive range  B、within the explosive range  C、below the explosive range  D、None of the above  

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第4题
[单选题] The brickwork surrounding the firebox of a boiler is known as（）.

A、refractory  B、the screen wall  C、the water wall  D、fire plate  

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第5题
[单选题] Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.

A、flash point  B、upper explosive limit  C、lower explosive limit  D、fire point  

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第6题
[单选题] The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.

A、auto-ignition point  B、flash point  C、lower explosive limit (LEL)  D、threshold limit value (TLV)  

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第7题
[单选题] The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the（）.

A、flash point  B、fire point  C、upper explosive limit  D、lower explosive limit  

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第8题
[单选题] The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the （）

A、flash point  B、fire point  C、upper explosive limit  D、lower explosive limit  

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第9题
[] Which space(s) on your cargo vessel must have a fire detection system?（）

A、A.Any compartment containing explosives  B、B.Any compartment adjacent to one containing explosives  C、C.Enclosed spaces which are specially suitable for vehicles  D、D.All of the above  

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