Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.

A、not good

B、good

C、better

D、the best

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更多“Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.”相关的问题

第1题

[单选题] Sweating of the refrigeration system compressor crankcase is caused by （）.

A、too much superheat B、insufficient superheat C、suction pressure too low D、excessive refrigerant returning to the compressor

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第2题

[单选题] They have done（）work these days.

A、too much B、much too C、too many D、many too

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第3题

[单选题] Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the （）.

A、air charge density becoming too high B、piston crown surfaces becoming too cold C、formation of excessive quantities of condensate D、compression pressure being greatly reduced

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第4题

[单选题] Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? （） (1) too little cooling water (2) too much cooling water (3) too warm cooler water

A、（1）only B、anyof（1），（2）and（3） C、anyof（1）and（3） D、anyof（1）and（2）

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第5题

[单选题] Excessively warm water leaving condenser may be caused by（）

A、fouled tubes in shell and tube condenser B、too little or too warm condenser water C、air or non-condensable gas in system D、overcharge of refrigerant

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第6题

[单选题] As for a oil-fired boiler too much air would indicated by （）.

A、yellowish flame B、golden yellow flame C、milky flame D、brilliant white flame

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第7题

[单选题] The rising of the exhaust temperature in manifold pipe may NOT result from （）.

A、too great a loading B、fouled turbocharger C、bad combustion D、excessive air

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第8题

[单选题] Too much air in the furnace of an oil-fired boiler would be indicated by （）.

A、yellowish flame B、golden yellow flame C、white flame D、brilliant white flame