The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.

A、whenever

B、however

C、wherever

D、whether

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更多“The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.”相关的问题

第1题

[单选题] Which of the following statements concerning the water tube and fire tube boilers is not true?（）

A、natural circulation of the water in the water tube boiler is better than that in the fire tube boiler B、for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler C、the water tube boiler will cost shorter time for steam raising D、the water tube boiler require lower skill in operating and maintaining

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第2题

[单选题] （） should be tested and adjusted when the boiler survey is carried out.

A、The boiler oil tank B、The steam pipe C、The fire side D、The safety valves

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第3题

[单选题] If in doubt as to the true water level when a boiler is being oil-fired, you should （）.

A、take no measures B、extinguish the fire as soon as possible C、feed water to the boiler D、open the blow down valve

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第4题

[单选题] Diesel engine waste heat boiler construction is usually of the fire-tube or（）

A、cyclone furnace boiler type B、dry back boiler type C、water-tube type D、critical circulation boiler type

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第5题

[] In the event of a flame failure in an auxiliary water-tube boiler, you must（）

A、A.relight the boiler immediately to prevent loss of steam pressure B、B.relight the fire off the brickwork as the bricks are cherry red C、C.purge the furnace of any combustible gases before attempting to relight the fire D、D.speed up the feed pump to prevent dry firing when the burner flame is reestablished

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第6题

[单选题] Fusible plugs are installed in fire-tube boilers to （）.

A、provide a means of draining the boiler B、warn the engineer of low water level C、cool the crown sheet at high firing rates D、open the burners electrical firing circuits

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第7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8题

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

A、firing for extended periods in the low fire mode B、overheating, due to waterside deposits C、varying the water level above the crown sheet D、carrying excessive alkalinity in the boiler water

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第9题

[单选题] In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.

A、water-tube B、fire-tube C、exhaust gas D、None of the above is true

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第10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 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、A.（1） B、B.（1）and（2） C、C.（2） D、D.neither（1）nor（2）

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