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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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单选题In the event of a flame failure in an auxiliary water-tube boiler, you must（）A
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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 modeB
overheating, due to waterside depositsC
varying the water level above the crown sheetD
carrying excessive alkalinity in the boiler water
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单选题Diesel engine waste heat boiler construction is usually of the fire-tube or（）A
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单选题Combustible material stored in a compartment adjacent to a compartment where there is a fire may be ignitedThis ignition can occur by （）.A
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单选题A dazzling white burner flame in the boiler furnace indicates （）.A
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单选题The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）A
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单选题In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.A
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单选题Fins are installed on the fireside of water-tubes used in waste boiler to（）A
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单选题Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）A
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None
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单选题In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.A
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单选题Impurities from the boiler water surface can be removed through the （）.A
safety valveB
blow down valveC
scum valveD
feed check valve
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单选题When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and （） the sea water passing through the tubes.A
disposeB
dissolveC
heatD
dissipates
考题
单选题When steam is being raised on a boiler, the water level will normally （）.A
drop as the boiler warms upB
rise as the boiler warms upC
remain unchanged until the boiler is hot enoughD
rise and fall with the steam demand
考题
单选题One of the main purposes of refractories in a boiler furnace is to（）A
help preheat the air for the furnacesB
help preheat the feedwaterC
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单选题The furnace of an oil fired boiler should be （） before the operating burner is lit.A
filled with waterB
purgedC
cleared of airD
None of the above is true
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单选题You are designing a strategy to allow users to gain VPN access to the internal network. What should you do？（）A
Allow all inbound VPN traffic to pass through the internal firewall and the perimeter firewall.B
Allow all inbound VPN traffic to pass through the perimeter firewall only.C
Allow all VPN traffic from the source IP address of 131.107.1.14 to pass through the internal firewall.D
Allow all VPN traffic from the source IP address of 191.168.1.0/24 to pass through the perimeter firewall.
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单选题In a （） boiler the water flows through the inside of the tubes while the hot gases pass around the outside.A
water-tubeB
fire-tubeC
exhaust gasD
none of the above
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单选题A dazzling white burner flame in the boiler furnace indicates （）.A
no combustionB
deposits in the fuelC
excessive air in the fuelD
cold fuel oil
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