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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A distorted furnace in a fire-tube auxiliary boiler may be the result of （）A
firing for extended periods in the low fire modeB
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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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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
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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
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heatD
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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
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单选题One of the main purposes of refractories in a boiler furnace is to（）A
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单选题The furnace of an oil fired boiler should be （） before the operating burner is lit.A
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None of the above is true
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Allow all inbound VPN traffic to pass through the internal firewall and the perimeter firewall.B
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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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