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单选题
The purpose of the safety relief valves installed on an auxiliary boiler is to （）.
A
relieve excess fuel oil pressure during the “off” fire cycle
B
admit water to the dry pipe
C
throttle the forced draft fan output for proper combustion
D
reduce excess steam pressure in the boiler
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Maintaining constant velocity in cargo linesC
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单选题Cargo pump relief valves are piped to the（）.A
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考题
单选题The safety valves should be tested and adjusted when the boiler survey is （）A
completedB
carried outC
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考题
单选题The purpose of the safety relief valves installed on an auxiliary boiler is to （）.A
relieve excess fuel oil pressure during the “off” fire cycleB
admit water to the dry pipeC
throttle the forced draft fan output for proper combustionD
reduce excess steam pressure in the boiler
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单选题The safety valves are mounted in pairs to （） the boiler against overpressure.A
useB
releaseC
protectD
effect
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单选题Blow-off of the relief valves of the main cylinders during operation indicates （）.A
the cylinder cover is crackedB
the injector holes is cloggedC
the cams are not properly setD
fuel pump is leaking
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单选题Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）A
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Excessive fuel injectionC
Very late injection timingD
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单选题What is the purpose of a relief valve?（）A
to fill 2 tanks at the same timeB
to use pump at a higher pressureC
to return liquid to suction side if discharge valve is closedD
All of the above are true
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improveC
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