Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG Steam Plants (Boilers & Turbines) (Set 22)

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Question 1 of 30

The rate of fouling on the oil side of a fuel oil heater is inversely related to the __________.

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30 MCQs

#1 The rate of fouling on the oil side of a fuel oil heater is inversely related to the __________. #2 If oil is found in the main fuel oil heater steam drain system, which of the actions listed should be taken first? #3 A boiler with a water capacity of 10 tons, generates steam at the rate of 30 tons per hour. If the feed water quality is 0.5 ppm, the concentration of solids will increase 1.5 ppm every hour. What would be the increase in the concentration of solids within 24 hours? #4 Testing boiler water for chloride content will indicate the amount of __________. #5 A sample of boiler water can be chemically tested for alkalinity by initially adding a few drops of phenolphthalein and then slowly titrating the water sample until the __________. #6 Phenolphthalein is used as an indicator to test boiler water for __________. #7 A dissolved oxygen concentration of 8.0 ppm represents __________. #8 Calcium minerals in boiler water are precipitated out of solution by the use of which of the listed chemicals? #9 Although accurate tests of boiler water for dissolved oxygen are difficult to obtain on board ship, you can be fairly certain of proper oxygen removal by __________. #10 When a boiler water test indicates a pH value of 6, you should __________. #11 To minimize metal corrosion, boiler water is best kept __________. #12 If boiler water chemicals are decreasing in one boiler and increasing in the other boiler, while both are steaming at normal rates, a leak probably exists in the __________. #13 Carbon dioxide dissolved in boiler water is dangerous in a modern power boiler because the gas __________. #14 Excessive alkalinity of boiler water will cause ________. #15 Excessive carbon dioxide formed by improper chemical treatment in the boiler may cause corrosion in the __________. #16 A malfunction in the DC heater is indicated by __________. #17 Flame scanners are used with boiler combustion control systems to monitor flame quality and to __________. #18 The photoelectric cell installed as part of the combustion safety controls of an automatically fired boiler will __________. #19 Which of the following represents a significant system limitation to be aware of when a burner management system is operated in the 'HAND' mode? #20 In automatic combustion control systems, increasing or decreasing a loading pressure by a set amount is called __________. #21 As found in a basic pneumatic automatic combustion control system, the function of a standardizing relay is to __________. #22 In an automatically fired boiler, the steam pressure regulator controls the supply of fuel oil to the burners by responding to variations in the __________. #23 Fine adjustments to a boiler combustion control system, to bring about near perfect combustion, should be made by manually adjusting the __________. #24 If an automatically fired burner ignites, but repeatedly goes out within two seconds, the cause could be a/an __________. #25 Modern day boiler automation allows bypassing the "flame safeguard" system to permit a burner to have a "trial for ignition" period during burner light-off. This period may not exceed ______. #26 In a boiler automation system, if a burner fuel oil solenoid valve continually trips closed under normal steaming conditions, you should __________. #27 While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler? #28 While trying to light off a burner on a semi-automated boiler, you note that the fuel oil solenoid valve at the burner will not stay open. Which of the following conditions could cause this problem? #29 If it should become necessary to abandon a compartment because of the danger of a large steam leak on a boiler, which of the following actions represents the best avenue of escape? #30 Which of the precautions listed should be taken when gagging a boiler safety valve?

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