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

USCG Steam Plants (Boilers & Turbines) (Set 17)

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Question 1 of 30

Which of the following would indicate a moderate leak in the desuperheater?

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30 MCQs

#1 Which of the following would indicate a moderate leak in the desuperheater? #2 Which of the conditions listed could cause a boiler economizer to leak? #3 Which of the conditions listed would indicate excessive soot buildup on the economizer? #4 Slag buildup on boiler furnace refractory is undesirable because it causes __________. #5 Which of the following conditions is indicated by an external bulge or bowed area of the boiler furnace wall? #6 Which of the following problems can occur when an excessive number of water screen tubes are plugged? #7 Which of the conditions listed occurs when glassy slag, formed by the burning of fuel oil contaminated with salt water, melts and runs over the furnace wall? #8 Excessive foaming in a steaming boiler can cause damage to the __________. #9 In a boiler equipped with an automatic feed water regulator, erratic variations in the water level could be caused by __________. #10 Rapid fluctuation in the superheater temperature of a steady steaming boiler indicates __________. #11 Oil accumulation in boiler water would __________. #12 High boiler water level can cause carryover and __________. #13 Large steam drums are not required in the design of a coil-type auxiliary water-tube boiler because __________. #14 The gage glass on a coil-type auxiliary boiler is connected to the __________. #15 Bottom blow valves are installed on auxiliary water-tube boilers to __________. #16 The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________. #17 The purpose of try-cocks used on an auxiliary boiler is to __________. #18 The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________. #19 The tube sheets installed in a fire-tube auxiliary boiler are normally connected by __________. #20 Which of the following statements concerning fire-tube boilers is correct? #21 The boiler shown in the illustration would be classed as __________. MO-0064 #22 Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown sheet? #23 Fusible plugs are installed in fire-tube boilers to __________. #24 Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are __________. #25 The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent __________. #26 A photoelectric cell installed in an automatically fired auxiliary boiler burner management system __________. #27 During unsafe firing conditions in a large automatic auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as __________. #28 Which of the listed sequence of events occurs when an automatic auxiliary boiler is prepurged? #29 The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and __________. #30 Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained?

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