Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Steam Plants (Boilers & Turbines) (Set 16)
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Question 1 of 30
A furnace wall in which there are open spaces around the brick as a result of firebrick shrinkage, is __________.
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30 MCQs #1 A furnace wall in which there are open spaces around the brick as a result of firebrick shrinkage, is __________. #2 Which of the listed refractory materials should be used for patching a burner front formed of plastic, castable, or tile? #3 After patching refractory with plastic firebrick, holes are poked in the patch on 1 1/2 inch centers in order to __________. #4 To assure a long service life for boiler refractory materials after installation, the most effective method is to __________. #5 When installed, the economizer relief valve should always be set __________. #6 When water washing a boiler, the proper sequence for washing the sections should be the __________. #7 Which of the listed mediums should be used when water washing a boiler? #8 According to the data given in the illustration, which of the following would be the physical state of the fluid at a gage vacuum of 25.03 inches Hg, and 126.08 degrees Fahrenheit? Illustration SG-0026 #9 If the saturation pressure of water is increased, the relative values shown on the illustrated graph of SG-0001 will change. According to pertinent information found in the steam tables of SG-0004, this will result in __________. Illustration SG-0001 and SG-0004 #10 Which of the following statements is true concerning the information tabulated in the table? Illustration SG-0004 #11 According to the data given in illustration, which of the following would be the physical state of the fluid at a gage vacuum of 28.09 inches Hg, and 117.99 degrees Fahrenheit? Illustration SG-0026 #12 If a boiler generates saturated steam at 125.3 psig, how much heat is required to change the water into steam if the feed water temperature is 240°F? SG-0004 #13 What physical changes will occur to the steam within a boiler that has been properly bottled up when additional heat is applied? #14 The major heat loss in an oil fired boiler is the heat __________. #15 A lower than normal boiler stack gas temperature usually indicates __________. #16 A high carbon monoxide content in the flue gases of a boiler indicates __________. #17 When the rate of heat transfer through tube walls is so reduced that the metal becomes overheated, which of the following conditions will result in the boiler? #18 Cratering and water tracking in boiler tubes is caused by __________. #19 The formation of a pit in the surface of a boiler tube is most likely to occur when __________. #20 In a water-tube boiler, waterside scale formation is caused by __________. #21 Blisters developing on boiler tubes can be caused by __________. #22 Waterside abrasion of boiler tubes can be caused by __________. #23 Fireside burning of boiler tubes is usually the direct result of __________. #24 Boiler tube failures can result from __________. #25 Warping of superheater screen tubes can be caused by __________. #26 An excessively high superheater temperature could be the result of __________. #27 When operating under constant load, the superheated steam temperature may rise above normal if the __________. #28 Under normal operating conditions, a drop in the steam temperature leaving an uncontrolled interdeck superheater could be caused by a __________. #29 Insufficient combustion air supply to the furnace would cause __________. #30 Dirty generating tube surfaces may cause higher than normal superheater outlet temperatures because __________.
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