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

USCG General Subjects (Auxiliaries & Systems) (Set 16)

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Question 1 of 30

What statement is true concerning a two-pipe hydronic heating system?

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30 MCQs

#1 What statement is true concerning a two-pipe hydronic heating system? #2 It is absolutely essential that hydronic heating system hot water piping be kept free of air. Assuming that a system is initially properly filled with water, what is the primary source of air contamination? #3 Water hammer in a steam heating system can be caused by __________. #4 Which of the following guidelines is considered to reflect good design practices for shipboard steam heating systems? #5 What type of centrifugal fan is characterized by the highest operating efficiency? #6 What type of heating coil is generally preferred in heating spaces with electronic equipment? #7 Concerning cargo-hold dehumidification, what statement is true? #8 Which statement is true concerning a liquid desiccant cargo-hold dehumidification system? #9 What statement is true concerning a liquid desiccant cargo-hold dehumidification system? #10 With regard to the cooling and heating coils and humidification and regeneration chambers of a liquid cargo-hold dehumidification system, which statement is true? #11 What type of HVAC system is ideally designed to serve a large public space? #12 What type of HVAC system is characterized by poor air distribution and ventilation and low system heat loads? #13 What type of HVAC system is characterized by having control dampers in locations other than the outside air supply, outside air exhaust, and recirculation damper applications? #14 What temperature associated with the psychrometric properties of air is measured by an ordinary thermometer? #15 What temperature associated with the psychrometric properties of air is measured with a sling psychrometer? #16 Probably the most useful troubleshooting tools used in a predictive maintenance management program for shipboard machinery are vibration meters, analyzers, and monitors. What is the term that represents the rate of change of the velocity as a result of a part vibrating during its periodic or oscillatory motion? #17 What is the standard unit of measure for vibration displacement? #18 When performing a vibration analysis for rotating machinery, what is essential? #19 If a micrometer were opened to a distance of 0.0001 inch, you would say the reading is __________. #20 One turn of the micrometer barrel will linearly move the spindle __________. #21 To determine the diameter of a small hole, which of the listed tools must be used with inside calipers to get an accurate reading? #22 A reading of 0.625 inch on a micrometer with a 2 to 3 inch range would be equal to __________. #23 If a bolt or stud were to break off flush at the surface, which of the listed actions would probably be the best first step to begin the process of its removal? #24 To measure the circumference of a piece of pipe, you should use a __________. #25 To get an accurate measurement using a 12 inch machinist's steel rule, you should measure __________. #26 With regards to the American National Screw Thread nomenclature, 'pitch' is the __________. #27 Which of the following is true when comparing the different "class of fit" for machine threads on bolts and nuts? #28 As it pertains to the automatic hydraulic brake of a horizontal electro-hydraulic anchor windlass, what statement is true? #29 As it pertains to the automatic electric brake of a horizontal electro-mechanical anchor windlass, what statement is true? #30 In attempting to start the hydraulic pump drive motor of a horizontal electro-hydraulic anchor windlass, what condition would prevent the electric motor from starting?

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