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

USCG Steam Plants (Boilers & Turbines) (Set 10)

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Question 1 of 30

Turbine throttling losses can best be described as a loss of energy occurring __________.

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30 MCQs

#1 Turbine throttling losses can best be described as a loss of energy occurring __________. #2 The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________. #3 An excess pressure governor is a special type of control device which would normally be found on a __________. #4 Carbon ring packing segments are secured in a shaft gland assembly of a steam turbine by means of __________. #5 Packing rings installed on auxiliary turbines are generally lubricated by __________. #6 Which type of packing is primarily utilized to control steam leakage from the casing of a modern auxiliary turbine? #7 When fitting new carbon ring packing on a turbine rotor shaft, carefully filing the ends of the segments will ______. #8 To test an automatic low lube oil pressure trip on an idling turbo generator and at the same time prevent the chance of bearing damage, you should __________. #9 The turbine of a turbo-electric drive should be secured by __________. #10 An auxiliary turbine boiler feed pump should normally be stopped by __________. #11 A steam driven 750 KW turbo generator has a rated speed of 1200 RPM. The over speed setting for this unit must not exceed __________. #12 In any governor there is a small range of speed in which no corrective action occurs. This speed range is called the governor dead band and is caused by __________. #13 Rotating flyweights, acting against a spring force, will provide a simple type of __________. #14 A constant speed hydraulic governor would more than likely be installed on a __________. #15 Which of the following statements describes how the main propulsion turbine over speed relay initiates closing of the throttle valve? #16 When starting a turbo generator, you must provide lube oil pressure to the governor power piston by means of __________. #17 Which of the listed parts illustrated in the turbo generator governing system, provides the follow-up to prevent the nozzle valves from cycling between the fully open and fully closed positions, with each variation in turbine speed? Illustration SE-0009 #18 If two turbo-generators with the same no-load speed settings are operating in parallel, the unit whose governor has the lesser speed droop will __________. #19 Which of the listed actions will occur when there is an increase in load on a ship service generator equipped with a centrifugal type hydraulic governor? Illustration SE-0009 #20 A pilot valve and servomotor are utilized in mechanical-hydraulic governing systems on a turbo generator unit in order to __________. #21 A back pressure trip on a ship's service turbo-generator functions to trip the turbine under what circumstance? #22 The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________. #23 An excess pressure governor would normally be used on a __________. #24 The constant pressure governor of a turbine-driven feed pump maintains which of the following pressures at a constant value for all capacities? #25 In addition to causing erosion of turbine blades, slugs of water in the steam supply to a turbine driven pump can result in __________. #26 A turbo generator back pressure trip can be actuated as a result of __________. #27 The main throttle valve on a main propulsion turbine admits steam directly into the __________. #28 In the illustration of a typical ship service turbo generator control system, the handle labeled "B" is used to _______________. Illustration SE-0009 #29 Which of the following statements concerning the design of balanced throttle valves is correct? #30 A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles?

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