Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Steam Plants (Boilers & Turbines) (Set 25)
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Question 1 of 30
Before placing the jacking gear in operation on a main turbine unit, you must always insure that __________.
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30 MCQs #1 Before placing the jacking gear in operation on a main turbine unit, you must always insure that __________. #2 Prior to rolling the main turbines in preparation for getting underway, you should __________. #3 After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the ________. #4 When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the __________. #5 With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________. #6 To stop the rotor of a main turbine while underway at sea you should __________. #7 To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged? #8 A common cause of the Babbitt linings cracking in a turbine journal bearing is from ________. #9 If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur? #10 Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by __________. #11 Raising vacuum on a main turbine unit without using the turning gear will result in __________. #12 The original bridge gage reading for a reduction gear bearing was measured as .008 inches. A year later, the bridge gage reading for the same bearing is .010 inches. This indicates __________. #13 If the main propulsion turbine begins to vibrate severely while you are increasing speed, you should __________. #14 The main propulsion turbine can be damaged by __________. #15 An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by __________. #16 An overheated bearing in the main propulsion unit is indicated by __________. #17 When a turbine bearing shows signs of overheating, you should __________. #18 The turbine of a turbo-electric drive should be secured by __________. #19 An auxiliary turbine boiler feed pump should normally be stopped by __________. #20 The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________. #21 Most auxiliary turbine feed pumps do not require an external source of gland sealing steam because they __________. #22 Packing rings installed on auxiliary turbines are generally lubricated by __________. #23 Which of the following statements describes how the main propulsion turbine over speed relay initiates closing of the throttle valve? #24 When starting a turbo generator, you must provide lube oil pressure to the governor power piston by means of __________. #25 A back pressure trip on a ship's service turbo-generator functions to trip the turbine under what circumstance? #26 A pilot valve and servomotor are utilized in mechanical-hydraulic governing systems on a turbo generator unit in order to __________. #27 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 #28 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 #29 The over speed tripping device installed on an auxiliary turbine is automatically actuated by __________. #30 An excess pressure governor would normally be used on a __________.
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