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

USCG Steam Plants (Boilers & Turbines) (Set 9)

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Question 1 of 30

When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to __________.

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30 MCQs

#1 When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to __________. #2 The labyrinth seals used on rotating steam turbine shafts reduces external leakage by causing __________. #3 Labyrinth packing rings are installed on turbine diaphragms to minimize __________. #4 Where are moisture shields located in a main propulsion steam turbine? #5 The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the _______. #6 The jacking gear on main propulsion turbines can be used to __________. #7 The main propulsion shaft turning gear usually connects to the free end of the high-speed high pressure pinion because the __________. #8 Which of the devices listed is generally used to engage the main engine turning gear to the high pressure turbine high-speed pinion? #9 The main propulsion turbine should be operated with the __________. #10 Operating a steam turbine propulsion unit at medium speed, in an area with extremely cold seawater and the main circulating pump providing full cooling water flow to the condenser will result in __________. #11 During normal operation of a main propulsion turbine, the lube oil supply temperature to the bearings should be maintained at approximately __________. #12 Before placing the jacking gear in operation on a main turbine unit, you must always insure that __________. #13 The most critical period of main turbine operation is during cold start-up, rather than hot shutdown because __________. #14 Prior to rolling the main turbines in preparation for getting underway, you should __________. #15 Which of the listed procedures should be followed when raising vacuum on the main propulsion plant prior to getting underway? #16 After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the ________. #17 When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the __________. #18 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 __________. #19 To stop the rotor of a main turbine while underway at sea you should __________. #20 The jacking gear must be engaged as quickly as possible when securing the Main Turbines in order to __________. #21 To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged? #22 When securing a main propulsion turbine equipped with carbon packing glands, the vacuum should always be broken before securing the gland seal steam because __________. #23 In securing the main turbines, steam to the second stage air ejectors should be left on for a short period of time in order to __________. #24 The FIRST step in breaking vacuum on a main turbine unit should be to __________. #25 A common cause of the Babbitt linings cracking in a turbine journal bearing is from ________. #26 Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by __________. #27 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 __________. #28 The main propulsion turbine can be damaged by __________. #29 An overheated bearing in the main propulsion unit is indicated by __________. #30 Most auxiliary turbines do not require an external source of gland sealing steam because they __________.

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