Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Steam Plants (Boilers & Turbines) (Set 8)
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Question 1 of 30
A pressure drop occurs across both the moving and fixed blades of a reaction turbine as a result of the __________.
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30 MCQs #1 A pressure drop occurs across both the moving and fixed blades of a reaction turbine as a result of the __________. #2 Which of the parts listed for a reaction turbine serve the same function as the nozzles of an impulse turbine? #3 Why do double flow reaction turbines produce very little axial thrust? #4 What happens to the steam as it moves across the moving blades in a reaction turbine? #5 The general method of reducing turbine reaction blade vibration is by the use of _______. #6 Large temperature and pressure drops which occur in the first stage of a combination impulse and reaction turbine are caused by steam passing through __________. #7 Concerning the classification of steam turbines, a cross compound designed unit __________. #8 In a cross-compounded turbine propulsion plant, steam enters the __________. #9 Why is superheated steam used in the main propulsion turbines instead of saturated steam? #10 What is generally found at the end of the low pressure turbine rotor of a cross-compound turbine arrangement? #11 As steam accomplishes work in an engine or turbine, the pressure of the steam is reduced because it __________. #12 When a turbine is in operation, a rotor position micrometer is used to determine any change in rotor __________. #13 A turbine assembly in which steam flows in series through a high pressure turbine and then on to a low pressure turbine, with both turbines driving a common reduction gear through separate shafts, is classified as _________. #14 As steam first enters the main propulsion turbine, which of the following energy conversions takes place? #15 For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________. #16 Journal bearings used with modern turbine rotors are manufactured in two halves in order to __________. #17 Which of the journal bearings listed most easily accommodates the minor turbine shaft misalignment? #18 The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these rings is to __________. #19 The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine __________. #20 On a main propulsion turbine bearing, the readings obtained with a bridge gage represent the __________. #21 Main steam turbine bearings are lined with __________. #22 For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________. #23 An efficient seal is normally obtained between the upper and lower halves of a turbine casing by __________. #24 Turbine casing flanges are sometimes provided with a system of joint grooving to __________. #25 Allowance for axial expansion of the steam turbine due to temperature changes is provided for by the use of __________. #26 Which of the devices listed is found on an LP main propulsion steam turbine casing? #27 The purpose of the sentinel valve installed on a turbine casing is to __________. #28 The astern element of a main propulsion turbine is usually designed as a/an __________. #29 Which of the following statements is true concerning the turbine shown in the illustration? Illustration SE-0016 #30 Labyrinth seals used to reduce leakage around a turbine shaft are constructed of __________.
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