Millwright Level 4 Turbines Exam Questions With Verified Answers 2024/2025

Millwright Level 4 Turbines Exam Questions With Verified Answers 2024/2025 Carbon rings are used to seal the steam within the casing of steam turbines. why is this method effective on impulse type steam turbines? A. low casing pressure B. minimal maintenance C. high shaft surface speeds D. corrosion resistance A. low casing pressure Transpiration is a process of using __________ to cool the turbine blades A. super heated steam B. a watery steam vapor C. a refrigerant D. a water glycol a watery steam vapor The introduction of the steam to the first set of moving blades is provided from the A. diaphragm B. nozzle blocks C. governor D. sentinel valve B. nozzle blocks The sentinel valve on the steam turbine performs which function? A. shuts down the generator B. assists the governor in speed control C. indicates high casing pressures D. monitors lubricating oil pressure indicates high casing pressures Before overhauling and pressure venting a compressor to atmosphere, what is the most important thing to know? A. what is the direction of shaft rotation B. what type of gas medium was in the compressor C. are the spare parts in stock D. the time needed for the overhaul B. what type of gas medium was in the compressor When a toxic gas like H2S is being used in a compressor and you are doing and overhaul, what should you be aware of? A. porosity in the bearing journal surfaces B. that the corrosive properties of the gas could damage seals C. the oxidizing of the Babbitt bearing surfaces D. after purging the compressor check for trapped gas inside the hollow piston D. after purging the compressor check for trapped gas inside the hollow piston Insulation is fitted on many turbine components. the purpose of this is to A. dampen sound B. minimize heat loss C. reduce the amount of personal protective equipment required D. prevent fires from starting B. minimize heat loss Which component of the steam turbine is exposed to the greatest temperatures and pressures A. impulse blading B. stationary diaphragm nozzels C. steam chest D. governor control C. steam chest The most common cause of vibration is A. looseness B. bad journals C. unbalance D. bad gears C. unbalance Inlet guide vanes perform what function on a gas turbine system A. straighten the airflow into the first stage B. vary the inlet airflow into the first stage