Millwright Level 4 Turbines Exam Questions
With Verified Answers Graded A+ 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
C. prevent compressor surge
D. provide separate secondary air flow
A. straighten the airflow into the first stage
A mechanical governor uses _____________ to operate the governor valve
A. a steel bar
B. fly weight balls
C. axial thrust
D. revolutions per minute
B. fly weight balls
A gear having 24 teeth rotates at 200 rpm. Vibration analysis indicates a vibration at 1x RPM of the
gear. what is the likely gear fault?
A. backlash
B. axial misalignment
C. broken tooth
D. all items listed
C. broken tooth
On start up, before steam is admitted into the turbine, what position do the flyweight balls have
A. they are held in close to the shaft
B. they are held out farthest from the shaft
C. they are half way between two extreme positions
D. they could be floating anywhere between the two extreme positions
A. they are held in close to the shaft
What is the most common type of imbalance
A. static Imbalance
B. couple imbalance
With Verified Answers Graded A+ 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
C. prevent compressor surge
D. provide separate secondary air flow
A. straighten the airflow into the first stage
A mechanical governor uses _____________ to operate the governor valve
A. a steel bar
B. fly weight balls
C. axial thrust
D. revolutions per minute
B. fly weight balls
A gear having 24 teeth rotates at 200 rpm. Vibration analysis indicates a vibration at 1x RPM of the
gear. what is the likely gear fault?
A. backlash
B. axial misalignment
C. broken tooth
D. all items listed
C. broken tooth
On start up, before steam is admitted into the turbine, what position do the flyweight balls have
A. they are held in close to the shaft
B. they are held out farthest from the shaft
C. they are half way between two extreme positions
D. they could be floating anywhere between the two extreme positions
A. they are held in close to the shaft
What is the most common type of imbalance
A. static Imbalance
B. couple imbalance
