level 4 Flashcards
how many measurements should be taken to make sure the cylinder is round?
3
where is the most wear on a cylinder?
most of the wear occurs towards the top on the major thrust side
time allowed for for die to dry for magretic partical is called
dewell tine
the most accurate method of checking the bearing clearance but also the most time consuming
measurement
what is used to insolute a turbine
lagging
where is the trust bearing located on a turbine
inlet side
the casing of a steam turbin is called a ?
cylinder
on some turbines you tighten the flange bolts by hydroulically stretching them and turning thenut down, this method does not require heating of ?
the bolts
the foundation of the turbine should be isolatedfrom the other building floors. it should be at least ____times the mass of all the turbines assembly so that it does not move and helps dampen vibrations from the machine
2.5
where are the defusers located in a das turbin
between the compresser and cumbustion chamber
all desiel engiens have to be
artifishely asporated
why are crank shaft filited
to prevent cracking
what is vibration dempeners for
to reduse crank shaft torsional vibration
where do condisat go in a steam turbin
hot well
what pump is used to pump the condisat
condisate boiler feed pump
where is a drive pully on a gravity drop drive
below the head pully
what is the purpose of a S drive
To create enough weight on a chain to keep tension
what are the adventages of fabricated chiar
it can be welded on
a virtica screw conving should have a
(to be more efficient)
half pitch
what is the minimum splice length is
the width of the belt
the frame that supports the rollers also called
the roll case
cement- based grout can be workedon after seven days but reaches its full compressive strength after
28 days
to level a machine surface using a precision level first determine the ratio between the
Surface to be leveled and the length of the precision level
drop in ancher sleeves requires a
setting tool
which anchor bolt is best suited for the edge of a concrate foundation
adhesive
plan view is looking down. elivation view is the ___________
side view to see elivation
oil whirl usually occurs at frequencies of about ____ to _____ of the shaft rotation
45% to 50%
what type of balancing requires a computer
dynamic imbalance
a ____ had a value of 9.8 meters per second or 32 feet per second
G
what is the purpose of lagging on steam turbines
retain heat and protect personnel
what drives a turbo
exhaust gas
what is the blading called in a diaphragm
reaction type blades
which blades do not have a pressure drop
impulse type
how many times do the crankshaft rotate for 1 cycle of a 4-stroke engine
crankshaft turns twice
which pulley do the load travel towards
head pulley
which pulley is usually the driven
head pulley
what is a crown pulleys purpose
helps keep the belt centered
what is a guide rollers purpose
to help direction of of belt stop the belt from hitting steel frame
which zone takes the most wear
the loading point
where do you place impact rollers
inderneath shoots
what kind of takeup dp you use on small flat belts
screw take ups
whats lagging purpose on a tail pulley
to increase the coefficient of friction between belt and pulley
what is ultrasonic testing used for
to find cracks
what should you do to paint before meg particile testing
remove/ grind off
what is used to measure vibration
vibration probe/analyzer
who should sign off a log book
a journeyman
how many measurements need to be taken to ensure cylinder is round
3
where does the most wear occur on a cylinder
the top
the casing of a system turbine is called
cylinder
what light do you use for fluroscence
uv
definition of NDT
non-destructive testing
what is the most important thing then starting up a steam turbine
use jacking oil
where do the condensate go in a turbine
it goes in a hot well
how wide should you have a lap joint on a bucket conveyor
at least one width of the belt
backstop on a bucket convyor
allow it to travel in one direction only
heavy duty chain (H-style)
pintle chain
advantage of hot vulcanize
strongest belt join
hydraulic stretch how would you tighten the flange bolts on a turbine
by hand tightening bolt
what is the purpose of fillets on a crankshaft
to avoid stress areas on the crank
what is the purpose of a vibration dampener
to reduce crankshaft torsional vibration
where is the drive pulley on a gravity drop drive
below the head pulley
the materials ability to emit thermal radiation
emissivity
___________ is the process of assuring that all systems and components of a building or industrial plant are designed, installed, tested, operated, and maintained according to the operational requirements of the owner or final client
commissioning
Deficiencies are then classified as _______________ identifying when each must be complete
type-a, type-b, or type-c
_______ is critical and must be addressed before proceeding to the next activity.
Type-A
_______ does not need to be addressed immediately and does not impact subsequent activities but must be rectified prior to handover to the owner.
Type-B
______ deficiencies are minor defects and are agreed by the owner to be rectified after handover.
Type-C
during the design and procurement phase of the project, a criticalstep prior to equipment delivery to site is _____________
Factory acceptance testing (FAT)
______ is the most thorough verification and will make on-site commissioning go much smoother if it is known in advance that the equipment delivered to the site works.
FAT
_________ occurs at the end of construction once the equipment is installed.
Mechanical completion
upon mechanical completion of eachportion of the work, and deficiencies agreed to, ___________ activities can thencommence
Pre-Commissioning
____________ is the last phase in the lifetime of a facility, following its design, construction, operation, amd permanent shutdown.
decommissioning
_______ refers to putting the facility in an idle state or temporary shutdown in a manner that allows restarting later, when the business environment makes the process attractive again
mothballing
once it is clear that the plant has to be shut down, start planning the 3D process which is?
Decontamination, Dismantling and Disposal
_________applications include material transfer and machine loading and unloading.
material-handling
_________ this is a device that is attached to the end of a robotic arm to carry out its tasks
grippers and effectors
____________ sometimes referred to as an end effector is a crucial aspect of robotic technology
End of arm tooling (EOAT)
____________ also referred to as rectilinear or gantry robots, these cartesian robots consist of three linear joints that use the coordinate system of X, Y & Z. usually with a wrist attached for rotational movement.
cartesian
____________ cobots typically have a sieek shape, with no pinch points and with internal features such as motors and wires.
collaborative robot (cobot)
__________ stands for selective compliance articulated robot arm.
SCARA
_________ who possessess greater skills, knowledge and experience.
mentor
______ who is looking to increase their skills, knowledge and experience
mentee
tools and equipment used to ______. _______. _______ and repair robotics and automative
install, diagnose, maintain
the most efficient type of steam turbine is?
condensing
how do friction bearings self alining
spherical seat
what is the purpose of a defuser on a turbine
turn high speed into pressure
The most important factor in a centrifugal bucket conveyor
Speed
Shaft that joins two screw conveyors
Dungeon shaft
What chain is used for a side load?
Rooftop or Camelback
Ratchet and pawl is a type of
Backstop
What are the 3 main types of hydraulic turbines?
Pelton, Francis, Kaplan
What is the purpose of a diffuser on a turbine
Turn high speed into pressure
The most efficient type of steam turbine
Condensing
How do friction bearings self-align?
Spherical seat
Best way to lift a turbine?
Spreader bar
What is the purpose of lagging on steam turbines?
Retain heat and protect personnel
What drives a turbo?
Exhaust gas
What is the blading called in a diaphragm?
Reaction type blades
Which blades do not have a pressure drop?
Impulse type
How many times do the crankshaft rotate for 1 cycle of a 4-stroke engine?
Twice
Which pulley do the load travel towards?
Head pulley
Which pulley is usually the driven?
Head pulley
What is the crown pulleys purpose?
Helps keep the belt centred
What is the guide rollers purpose?
To help direction of the belt stop the belt from hitting the steel frame
Which zone takes the most wear?
The loading point
Where do you place impact rollers?
Underneath shoots
What kind of takeup do you use on small flat belts?
Screw take ups?
What’s lagging’s purpose on a tail pulley?
To increase the coefficient of friction between belt and pulley
What is ultrasonic testing used for?
To find cracks/defects
What should you do to paint before mag particle testing?
Remove? Grind off?
What is used to measure vibration?
Vibration probe/analyzer?
Which part of the belt takes the shock absorb?
Carcass
what tool is used for layout of a robotic system
Theodolite
What is the difference between the 6-axis/7-axis robot?
Freedom of movement
Robotic lockout tagout question
ECU (Electronic Control Unit)
How do you balance a pump impeller?
Measure original imbalance, install a trial weight, place the correction weight
What is caused by keyways on a shaft?
Dynamic imbalance
Reason for axial fan to be unbalanced
Dirt build up/dirt fall off
Definition of side to side unbalanced
Static imbalance
Definition of quasistatic
Static and couple
Belt speed formula (gear box)
A series of letters and numbers
When should you adjust the packing on a cold water pump?
After it starts
Confirm communication with mentor
Repeat
What is meant by cold alignment on a water pump?
Doing it at room temperature
What is displacement measured in?
Thousandths of an inch or hundredths of a mill
When all components have the same phase angle, this is called ___________ ?
In phase
Best way for mentor to assess progress
Watch them
Procedure for dye penetrant
Clean material, spray on penetrant, let it dwell, spray cleaner on rag, spray developer
What is the most important thing when starting up a steam turbine?
Test emergency trip
What houses a screw conveyor
Trough
Oil analysis shows:
Oxidation, additive breakdown and any metals, fuel or glycol in the system.
Back lash couplings are used for
Accuracy
When removing buckets from a bucket conveyor make sure to keep it
In balance
Most accurate way to remove weight on a “shive”? Is to
Drill holes
Valves on top of a steam turbine
Throttle valves
Blades on the discharge end of a turbine are
Bigger
When do you shut off the jacking pump on a turbine?
60rpm
Steps to starting a gas turbine are:
-build pressure
-fuel and igniter
Blades past the combustor are
The turbine
2/3rd of power from a gas turbine goes to
Compress it’s own air
Spectrograph is good for detecting
Early failure in lubricant
In order to get a spectrum from a sinwave you need
FFT
If an axial vibration is 50% or more it is
Radial
