Tq Studies Flashcards
Hunting =
When the governor is chasing its tail around the steam
Speed droop?
Speed droop is a governor characteristic that requires a specific decrease in speed before the governor tries to give an increase in throttle
Mechanical hydraulic governor
Uses hydraulic force supplied through a pump, with the flyball merely controlling flow of the fluid used to actuate the servo valve which changes the throttle setting
Hydraulic governor
Speed sensitive element in pure hydraulic governor used the change in pressure of a fluid discharged from a shaft mounted pump
Lowered viscosity =
Speed increase
Xic symbol
Examine if closed symbol
XIO symbol
——[ /. ]——-
Ote symbol
——< >——
Speed drift?
Gradual deviation in speed in a prime mover that is not properly governed
Two most common methods of measuring pressure ( switches )
- bellows operated pressure switch
- diaphragm operated switch
Main cause of oxidation?
Is heat ( gum and varnish results in sticky valves )
How many times do you flush oil sample before taking it ?
Flush 5 times the dead space volume before collecting your sample
Micron size filters?
4/6/14
What measures phase?
Strobe light
Example of a splash lube ?
Oil dipper
How would you check if it’s an electrical problem ?
Observe the change in vibration when you turn off the power to the motor
Oz inches ?
Twice the distance half the weight
3 things to determine trail weight size
Weight of the rotor , rotor rpm, radius at which you placed the trial weight
Which blade would you put more weight if you needed to on a fan?
Blade closest to the imbalance will receive more weight ,
Blind closes?
Two flanges
Where is the highest pressure when it comes to piping and flanges ?
Bolt circle is the highest pressure
When making a gasket with a hammer what might you do?
Install 2 bolts to hold gasket in place
How do anaerobic sealants cure ?
In the absence of air
Cast iron pipes?
Corrosion erosion resistant
Which type of elbow has male and female threads ?
Street elbow
Which type of gasket can withstand the highest pressures?
Steel ring !!
If the pipe doubles in size what happens to the speed of the fluid?
1/4 the speed
Which 2 things dictate gasket material?
Internal pressures
Bolt clamping force
Optimum mounting degree and benchmark gauge?
Mounting degree ideal 90 degree
Benchmark gauge ( the ball ) 95 degrees
What is something proximity probes require?
Water cooled jackets
How does one measure pipe strain?
At the coupling 0 degrees and 90 degrees
What insulation is used in the coldest temperatures?
Cellular glass
Which type of insulation can withstand the most heat
Ceramic
Research and development of new technologies falls under?
Innovation catagories
Blue seal ?
Business component
Abrasive chain type?
Mill chain
Abrasive chain type?
Mill chain
Two types of transfer chains?
Rooftop ( camelback) and roller
How is the width of the conveyor determined?
By the width of the largest package carried on it
Smallest # of rollers under any container @ anytime ?
3 rollers min
Smallest number of skates under a package ?
5 skates minimum
Ideal Chute design when loading ?
Centre material on the belt , direction of the belt at the same speed
Chain sag
2-3%
What type of chain does not bend backwards?
Rooftop chain
What causes a diesel to misfire ?
Sticky valves
BMEP?
Brake mean effective pressure
Spray bar carb is associated with what type?
LPG
How is the block deck height measured ?
From the centre of the crank to the bottom of the liner bore
Maximum deviation of the main bearing bore on engines ?
1/2 the initial ( new ) bearing clearance
Never use what in a chrome cylinder bore?
Never use chrome rings in a chrome bore
6 cyl 2 stroke engine has how many power strokes per revolution?
6 power strokes per revolution
How is crankshaft deflection corrected ?
Shimmed
On which strokes are the valves closed in an engine?
Compression and power stoke
What is valve overlap
When both the intake and exhaust valves are open at the same time
What is caused by pre ignition?
Hot spots in the cylinder
What does artificially asperating an engine do?
Increase the hp
Electrons flow? And conventional flows ?
Electrons flow - to +
Conventional flows + to -
What do transformers use to step up or step down voltages ?
Inductance
How is an ammeter measured ?
In series
How is a volt meter measured ?
Parrallel
How is a volt meter measured ?
Parrallel
Stop button is?
Normally closed , you hit it and it opens the circuit ( cuts the power )
Where do you peen the blades and what keeps the shroud on the blades
On the outside of the tenon
What does the condensor do in a steam turbine?
Increases pressure differential ( vacuum)
What causes the main stop valve to close?
The spring
Where is the highest pressure located in the gas turbine?
The diffuser
What is used for quick bearing checks on turbines?
Bridge gauge provided by manufacturers
Where is the secondary air introduced in the gas turbine?
It is introduced in the combustion chamber in the intermediate part
Gas turbines act on both?
Impulse and reaction blades
( compressor side + turbine side)
What does the centrifugal separator do?
Cleans the air
Where is the temp and power measured in a gas turbine?
Before and after the turbine portion
Where is wire lacing found??
Low pressure big blades
Where might you find erosion of blades?
Low pressure side of blades
Direction of thrust in a steam turbine ?
Towards the direction of flow
Insufficient valve lash could cause?
Burnt valves
Insufficient valve lash could cause?
Burnt valves
Thicker head gasket will result in?
Power loss / decreased compression ratio
Too much valve lift will result in ?
Shorter valve lift / movement
Parasitic means?
Robs energy from engine
Black smoke could result in?
Bad injection timing
Oil type in an engine?
Low ash with detergent
What does the switching of a primary circuit ?
Transistor
Higher the fules octane rating less
Detonation
What happens in the nozzles of a veloctity compounding turbine )
Nozzles pressure drop velocity up
Low pressure balance the thrust?
Dual flow
Where is the diaphragm located in a turbine?
Fixed to casing sealed to rotor
Why is a steam gland used?
To ensure air does not leak ij
Where is the majority of compression air in a gas turbine used for?
SECONDAIRYARRRRR
Purpose of govenor ?
Maintain selected speeds , limit slow and fast speeds
Gradual deviation of speed?
Speed drift
What do the flyweights control on a mechanical governor
Spool valve
Static imbalance?
Only imbalanced on one plane
Couple imbalance?
Opposite imbalance so 180 of each other
Everything else is ?
Dynamic balance ( weight wearever )
Votage = electrical _______
PRESSURE
Votage = electrical _______
PRESSURE
Resistor applications ??
Heating element
Short circuit ?
Low resistance to ground with high current
Output voltage of a transformer = number of turns in a
Secondary coil
What type of roller is best for a corner
Tapered rollerb
Regeneration type gas turbine =
One turbine , waste heat from exhaust is added to air after compressor before combustion ( effecient )
Cogeneration type gas turbines
2 turbines, the exhaust is used to power a steam turbine
Impulse nozzles=
Change pressure to velocity in one step
Psi down velocity up
Impulse blade fixed and rotating
Roating blades= psi stays the same velocity down
Velocity compounding =
Nozzles switch velocity up psi down, then rotating impulse blades psi stays the same velocity down, fixed blades psi stays and velocity stays the same
Reaction blades?
Fixed blades = psi down and velocity Up
Moving blades psi down and velocity down
