3B2 Ch 5 Flashcards
What kind of bearings do micro-turbines normally use?
Select one:
a.
Journal
b.
Radial tilt-pad
c.
Shell
d.
Anti-friction
e.
Air
e.
Air
Besides reducing NOX, water injection systems also have what effect?
Select one:
a.
Help keep the compressor blading clean
b.
Ddecrease the power output
c.
Stabilize the combustion process, thereby increasing the life of hot section components
d.
Reduce the gas turbine’s thermal efficiency
d.
Reduce the gas turbine’s thermal efficiency
Why is the fuel oil for a gas turbine treated?
Select one:
a.
To stabilize the fuel
b.
To remove dissolved gases
c.
To remove vanadium, sodium, and potassium
d.
To remove light ends
c.
To remove vanadium, sodium, and potassium
On-line cleaning of gas turbine compressors __________.
Select one:
a.
Is more effective than off-line cleaning
b.
Is most effective when using abrasives, such as walnut shells
c.
Can reduce the need for off-line cleaning
d.
Is performed with the engine at maximum crank speed
c.
Can reduce the need for off-line cleaning
What kind of bearings do heavy-duty gas turbines use today?
Select one:
a.
Journal
b.
Radial tilt-pad
c.
Shell
d.
Anti-friction
e.
Air
b.
Radial tilt-pad
How might the air delivered by a gas turbine’s compressor be used?
Select one:
a.
To cool the lube oil
b.
To remove ice from the air intake
c.
To cool the turbine blading
d.
To operate pneumatic control systems
b.
To remove ice from the air intake
A gas turbine operates with an outside air temperature of 40oC, and a relative humidity of 10%. If the outside air temperature was –5oC with a relative humidity of 65%, this gas turbine __________.
Select one:
a.
Will produce less NOX
b.
Will be less efficient
c.
Must operate its anti-icing system
d.
Will develop more power
d.
Will develop more power
The exhaust of a gas turbine most commonly contains which of the following?
1. Nitrogen oxides
2. Sulfur dioxide
3. Particulate matter
4. Carbon monoxide
Select one:
a.
1, 2
b.
1, 3
c.
2, 3, 4
d.
1, 2, 3
e.
1, 4
e.
1, 4
