3B2 Ch 2 Flashcards
B2C02Q02 In the event of a large load rejection or following a steam turbine trip while operational and under load, an automatic valve is placed on one of the steam lines between the control valves and HP turbine section to depressurize the HP turbine and reheater. What is the name of this valve?
Select one:
a.
Ventilator dump valve
b.
Packing blowdown valve
c.
Spray valve
d.
Turbine depressurization valve
a.
Ventilator dump valve
The high-pressure oil system of a typical turbine supplies oil to which component(s)?
Select one:
a.
Bearings
b.
Gears
c.
Emergency stop valves
d.
The oil purifier
e.
The auxiliary oil pump
c.
Emergency stop valves
Overspeed trips:
Select one:
a.
Are an optional device on a turbine
b.
Are linked to the speed pickup
c.
Are independent of the governing system
d.
Can be disabled to test critical speeds
e.
May only be mechanical, hydraulic, or mechanical-hydraulic
c.
Are independent of the governing system
In a turbine circuit, what do feedwater heaters and deaerators do?
Select one:
a.
Use up excess steam
b.
Increase efficiency
c.
Provide load during low demand periods
d.
Lighten the load on the condenser
e.
Increase turbine output
b.
Increase efficiency
What happens when a hydraulic overspeed trip operates?
High-pressure oil forces the main steam valve shut.
The high-pressure oil supply is shut off.
The stop valve oil cylinder drain is closed.
The stop valve oil cylinder drain is opened.
A spring closes the main steam valve.
The pilot drain is closed.
Select one:
a.
1, 3, 6
b.
2, 4, 5
c.
3, 4, 6
d.
2, 4, 6
e.
3, 4, 5
b.
2, 4, 5
The barring gear:
Select one:
a.
Is started when the lube oil temperature reaches 35°C–40°C
b.
Is started when the jacking oil pump pressure reaches 3000 kPa–4000 kPa
c.
Is used only when starting a turbine
d.
Should disengage and automatically shut down after steam starts to rotate the turbine
e.
Should be disengaged before turning over the turbine
c.
Is used only when starting a turbine
