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問題一覧
1
19. Chilled water coil, active or passive dehumidifier?
Passive
2
What happens to water in a boiler that is at 80% load and all of a sudden the flame goes out?
Water will shrink and cause a low water condition
3
What’s an intercept valve?
Controlling steam flow from a high-pressure steam turbine to a low-pressure steam turbine. Closes with the main stops in a overspeed trip event.
4
What is a copper test used to test for?
Heat Exchanger
5
What is fly ash mechanical collector?
Collects fly ash from boiler flue
6
Primary purpose of using a wet scrubber?
To remove sulfur dioxides
7
First year of clean air act?
1963
8
What type of system uses same pipe for return and supply?
One pipe
9
At what temperature are brass and copper fittings not used on a boiler?
406/400 degrees
10
Last valve to be closed before lighting off?
Exonomizer vent
11
What creates Kinetic/Machanical in turbine?
Kinetic energy is the blades spinning from steam which moves the shaft. The mechanical energy is the rotor spinning causing the rotor to spin creating electrical energy
12
What is a Hotwell?
Turbine condenser water is stored here
13
A stoker that uses a feed RAM is a?
Underfeed stoker
14
What does a dearator do?
Heats feed water and gets rid of non-condensables
15
What’s followed by a rotating blade on turbine?
Stationary blade
16
How do you know if a dearating system isn’t working properly?
Using more oxygen scavenging chemicals
17
Which coal has the biggest level of fixed carbon content?
Anthracite
18
What color is R-407C?
Chocolate
19
What type of boiler operates off on/off controls?
Package Firetube
20
What causes overheating of boiler tubes?
Scale inside the tubes
21
What color is R-404?
Orange
22
When do you blow down a header on a water wall?
Under no load
23
R-22 replacement?
417A
24
Volume of steam at 0 psi greater then saturated liquid at 212 degrees?
1600-1700 times it’s volume
25
What is it called when a gate valve is cracked open and the pressure destroys it?
Adhesion-degradation
26
Where the condenser pump to?
Feed water system
27
Flow of steam through a superheater should never be less then ______ of boiler capacity
20%
28
Which coal has the highest volume of fixed carbon?
Anthracite
29
Why would a pump become steam bound?
Suction pressure drops low
30
How much water creates 1 pound of steam?
1 pound of water
31
How to prevent air getting into condenser system?
Gland seal/laberinyth. Condenser in vacuum
32
Purpose of wet scrubbers?
Filter Flue Gases
33
Which element does not take an actual action in the combustion process?
Nitrogen
34
Cold junction of thermocouple measures?
Reference
35
Percentage of oxygen in air?
21%
36
When is a pump steam bound?
Steam bound indicates the water is too hot for the suction of the pump, and the water flashes into steam with reduction of pressure
37
Force and area represents?
Pressure