Ohio stationary steam engineer
Combustion efficiency may be increased by_____ the primary air - Answer- Preheating
What is the purpose of cinder reinjection? - Answer- increase efficiency
2 forces of equal intensity acting in opposite directions is? - Answer- tension
What is true about ...
Ohio stationary steam engineer
Combustion efficiency may be increased by_____ the primary air - Answer-
Preheating
What is the purpose of cinder reinjection? - Answer- increase efficiency
2 forces of equal intensity acting in opposite directions is? - Answer- tension
What is true about the dew poimt of flue gasses - Answer- dew point is the temp at
which the gasses will condense
What will not cause high stack temps? - Answer- plugged dry pipe
What is true about smoke - Answer- smoke consists of unburned hydrocarbons
WHat is used to reduce SO2 emissions in coal fired boilers? - Answer- Wet or dry
scrubbers
In a solid fuel fired boiler, a gradual increase in flue gas exit temps over a course of a
shift inidicates the boiler operator needs to _______ - Answer- operate soot blowers
What watertube bolier is the largest in size and steam-generating compacitity -
Answer- Utility watertube boiler
the blowdown on a safety valve can be altered by changing the setting of the _____ -
Answer- huddling ring
Copper and brass piping may be used for piping systems as long as the temp does
not exceed - Answer- 406 degrees
What is not measured in a 3 element feedwater system
-feedwater flow
-drum pressure
-steam flow
-drum level - Answer- drum pressure
If the flame in a gas-fired bolier is pulsating how can the problem be fixed? - Answer-
increase furnace draft
Grindability of coal is an issue to be considered when operating which kid of coal-
burining equipment? - Answer- ball-and-race pulvarizer
When using an induced draft fan, where will the strongest negative draft be found -
Answer- at the inlet of the ID fan
,How do you bank a fuel oil-fired boiler? - Answer- turn off the fuel and air supplies,
the re-light the burner as necessary to maintain a predetermined minimum steam
pressure
What is true about the lube oil used in a steam turbine - Answer- it must readily
seperate oil and water
What supplies the oil to a large steam turbine during start-up - Answer- aux oil pump
What device prevents the over-travel of the governor linkage that might be caused
by the weight of the governor components - Answer- Dashpot
When taking a boiler out of service what should you not do - Answer- close the vent
what type of turbine oil purification system periodically removes a potion of the oil
and replaces it with fresh oil? - Answer- makeup oil system
what type of steam turbine system has steam take-offs prior to going into the
condenser? - Answer- extraction turbine
What is the pressure above which the exhaust side of a steam turbine and the
connected piping may be protected by either a safety valve or a rupture disc, or a
combination of the 2 - Answer- 15 psi
What grade fuel oil may be ignited by an electric spark from electrodes powered by
an ignition transformer? - Answer- #2
what is the cheapest, easiest form of water treatment? - Answer- heating the water
A turbine exhausts steam @ 15 psi. This steam is used in a low-pressure application
such as a deareator. this type of turbine is called a: - Answer- back-pressure turbine
At what temp should you add cooling water to a turbines bearings? - Answer- 110-
120 degrees
What is produced from the reaction between sodium sulfite and oxygen? - Answer-
sodium sulfate
What is the purpose of an attemperator - Answer- reduce temp of superheated
steam by adding a water mist
What are the 2 main methods by which steam is prevented from leaking out around
the turbine shaft where the shaft exits the casing? - Answer- labyrinth seals and
carbon rings
If the water in a boiler is foaming, the water level indication in the gauge glass will
be: - Answer- erratic
Cast iron or ductile iron pipe is used for: - Answer- underground water supply and
drainage
, What is the maximum allowable level of dissolved solids in the steam being supplied
to a steam turbine? - Answer- .1 ppm
If a boiler requires a second safety valve, the highest pressure setting on the
additional valve should not exceed the MAWP by more than - Answer- 3%
Steam is tapped off a turbine casing at several pressures for aux. uses in the
production plant. the steam is called: - Answer- extraction steam
If the tubes in a boiler are flared during installation, which of the following is true?
-The ID is increased
-The OD is decreased
-The length is decreased
-the wall thickness is increased - Answer- The ID is increased
What problem is caused by dirty condenser tubes? - Answer- inability to maintain a
normal vacuum on condenser
A lubrication with low viscosity is usually: - Answer- adapted to high RPM use
On a bicolor gauge glass water will appear ____ and steam will appear _____ -
Answer- green, red
Name 2 common classes of steam turbine blading: - Answer- impulsive and reactive
Which of the following is NOT an advantage of operating a steam turbine
condensing?
-the condensate from the steam in recovered
-the HP developed by the turbine is increased
-The speed of the turbine is decreased
-Recovery of hot condensate increases boiler efficiency - Answer- The speed of the
turbine is decreased
A boiler is industrial when: - Answer- The steam is used for a manufacturing process
What is the function of the dashpot? - Answer- prevent over-travel due to the weight
of the governor linkage
Which of the following is part of the weekly preventitive maintenance program for a
steam turbine?
-Test the overspeed trip
-inspect turbine exterior
-change oil
-Lubricate the throttle valve - Answer- Inspect exterior
What oil pressure should be maintained when using a turbine oil pump with a relief
valve - Answer- 50-55 PSI
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