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Ohio stationary steam engineer
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Ohio stationary steam engineer
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Ohio stationary steam engineer2 forces of equal intensity acting in opposite directions is? - ANS-tension
A boiler has been under stress for an extended period of time with high alakalinity
concentration maintained in the water. This can cause? - ANS-caustic embrittlement
A boiler has carried a large slug of water over into steam. This condition is called: -
ANS-priming
A boiler is an industrial boiler when - ANS-the steam generated is used for process
A boiler is industrial when: - ANS-The steam is used for a manufacturing process
A centrifugal pump is characterized by its: - ANS-diffusion rings
a centrifugal pumps performance and long life depend on: - ANS-wear rings and thrust
imposed
A difference between a check valve and a non-return valve is: - ANS-a non-return valve
acts as a "cushioning" valve that helps prevent chattering
A flame scanner containing a lead sulfide cell is sensitive to - ANS-Infrared radiation
A gauge that reads higher than actual boiler pressure is called a: - ANS-fast gauge
A high-viscosity lubricant is more likely to develop ______ than a low-viscosity oil? -
ANS-Heat
A lubrication with low viscosity is usually: - ANS-adapted to high RPM use
A motor-driven mechanical centrifuge is used for? - ANS-reconditioning turbine oil
A steam turbine operates at 4500 RM. At what speed should the trip be set? -
ANS-4950 (10% over normal operation speed)
A steam turbine that operates at 500 psi is considered? - ANS-high pressure
,A sudden increase in the temp of the flue gases entering the stack from the breeching
would likely indicate: - ANS-a broken flue gas baffle
A superheater safety valve relieves how much of the total steam produced by the
boiler? - ANS-20%
A therm of natural gas is_____ - ANS-100,000 BTU reguarless of the exact volume
A thermostatic steam trap opens under what conditions? - ANS-When the temp inside
the trap lowers
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: - ANS-back-pressure turbine
A type of pump that uses the velocity of steam against a mass of water is a : -
ANS-injector
A wet scrubber that has been maintained properly has the capablility of absorbing
____% of SO2 in flue gases - ANS-90%
adding water to increase combustion in a coal fired boiler is called: - ANS-tempering
All of the following are causes of vibration in a turbine EXCEPT:
-priming from boiler
-misalignment of the turbine shaft
-condenser cooling water too warm
-passing through critical speed - ANS-condenser cooling water too warm
An impulse turbine utilizes one row of stationary nozzles which increase the velocity of
the steam enough to drive 2 rows of rotating blades. This type of turbine is called a: -
ANS-Velocity-compound turbine
At what temp does a fusible plug melt? - ANS-450 degrees
At what temp should you add cooling water to a turbines bearings? - ANS-110-120
degrees
Before dumping a boiler, which conditon should be met? - ANS-the boiler metal should
be cool enough to touch contunually
, Blowdown (blowback) of a safety valve should not be less than ____psi in any case -
ANS-2psi
Blowdown (blowback) of a safety valve should not be more than ____% in any case -
ANS-4%
Boilers laid up dry, have what material placed inside to absorb moisture? -
ANS-Quicklime or silica gel
Calcium and magnesium are removed by what external water treatment process that
can be regenerated using sodium chloride? - ANS-zeolite softener
Cast iron or ductile iron pipe is used for: - ANS-underground water supply and drainage
Combustion efficiency may be increased by_____ the primary air - ANS-Preheating
Considering the limitation on materials of construction of a steam turbine, what is the
maximum temp steam that may be used - ANS-1100 degrees (could also be 1050)
Copper and brass piping may be used for piping systems as long as the temp does not
exceed - ANS-406 degrees
Diffusion rings are found in: - ANS-turbine style centrifugal pumps
Down comer tubes are used in watertube boilers for what purpose - ANS-supply water
to the lower waterwall headers
During the start-up of a large steam turbine, the speed is gradually increased so that the
operating speed may be reached. The turbine operates smoothly, but at a particular
RPM range, a significant vibration is encountered. What should the operator do? -
ANS-Increase the speed to get through the RPM range as quickly as possible
For maximum efficiency what is true about superheated steam? - ANS-a constant
superheated steam temp is desirable
For safety valves set to pop at 100-300 psi blowdown must not be less than ____% of
popping preassur - ANS-2%
For what is the ringlemann test used? - ANS-measure smoke density leaving the stack
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