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15 Cards in this Set
- Front
- Back
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The continuous blowdown valve is usually a ___________ valve with an indicator. A. Regulating B. Globe C. Gate D. Non return |
A. Regulating |
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Silica is removed from the steam through the use of: 1) Cyclone separators 2) Wash water 3) Drum baffles 4) Chevron dryers 5) Dry Pipe |
2) Wash water |
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Which of the following is not a drum internal? 1) The corrugated scrubber 2) The separator 3) The intermittent blow off line 4) The baffle 5) The internal chemical feed pipe |
3) The intermittent blow off line |
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Impurities must be removed from steam leaving the boiler because: 1) They can cause water hammer on turbine blades 2) They deposit on the economizer tubes 3) Deposits will form on turbine blades 4) They cause higher steam temperatures in the superheater 5) They get stuck in the non-return valve |
3) Deposits will form on turbine blades |
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Some smaller boilers have a pipe and baffle device in the steam drum that acts as: 1) Drip collector baffle 2) A scrubber 3) A separator 4) A chemical injection device 5) An internal feed pipe |
3) A separator |
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Water treatment chemicals are injected: 1) Using an internal feed pipe below the drum baffles 2) Using an internal feed pipe near the bottom of the steam drum 3) Just below the water level in the steam drum 4) Just above the water level in the steam drum 5) Into the mud drum |
2) Using an internal feed pipe near the bottom of the steam drum |
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A drum internal which acts to reduce thermal shock and turbulence is the: 1) Cyclone separator 2) Chevron drier 3) Drip collector baffle 4) Internal feed pipe 5) Corrugated plate drier |
4) Internal feed pipe |
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The boiler continuous blowdown pipe is used to: 1) Reduce the total dissolved solid content to zero 2) Blowdown the boiler should the pressure exceed the MAWP 3) Remove the greatest concentration of dissolved solids from the drum 4) Remove the greatest concentration of suspended solids from the drum 5) Blow the chemicals into the boiler drum |
3) Remove the greatest concentration of dissolved solids from the drum |
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Modern boiler drum internals provide a place: 1) In which an oxygen scavenger can be introduced into the boiler steam 2) For the storage of steam so that load decreases can be accomplished quickly and smoothly 3) For suspended solids to settle out and accumulate 4) In which to install equipment to separate steam out of the water before the water leaves the boiler 5) For the storage of steam so that load increases can be accomplished quickly and smoothly |
5) For the storage of steam so that load increases can be accomplished quickly and smoothly |
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The cyclone separator: 1) Is located on the outlet of the superheater 2) Removes steam from the water by centrifugal force 3) Causes impurities to be thrown from the water 4) Discharges its water into the scrubber 5) Removes moisture from steam by centrifugal force |
5) Removes moisture from steam by centrifugal force |
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Steam separation in a modern boiler usually occurs in: 1) 2 steps 2) 4 steps 3) 5 steps 4) 1 step 5) 3 steps |
5) 3 steps |
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Chemicals are injected into the boiler to: 1) Prevent sludge 2) Keep sludge dispersed 3) Prevent corrosion 4) Prevent scale 5) All of the above |
5) All of the above |
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At lower pressures, steam: 1) Requires large volume spaces in order to separate 2) Has higher densities 3) Is more difficult to separate from the water 4) Cannot be separated from water with mechanical devices 5) Readily rises and separates from the water |
5) Readily rises and separates from the water |
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A boiler steam drum will: 1) Have no bearing or effect on water circulation 2) Not distribute feedwater to cold sections of the boiler 3) Allow load increases to be accomplished more quickly 4) Contain a steam space that will be a higher pressure than the water space 5) Always be the highest component of a boiler |
3) Allow load increases to be accomplished more quickly |
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The component of a boiler which allows a space for the introduction of chemicals is the: 1) Steam drum 2) Mud drum 3) Deaerator 4) Internal feed pipe 5) Injection tank |
1) Steam drum |
