Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
21 Cards in this Set
- Front
- Back
The use of tubular gauge glasses is limited to lower __________ and __________. Also they are restricted to __________ and __________ material. |
Pressures and temperatures Nontoxic and non hazardous |
|
Tubular gauge glasses should not exceed _______mm in length. |
750 mm |
|
The lowest visible water level in a Guage glass shall be at least _____ mm above the lowest permissible water level as determined by the manufacturer. |
50 mm |
|
For a horizontal fire tube boiler with a diameter greater than _____ mm, the lowest visible water level in the gauge glass must be at least _____ mm above the lowest permissible water level |
400 mm 75 mm |
|
If the Guage glass leaks when put into service, _____________________ while the glass is under pressure. |
Do not tighten the nuts |
|
Round tubular Guage glasses are not recommended for pressures above _______ kPa |
2800 kPa |
|
When using try cocks to maintain fluid levels try to keep the water between the __________ and ___________ try cocks. |
Middle and upper |
|
Water column material: Cast iron 0 to _______kPa Malleable iron 0 to ________kPa Steel ________kPa and above |
1720 kPa 2410 kPa 2410 kPa |
|
A great advantage of an Igema level indicator over a Hopkinson unit is: 1) There are no moving parts 2) It is the least costly to purchase 3) It has the highest degree of accuracy 4) Its ability to show steam and water as different colors 5) It requires no electricity |
1) There are no moving parts |
|
Connections for gauge glasses connected directly to the power boiler or to an intervening water column shall be at least: 1) 20 mm 2) 76 mm 3) 25 mm 4) 50 mm 5) 15 mm |
5) 15 mm
|
|
Dirt traps are installed on an "Igema" remote water level indicator: 1) To prevent osmosis from occurring 2) So that overfilling of the indicating section is prevented 3) To prevent indicating liquid contamination 4) To prevent mixing of the indicating liquid with boiler water 5) Because of the high amount of suspended solids collecting in the constant head |
3) To prevent indicating liquid contamination |
|
Each gauge glass shall be fitted with a drain cock or valve having an unrestricted drain opening of not less than _____ diameter to facilitate cleaning. 1) 2 mm 2) 10 mm 3) 6 mm 4) 25 mm 5) 15 mm |
3) 6 mm |
|
Gauge glasses show a water level that is: 1) Slightly less than the level if the vessel is at a lower temperature 2) The actual vessel level regardless of pressure, temperature, or density differences 3) Slightly higher than boiler level when the pressure is high 4) Slightly lower when the glass water density is higher 5) The same if all liquids have the same temperature |
4) Slightly lower when the glass water density is higher |
|
Transparent gauge glasses are lined with mica to: 1) Prevent erosion of glass 2) Increase strength of the glass 3) Provide a high temperature seal 4) Cool the glass 5) Make level easier to see |
1) Prevent erosion of glass |
|
A gauge glass which shows a clear liquid as being very dark is the: 1) Flat gauge glass 2) Tubular gauge glass 3) Igema indicator 4) Hopkinson indicator 5) Reflex gauge glass |
5) Reflex gauge glass |
|
The quick closing valves on the water gauge requires only a/an _____ of a turn of the valve spindle to change the valve from the full open to the full closed position and vice versa. 1) One-third 2) Fifth 3) Eighth 4) Half 5) Quarter |
5) Quarter |
|
A disadvantage of a gauge glass safety shutoff valve is: 1) It makes gauge glass replacement more difficult 2) The glass cannot be blowndown 3) It cannot withstand high pressure 4) Loss of water is not prevented 5) It requires more maintenance |
5) It requires more maintenance |
|
The following conditions may be encountered in level measurement and indication: 1) Extremes of heat and cold 2) Pressure variations 3) All of the above 4) Corrosive and explosive conditions 5) Solids or liquids |
3) All of the above |
|
The main operating element of a Hopkinson remote water level indicator is a: 1) Float 2) Ledoux bell 3) Capsule 4) Large diaphragm 5) Bourdon tube |
4) Large diaphragm |
|
For pressure above 2 800 kPa, a gauge glass housing is constructed of: 1) Cast iron 2) Aluminum 3) Stainless steel 4) Steel 5) Brass |
4) Steel |
|
For pressure above 2 410 kPa, a water column is constructed of: 1) Stainless steel 2) Steel 3) Brass 4) Cast iron 5) Aluminum |
2) Steel |