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;
17 Cards in this Set
- Front
- Back
|
The following condition may be encountered in level measurement and indication: a) solids or liquids b) extremes of heat and cold c) pressure variations d) corrosive and explosive conditions e) all of the above |
e) all of the above |
|
|
Separately mounted gage glasses are used to provide a__________ indication of level over a certain vertical distance on the vessel. a) point b) continuous c) diagonal d) ultrasonic e) indirect |
b) continuous |
|
|
The main operating element of a Hopkinson remote water level indicator is a a) Bourdon tube b) Ledoux bell c) float d) capsule\ e) large diaphragm |
e) large diaphragm |
|
|
When a differential head meter is used to measure water level in a boiler steam drum, the connection to the steam space a) forms the variable leg of the meter b) is cross connected to the constant or reference leg of the meter c) is the low pressure side of the meter d) has a varying water level e) forms the constant or reference leg of the meter |
e) forms the constant or reference leg of the meter |
|
|
Dirt traps are installed on an "Igema" remote water-level indicator a) because of the high amount of suspended solids collecting in the constant head b) to prevent mixing of the indicating liquid with boiler water c) to prevent indicating liquid contamination d) so that overfilling of the indicating section is prevented e) to prevent osmosis from occurring |
c) to prevent indicating liquid contamination |
|
|
A great advantage of an Igema level indicator over a Hopkinson unit is a) it has the highest degree of accuracy b) it is the least costly to purchase c) its ability to show steam and water as different colours d) there are no moving parts e) it requires no electricity |
d) there are no moving parts |
|
|
A gage glass which shows a clear liquid as being very dark is the a) Hopkinson indicator b) Igema indicator c) tubular gage glass d) reflex gage glass e) flat gage glass |
d) reflex gage glass |
|
|
In a high pressure horizontal firetube steam boiler, the bottom of the gauge glass should be ____________ above the lowest permissible water level in the boiler. a) 1 m b) 50 cm c) 47 cm d) 25.4 mm e) 51 mm |
e) 51 mm |
|
|
If a gage glass breaks, the operator shall immediately a) shut the boiler down b) add more water to the boiler c) shut off the steam valve and water valve on the gage d) lift the safety valve e) shut the boiler down |
c) shut off the steam valve and water valve on the gage |
|
|
Try cocks are a) used to blowdown the gage glass b) for checking water level while the gage glass is out of service c) for draining the gage glass d) operated simultaneously e) on the water column drain line |
b) for checking water level while the gage glass is out of service |
|
|
How many try cocks are installed on the water column of a boiler, with over 9.3 square metres heating surface? a) 1 b) 2 c) 3 d) 4 e) 6 |
c) 3 |
|
|
When a firetube boiler is filled for the first time, it should be confirmed that when the water first appears in the gage glass, that there is _______ mm of water over the top of the tubes. a) 25.4 mm b) 50.8 mm c) 84 mm d) 101.6 mm e) 76 mm |
e) 76 mm |
|
|
Safety shutoff devices are found a) on water supply systems feeding a boiler b) on all gage glasses which are under continuous supervision c) only on vessels containing toxic liquid d) on the constant or "reference" lines to remote indicators e) on gage glasses not under constant supervision |
e) on gage glasses not under constant supervision |
|
|
Tubular gage glasses a) are suitable for pressures up to 2,800 kPa b) do not corrode due to high alkalinity c) indicate the level most accurately d) can be of any length e) are not weakened by misalignment |
a) are suitable for pressures up to 2,800 kPa |
|
|
Gage glasses show a water level which is a) slightly less than the level if the vessel is at a lower temperature b) the same if all liquids have the same temperature c) slightly higher than boiler level when the pressure is high d) slightly lower when the glass water density is higher e) the actual vessel level regardless of pressure, temperature or density differences |
d) slightly lower when the glass water density is higher |
|
|
When the water connection between boiler and gage glass becomes plugged, the water level in the glass will show a level after a while, that is a) higher than the level in the boiler b) lower than the level in the boiler c) the same as the level in the boiler d) fully filled e) lower than the bottom of the sight glass |
a) higher than the level in the boiler |
|
|
One more chapter til unit 13 is done!!!!!! |
|
