Term
| Submerged arc welding is the standard method of construction of boiler drums. |
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Definition
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Term
| GTAW ia a welding process in which the electric arc is submerged or hidden beneath flux. |
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Term
| _____ tubes of a watertube boiler are exposed to the highest temperatures in the furnace area. |
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Term
Handholes are generally about ____ in size.
A. 2"x3" B. 4"x5"
C. 6"x8" D. 10"x12" |
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Term
The maximum capacity of a boiler is the _______.
A. area of the floor it occupies
B. volume of water its shell will hold
C. pounds of steam it will produce in 1 hr at a given pressure and temperature
D. gallons of water required to produce a given amount of steam at a given pressure and temperature |
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Definition
| C. pounds of steam it will produce in 1 hr at a given pressure and temperature. |
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Term
The formula for finding the circumference of a circle is _____.
A. C = pi x D
B. C = pi - D
C. C = pi + D
D. none of the above |
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Definition
A. C = pi x D
C=circumference
pi=3.14
D=diameter
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Term
The formula for finding the area of a circle is ______.
A. A = pi r2 B. A = pi D2
C. A = pi2 r D. A = pi 2 D |
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Definition
A. A = pi r2
Area equals pi multiplied by (r squared)
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Term
The volume of a tank that is 2' - 0" in diameter and 6' - 0" long is _____ cu ft.
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Term
| Waterwalls decrease heating surface of a boiler, helping to prevent refractory damage to the furnace because of overheating. |
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Term
| Steel is perferred over cast iron for boiler fittings. |
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Definition
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Term
The steam-venting capacity of a safety valve is confirmed by applying a(n) _____ test.
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Term
| What must be done to prevent damage from vacuum when draining a boiler? |
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Definition
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Term
| A superheater adds Btu to the steam and gives it the capacity to do more work. |
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Definition
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Term
| A safety valve pops open fully and imediately because the valve disc that closes against the seat of the safety valve is made in a two-stage pattern. |
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Term
____ is a severe form of carryover in which large slugs of water leave the boiler with the stem.
A. Entrainment B. Priming
C. Foaming D. Capacity |
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Definition
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Term
| Hot condensate contains less oxygen than cool makeup water. |
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Definition
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Term
A(n) ___ pressure control is a control device that regulates the burner for a higher or lower fuel-burning rate depending on the steam pressure in the boiler.
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Term
____ is the erosion that occurs as steam or another high-velocity fluid streaks through a small opening.
A. Throttling B. Blowdown
C. Steam tracing D. Wire drawing |
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Definition
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Term
| A(n) ___ may be formed inside a piece of heat exchange equipment when the steam supply is shut off and the steam inside the equipment collapses into condensate. |
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Definition
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Term
Changing a control device to a degree that is proportional to the need is called _____.
A. regulating B. equalization
C. wire drawing D. modulation |
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Definition
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Term
If a boiler has multiple safety valves, the valve set to lift at the highest pressure must not lift greater than ____% above the MAWP.
A. 3 B. 6
C. 10 D. 20 |
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Definition
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Term
| Carbon dioxide can chemically react with condensate to form ____ acid. |
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Definition
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Term
| The stem on a(n) ____ valve rises through the center of the handwheel, allowing the operator to visually determine whether the valve is open or closed. |
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Definition
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Term
Every steam trap must have adequate ___ across the steam trap in order for the condensate and/or air to be removed from the steam system.
A. differential pressure B. steam pressure
C. back pressure D. pressure equilization
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Term
____ is a benefit from the use of pressure reducing valves.
A. Smaller steam disdribution piping
B. More precise temperature control
C. Lower pressure ratings for steam-using equipment
D. all of the above |
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Definition
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