# Shared Flashcard Set

## Details

Boiler Operator's Workbook 4th Edition
Test on Chp. 2&3
25
Other
Not Applicable
10/08/2012

Term
 Submerged arc welding is the standard method of construction of boiler drums.
Definition
 True
Term
 GTAW ia a welding process in which the electric arc is submerged or hidden beneath flux.
Definition
 False (TIG)
Term
 _____ tubes of a watertube boiler are exposed to the highest temperatures in the furnace area.
Definition
 Riser
Term
 Handholes are generally about ____ in size.  A. 2"x3" B. 4"x5" C. 6"x8" D. 10"x12"
Definition
 B. 4"x5"
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
Definition
 C. pounds of steam it will produce in 1 hr at a given pressure and temperature.
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
Definition
 A. C = pi x D   C=circumference pi=3.14 D=diameter
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
Definition
 A. A = pi r2   Area equals pi multiplied by (r squared)
Term
 The volume of a tank that is 2' - 0" in diameter and 6' - 0" long is _____ cu ft.
Definition
 18.84
Term
 Waterwalls decrease heating surface of a boiler, helping to prevent refractory damage to the furnace because of overheating.
Definition
 False
Term
 Steel is perferred over cast iron for boiler fittings.
Definition
 True
Term
 The steam-venting capacity of a safety valve is confirmed by applying a(n) _____ test.
Definition
 accumulation
Term
 What must be done to prevent damage from vacuum when draining a boiler?
Definition
 open the vent
Term
 A superheater adds Btu to the steam and gives it the capacity to do more work.
Definition
 True
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.
Definition
 True
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
Definition
 B. Priming
Term
 Hot condensate contains less oxygen than cool makeup water.
Definition
 True
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.
Definition
 modulating
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
Definition
 D. Wire drawing
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.
Definition
 vacuum
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
Definition
 D. modulation
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
Definition
 A.3
Term
 Carbon dioxide can chemically react with condensate to form ____ acid.
Definition
 carbonic
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.
Definition
 OS&Y
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
Definition
 A. differential pressure
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
Definition
 D. all of the above
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