Steam Boilers Tech Check 1 Flashcards
A low pressure steam boiler has a maximum allowable working pressure
MAWP) of up to
A. 15 psi
B. 35 psi
C. 100 psi
D. no MAWP
A. 15 psi
The evaporation of 34.5 lb of water/hr from and at a feedwater
temperature of 212 F is defined as
A a factor of evaporation
B. one boiler horsepower
C, latent heat of fusion
D. an evaporation test
B. one boiler horsepower
In a fire tube boiler, the heat and gases of combustion pass
A through the tubes
B. around the tubes
C. only through the combustion chamber
D. both A and B
A through the tubes
A fire tube boiler may be used
A. only in low pressure plants
B. only in high pressure plants
C. in high or low pressure plants
D. only for process steam
C. in high or low pressure plants
Because of the large volume of water, the boiler most likely to cause a boiler explosion is
A. a watertube boiler
B. a fire tube boiler
C. either a watertube or firetube boiler
D. boilers cannot explode
B. a fire tube boiler
A horizontal return tubular (HRT) boiler is boiler.
A. a fire tube
B. a watertube
C. either a firetube or a watertube
D. none of the above
A. a fire tube
As steam pressure in a boiler increases, there is a corresponding increase in the
A temperature
B, superheat
C. volume of steam
D. boiler horsepower
A temperature
A sudden drop in boiler steam pressure without a corresponding drop in boiler water temperature could result in
A. a loss of efficiency
B. a boiler explosion
C, an increase in surface tension
D. no effect on the boiler
D. no effect on the boiler
The part of a boiler that has the heat and gases of eombustion on one
side and water on the other side is known as the
A, water surface
B. steam surface
C. fire side
D. heating surface
D. heating surface
The comparison or ratio, of heat supplied in fuel to heat absorbed by water is defined as efficiency.
A. combustion
B. watertube
C. thermal
D, overall plant
C. thermal
Baffles are designed to direct the gases of combustion so that they come into close contact with the
A. feedwater
B. combustion chamber
C. superheater
D. boiler heating surface
D. boiler heating surface
The steam and water drum of watertube boilers is dished (concave) to eliminate the need for
A. brickwork
C. stays
B. waterwalls
D. baffles
C. stays
To increase the life of a furnace refractory, some watertube boilers are equipped with
A. waterwall blowdown lines
B. sinuous headers
C, box headers
D. waterwalls
D. waterwalls
vertical firetube boilers require
A, high ceilings
B. less floor space
C. the use of staybolts
D, all of the above
D, all of the above
In a watertube boiler, the heat and gases of combustion pass
A. through the tubes
B, around the tubes
c. through and around the tubes
D. only through the combustion chamber
B, around the tubes
