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A dryback scotch marine firetube boiler is 8′-6″ in diameter
and has a flue furnace that is 30″ in diameter. The boiler is
17′-3″ long and has 122 tubes that are 2″ in diameter. If
the tube sheets are disregarded, the boiler has ___ sq ft of
heating surface. - Answer-1239
___ is the erosion that occurs as steam or another high-
velocity fluid streaks through a small opening, such as one
created by a throttled valve. - Answer-wire drawing
Boiler tubes can fail due to ___. - Answer-all of the above
The circumference of a boiler shell that is 6′-3″ in diameter
is ___′. - Answer-19.652
When a boiler is equipped with a superheater, the safety
valve that should lift at the lowest pressure is ___. -
Answer-the super heater safety valve
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A(n) ___ line provides a minimum flow through a
centrifugal pump to prevent overheating and cavitation
when the pump must operate against a closed discharge
valve for a period of time. - Answer-recirculation
An area of 32 sq ft contains ___ sq in. - Answer-4608
There must be adequate ___ across any steam trap for
the condensate and/or air to be removed from the steam
system. - Answer-differential pressure
When 200 lb of water is heated from 62°F to 75°F, ___ Btu
is absorbed. - Answer-2600
A(n) ___ is used to reduce sulfur dioxide emissions. -
Answer-flue gas scrubber
A ___ protects a Bourdon tube inside a pressure gauge
from warping due to the high temperature of the steam. -
Answer-siphon loop
A column of water 150′-0″ high exerts a pressure of ___
psi at the bottom of the column. - Answer-65
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The short stubs of piping connected to a boiler during
construction to provide attachment points for piping and
appliances are called ___. - Answer-nozzles
The acronym MATT stands for ___. - Answer-mixture,
atomization, time, and temperature
Grades of fuel oil are designated by number. They range
from ___ through ___. - Answer-1 - 6
The order in which a sodium zeolite water softener
regenerates is ___. - Answer-backwash, brine, and rinse
A ___ valve should be placed at the discharge of a
positive-displacement pump. - Answer-relief
Large amounts of combustible material in furnace ash are
most likely caused by ___. - Answer-inadequate forced
draft