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A boiler has quick- and slow-opening blowdown valves. The
sequence used for
a blowdown is ? - ANSWER-open quick-opening, open slow-
opening, close
slow-opening, close quick-
opening.
The most important boiler fitting is the ? - ANSWER-safety
valve
The valve with the least amount of restriction is the ______
Valve. - ANSWER-
gate
For low pressure steam boilers, the capacity of the safety
valve must be large
enough that the boiler pressure cannot rise more than
_______ above the
MAWP. - ANSWER-
5 psi
Flame safeguard systems can monitor ? - ANSWER-Pilot and
main flame
, Sensors used for flame detection in boilers include ? -
ANSWER-lead sulfide
cell, ultraviolet scanner,
thermocouple
A ______ blowdown is performed to remove sludge from the
boiler. - ANSWER-
bottom
A pH level of 7.0 is an indication that the boiler water is ? -
ANSWER-neutral,
neither basic or
acidic
Standard atmospheric pressure is approximately _____ psia ? -
ANSWER-14.7
Specific gravity is the ratio of weight of a volume of a substance
to the weight of
the same volume of ? -
ANSWER-water
Heat transfer can occur by ? - ANSWER-conduction,
convection, radiation
The theoretical amount of air is often called the ________
amount of air. -
ANSWER-
stoichiometric