P99 LOW PRESSURE BOILERS COMPREHENSIVE UPDATED
EXAM QUESTIONS AND ANSWERS GRADED A+
✔✔The boiler steam pressure gauge must be connected to the ___ of the boiler -
✔✔highest part of the steam side
✔✔The purpose of a flame safeguard system is to protect the boiler from - ✔✔a
possible furnace explosion
✔✔A fire caused by the ignition of wood, paper or textiles is a Class ____ fire - ✔✔A
✔✔Flame scanners are - ✔✔equipped with a flame sensor
✔✔In a flame safeguard firing cycle, before the fuel oil valve can open, the flame
scanner must first - ✔✔purge the furnace
✔✔A change in the condensate return temperature can be caused by a malfunctioning -
✔✔steam trap
✔✔the flame scanner is located on the - ✔✔front of the furnace
✔✔heavy accumulation of soot in a boiler will result in - ✔✔loss of boiler efficiency
✔✔a feedwater regulator depends on the operation of a - ✔✔float-controlled valve
✔✔a relief valve is rated in ___ per hour - ✔✔btu
✔✔in a refrigeration system, heat is ___ when a fluid changes from a gas to a liquid -
✔✔released
✔✔A(n) ____ control system controls the amount of steam produced by changing the
burner firing rate - ✔✔modulating
✔✔a ___ boiler does not use tubes - ✔✔cast iron
✔✔a firetube that has a long cylindrical shape is a ___ boiler - ✔✔scotch marine
✔✔Safety valves are designed to pop open and stay open until ther is a ____ psi drop
in pressure - ✔✔2 to 4
✔✔The water column is located at the NOWL of a low pressure steam boiler, so the
lowest visible part of the gauge glass is ——- above the highest heating surface - ✔✔1
inch
, ✔✔a try lever test should be performed every ___ - ✔✔30 days
✔✔The water in the boiler is heated, turns to steam, and a leaves the boiler through the
- ✔✔main steam line
✔✔The vacuum pump pumps water and discharges air to the _____ - ✔✔atmosphere
✔✔The range of pressure on the vacuum switch is usually _____ - ✔✔2-8
✔✔excessive use of cold city makeup water reduces overall boiler efficiency because
the water must be ___ before use in the boiler - ✔✔heated
✔✔Steam header valves should be _____ valves. - ✔✔os&y gate
✔✔Steam traps remove ____ and ____ from the steam lines. - ✔✔air and water
✔✔Steam returning to the vacuum tank could cause the condensate pump to become: -
✔✔steambound
✔✔in a float thermostatic trap, the float rises to discharge - ✔✔condensate
✔✔a steam trap the fails to open causes the heating unit to become - ✔✔waterlogged
✔✔when cleaning a fuel oil strainer, the ____ must be carefully replaced to prevent air
from entering the system - ✔✔gasket
✔✔When using _____ draft, the boiler is limited in the amount of fuel that can be
burned - ✔✔natural
✔✔____ in the boiler water causes corrosion and pitting of the boiler metal - ✔✔Oxygen
✔✔water is ____ to reduce the amount of oxygen - ✔✔grated
✔✔Fuel oil is removed from the steam and water side of a boiler by using ___. -
✔✔Caustic soda
✔✔the boiler pressure should always be ____ the header pressure when cutting a
boiler in on the line - ✔✔slightly below
✔✔After blowing down the water column and gauge glass the water should _____ the
gauge glass - ✔✔quickly enter
EXAM QUESTIONS AND ANSWERS GRADED A+
✔✔The boiler steam pressure gauge must be connected to the ___ of the boiler -
✔✔highest part of the steam side
✔✔The purpose of a flame safeguard system is to protect the boiler from - ✔✔a
possible furnace explosion
✔✔A fire caused by the ignition of wood, paper or textiles is a Class ____ fire - ✔✔A
✔✔Flame scanners are - ✔✔equipped with a flame sensor
✔✔In a flame safeguard firing cycle, before the fuel oil valve can open, the flame
scanner must first - ✔✔purge the furnace
✔✔A change in the condensate return temperature can be caused by a malfunctioning -
✔✔steam trap
✔✔the flame scanner is located on the - ✔✔front of the furnace
✔✔heavy accumulation of soot in a boiler will result in - ✔✔loss of boiler efficiency
✔✔a feedwater regulator depends on the operation of a - ✔✔float-controlled valve
✔✔a relief valve is rated in ___ per hour - ✔✔btu
✔✔in a refrigeration system, heat is ___ when a fluid changes from a gas to a liquid -
✔✔released
✔✔A(n) ____ control system controls the amount of steam produced by changing the
burner firing rate - ✔✔modulating
✔✔a ___ boiler does not use tubes - ✔✔cast iron
✔✔a firetube that has a long cylindrical shape is a ___ boiler - ✔✔scotch marine
✔✔Safety valves are designed to pop open and stay open until ther is a ____ psi drop
in pressure - ✔✔2 to 4
✔✔The water column is located at the NOWL of a low pressure steam boiler, so the
lowest visible part of the gauge glass is ——- above the highest heating surface - ✔✔1
inch
, ✔✔a try lever test should be performed every ___ - ✔✔30 days
✔✔The water in the boiler is heated, turns to steam, and a leaves the boiler through the
- ✔✔main steam line
✔✔The vacuum pump pumps water and discharges air to the _____ - ✔✔atmosphere
✔✔The range of pressure on the vacuum switch is usually _____ - ✔✔2-8
✔✔excessive use of cold city makeup water reduces overall boiler efficiency because
the water must be ___ before use in the boiler - ✔✔heated
✔✔Steam header valves should be _____ valves. - ✔✔os&y gate
✔✔Steam traps remove ____ and ____ from the steam lines. - ✔✔air and water
✔✔Steam returning to the vacuum tank could cause the condensate pump to become: -
✔✔steambound
✔✔in a float thermostatic trap, the float rises to discharge - ✔✔condensate
✔✔a steam trap the fails to open causes the heating unit to become - ✔✔waterlogged
✔✔when cleaning a fuel oil strainer, the ____ must be carefully replaced to prevent air
from entering the system - ✔✔gasket
✔✔When using _____ draft, the boiler is limited in the amount of fuel that can be
burned - ✔✔natural
✔✔____ in the boiler water causes corrosion and pitting of the boiler metal - ✔✔Oxygen
✔✔water is ____ to reduce the amount of oxygen - ✔✔grated
✔✔Fuel oil is removed from the steam and water side of a boiler by using ___. -
✔✔Caustic soda
✔✔the boiler pressure should always be ____ the header pressure when cutting a
boiler in on the line - ✔✔slightly below
✔✔After blowing down the water column and gauge glass the water should _____ the
gauge glass - ✔✔quickly enter
