NCCER BOILERMAKER EXAM AND PRACTICE EXAM NEWEST ACTUAL EXAM COMPLETE 180 QUESTIONS
AND CORRECT DETAILED ANSWERS
A good safety practice is - ANSWER-Writing HOT on hot metal before leaving it unattended
When pure oxygen is combined with fuel gases, the pure oxygen produces - ANSWER-A high
temperature flame needed for flame cutting
The smallest standard oxygen cylinder holds about ____ cubic feet of oxygen. - ANSWER-85
Acetylene gas must be withdrawn from a cylinder at an hourly rate that does not exceed _____ of the
cylinder capacity. - ANSWER-10 percent
Safety fuse plugs in the top and bottom of an acetylene cylinder are designed to ___. - ANSWER-release
acetylene gas in the event of a fire
methylacetylene propadiene (MAPP) gas, a liquefied fuel used in oxyfuek cutting, burns at temperatures
almost as high as acetylene and has the stability of ___ - ANSWER-Propane
The amount of liquefied gas remaining in a cylinder is determined by the ___ of the cylinder. - ANSWER-
Weight
The regulators used in fuel gas cylinders are often painted red and always have ____ on all connections. -
ANSWER-Left hand threads
The attachment on top of a fuel gas cylinder that allows the gas to flow in only one directions is called a -
ANSWER-Check valve
The cutting tips used with liquified fuel gases must have at least ___ preheat holes. - ANSWER-Six
When lifting oxyfuel cutting cylinders, always use a - ANSWER-cylinder cage
,To avoid injury from dirt that may be lodged in the valve and regulator seat of a gas cylinder, always
stand ___ the valve when opening the valve to clear the regulator seat. - ANSWER-To the side of
When clearing debris from new oxyfuel cutting
equipment hoses, blow the hoses out
with_____. - ANSWER-Nitrogen or argon
The first step in selecting a cutting tip is to - ANSWER-identify the thickness of the material to be cut
Before opening cylinder valves, verify that the adjusting screws on the oxygen and fuel gas regulators are
____. - ANSWER-Fully counterclockwise
When a cutting flame has an excess of fuel, the flame is called a - ANSWER-Carburizing
When disassembling oxyfuel equipment, verify that all pressure gauges read ____ before starting to take
equipment apart. - ANSWER-0
When inspecting a completed cut made with oxyfuel cutting equipment, the drag lines of the cut should
be near ___ and not very pronounced. - ANSWER-Vertical
Once the size of a gasket or O-ring has been determined, ___ factors must be considered before
choosing a gasket or O-ring. - ANSWER-compatibility
The gasket that is made of stainless steel with a graphite insert is the ___ gasket. - ANSWER-Spiral wound
Natural rubber has limited chemical resistance to ___. - ANSWER-Petroleum products
The gasket material that is not recommended for water service and has poor chemical resistance is ___. -
ANSWER-Neoprene
, Which of the following substances would be compatible with a nitrile gasket? - ANSWER-Water or
alcohol
RTJ gaskets are used in ________ applications - ANSWER-high pressure
The radius of a bolt circle is equal to ___. - ANSWER-Half the diameter
In gasket making, bluing ink is used to_____. - ANSWER-transfer the flange impression to the gasket
material
When tightening the bolts on a circular multi bolt flange, you should start at 12'oclock and proceed
clockwise around the flange. - ANSWER-False
Graphite packings should not be used for applications
where____ is present. - ANSWER-Oxygen
TFE/synthetic fiber packing is used in ________. - ANSWER-caustic chemical applications
Packing rings are usually installed in a _____
on revolving equipment. - ANSWER-gland
When installing new packing, stagger the new cut end ___ from the cut end of the ring before it. -
ANSWER-180 degrees
The type of O-ring that can be used with most petroleum and silicone fluids, hydraulic fluids, and
solvents is ___. - ANSWER-Buna-N
The appropriate temperature range for ___ O-rings is -31 F to 400 F. - ANSWER-Viton
The purpose of a welding screen is to ___. - ANSWER-Control hot particles
AND CORRECT DETAILED ANSWERS
A good safety practice is - ANSWER-Writing HOT on hot metal before leaving it unattended
When pure oxygen is combined with fuel gases, the pure oxygen produces - ANSWER-A high
temperature flame needed for flame cutting
The smallest standard oxygen cylinder holds about ____ cubic feet of oxygen. - ANSWER-85
Acetylene gas must be withdrawn from a cylinder at an hourly rate that does not exceed _____ of the
cylinder capacity. - ANSWER-10 percent
Safety fuse plugs in the top and bottom of an acetylene cylinder are designed to ___. - ANSWER-release
acetylene gas in the event of a fire
methylacetylene propadiene (MAPP) gas, a liquefied fuel used in oxyfuek cutting, burns at temperatures
almost as high as acetylene and has the stability of ___ - ANSWER-Propane
The amount of liquefied gas remaining in a cylinder is determined by the ___ of the cylinder. - ANSWER-
Weight
The regulators used in fuel gas cylinders are often painted red and always have ____ on all connections. -
ANSWER-Left hand threads
The attachment on top of a fuel gas cylinder that allows the gas to flow in only one directions is called a -
ANSWER-Check valve
The cutting tips used with liquified fuel gases must have at least ___ preheat holes. - ANSWER-Six
When lifting oxyfuel cutting cylinders, always use a - ANSWER-cylinder cage
,To avoid injury from dirt that may be lodged in the valve and regulator seat of a gas cylinder, always
stand ___ the valve when opening the valve to clear the regulator seat. - ANSWER-To the side of
When clearing debris from new oxyfuel cutting
equipment hoses, blow the hoses out
with_____. - ANSWER-Nitrogen or argon
The first step in selecting a cutting tip is to - ANSWER-identify the thickness of the material to be cut
Before opening cylinder valves, verify that the adjusting screws on the oxygen and fuel gas regulators are
____. - ANSWER-Fully counterclockwise
When a cutting flame has an excess of fuel, the flame is called a - ANSWER-Carburizing
When disassembling oxyfuel equipment, verify that all pressure gauges read ____ before starting to take
equipment apart. - ANSWER-0
When inspecting a completed cut made with oxyfuel cutting equipment, the drag lines of the cut should
be near ___ and not very pronounced. - ANSWER-Vertical
Once the size of a gasket or O-ring has been determined, ___ factors must be considered before
choosing a gasket or O-ring. - ANSWER-compatibility
The gasket that is made of stainless steel with a graphite insert is the ___ gasket. - ANSWER-Spiral wound
Natural rubber has limited chemical resistance to ___. - ANSWER-Petroleum products
The gasket material that is not recommended for water service and has poor chemical resistance is ___. -
ANSWER-Neoprene
, Which of the following substances would be compatible with a nitrile gasket? - ANSWER-Water or
alcohol
RTJ gaskets are used in ________ applications - ANSWER-high pressure
The radius of a bolt circle is equal to ___. - ANSWER-Half the diameter
In gasket making, bluing ink is used to_____. - ANSWER-transfer the flange impression to the gasket
material
When tightening the bolts on a circular multi bolt flange, you should start at 12'oclock and proceed
clockwise around the flange. - ANSWER-False
Graphite packings should not be used for applications
where____ is present. - ANSWER-Oxygen
TFE/synthetic fiber packing is used in ________. - ANSWER-caustic chemical applications
Packing rings are usually installed in a _____
on revolving equipment. - ANSWER-gland
When installing new packing, stagger the new cut end ___ from the cut end of the ring before it. -
ANSWER-180 degrees
The type of O-ring that can be used with most petroleum and silicone fluids, hydraulic fluids, and
solvents is ___. - ANSWER-Buna-N
The appropriate temperature range for ___ O-rings is -31 F to 400 F. - ANSWER-Viton
The purpose of a welding screen is to ___. - ANSWER-Control hot particles
