MSSC-M4 MAINTENANCE AWARENESS
EXAM QUESTIONS AND ANSWERS 2026
VERIFIED.
__________ metal is a metal similar in composition to the metal being joined. It strengthens the
weld by filling the gap created between the two pieces of metal during welding.
- Joiner
- Filler
- Wadding
- Lap - ANS Filler
Metals that contain iron, such as mild steel, are called __________ metals.
- Soft
- Heavy
- Base
- Ferrous - ANS Ferrous
A green welding hose normally indicates that this hose carries __________
.- Acetylene
- Oxygen
@2026/2027 ALLRIGHTS RESERVED.
,- Helium
- Nitrogen - ANS Oxygen
Oxy-acetylene welding requires no __________.
- Gas
- Torch
- Electricity
- Filler rod - ANS Electricity
Metals treated by __________ processes become soft.
- Annealing
- Quenching
- Stamping
- Twisting - ANS Annealing
Dirt and other foreign material should be cleaned out of an oxygen cylinder before installing a
regulator. By what method should this be done?
- The cylinder should be wiped out with a rag
- The cylinder valve should be cracked open slightly and then closed completely
- Using a pneumatic air gun
- Using a wire brush - ANS The cylinder valve should be cracked open slightly and then closed
completely
What device should be stored a minimum of 20 feet from flammable materials?
- Nitrogen Cylinders
- Micrometers
@2026/2027 ALLRIGHTS RESERVED.
,- Machine Tools
- Oxygen Cylinders - ANS - Oxygen Cylinders
The gas metal arc welding (GMAW) process uses __________ to melt metal wire and fuse it
with the base metal being welded.
- Electricity
- Oxygen
- Acetylene
- Tungsten - ANS Electricity
Metals that contain iron, such as steel, have __________ properties.
- Porous
- Magnetic
- Spongy
- Kinetic - ANS Magnetic
A magnaflux test is used to show what flaw in ferrous metal?
- Flatness
- Hardness
- Cracks in the surface
- Magnetism - ANS Cracks in the surface
Metals that contain iron, such as steel are called __________ metals
.- Ferrous
- Soft
@2026/2027 ALLRIGHTS RESERVED.
, - Base
- Heavy - ANS Ferrous
Torches are designed to avoid mixing oxygen and acetylene by using __________.
- Reverse-flow check valves at torch inlets or regulator outlets
- Separate valves
- Lower oxygen pressure
- Torch anti-mixing valve - ANS Reverse-flow check valves at torch inlets or regulator outlets
An explosion can occur if __________ comes in contact with oil.
- High pressure oxygen
- High pressure nitrogen
- High speed shaft
- High speed pump - ANS High pressure oxygen
A spot welding system consists of an electrical supply, moveable arm, and a(n) __________.
- Encoder
- Filler rod
- Stationary arm
- Stationary roller - ANS Stationary arm
To prevent leakage around the valve during use, __________.
- Acetylene pressure should be equalized
- A full flow of oxygen should be established
- An oxygen cylinder valve should be opened all the way
@2026/2027 ALLRIGHTS RESERVED.
EXAM QUESTIONS AND ANSWERS 2026
VERIFIED.
__________ metal is a metal similar in composition to the metal being joined. It strengthens the
weld by filling the gap created between the two pieces of metal during welding.
- Joiner
- Filler
- Wadding
- Lap - ANS Filler
Metals that contain iron, such as mild steel, are called __________ metals.
- Soft
- Heavy
- Base
- Ferrous - ANS Ferrous
A green welding hose normally indicates that this hose carries __________
.- Acetylene
- Oxygen
@2026/2027 ALLRIGHTS RESERVED.
,- Helium
- Nitrogen - ANS Oxygen
Oxy-acetylene welding requires no __________.
- Gas
- Torch
- Electricity
- Filler rod - ANS Electricity
Metals treated by __________ processes become soft.
- Annealing
- Quenching
- Stamping
- Twisting - ANS Annealing
Dirt and other foreign material should be cleaned out of an oxygen cylinder before installing a
regulator. By what method should this be done?
- The cylinder should be wiped out with a rag
- The cylinder valve should be cracked open slightly and then closed completely
- Using a pneumatic air gun
- Using a wire brush - ANS The cylinder valve should be cracked open slightly and then closed
completely
What device should be stored a minimum of 20 feet from flammable materials?
- Nitrogen Cylinders
- Micrometers
@2026/2027 ALLRIGHTS RESERVED.
,- Machine Tools
- Oxygen Cylinders - ANS - Oxygen Cylinders
The gas metal arc welding (GMAW) process uses __________ to melt metal wire and fuse it
with the base metal being welded.
- Electricity
- Oxygen
- Acetylene
- Tungsten - ANS Electricity
Metals that contain iron, such as steel, have __________ properties.
- Porous
- Magnetic
- Spongy
- Kinetic - ANS Magnetic
A magnaflux test is used to show what flaw in ferrous metal?
- Flatness
- Hardness
- Cracks in the surface
- Magnetism - ANS Cracks in the surface
Metals that contain iron, such as steel are called __________ metals
.- Ferrous
- Soft
@2026/2027 ALLRIGHTS RESERVED.
, - Base
- Heavy - ANS Ferrous
Torches are designed to avoid mixing oxygen and acetylene by using __________.
- Reverse-flow check valves at torch inlets or regulator outlets
- Separate valves
- Lower oxygen pressure
- Torch anti-mixing valve - ANS Reverse-flow check valves at torch inlets or regulator outlets
An explosion can occur if __________ comes in contact with oil.
- High pressure oxygen
- High pressure nitrogen
- High speed shaft
- High speed pump - ANS High pressure oxygen
A spot welding system consists of an electrical supply, moveable arm, and a(n) __________.
- Encoder
- Filler rod
- Stationary arm
- Stationary roller - ANS Stationary arm
To prevent leakage around the valve during use, __________.
- Acetylene pressure should be equalized
- A full flow of oxygen should be established
- An oxygen cylinder valve should be opened all the way
@2026/2027 ALLRIGHTS RESERVED.
