Page 1 of 116
PIPEFITTER STAR EXAM 1&2 COMPLETE 500
QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR
PIPEFITTER STAR EXAM
QUESTION: Which of the following gases is used as a shielding gas for GT AW?
a. Oxygen
b. Argon
c. Carbon dioxide
d. Compressed air - ANSWER-b. Argon
QUESTION: What are the main differences if any, between soldering and brazing?
a. In cleaning only; soldering requires typical cleaning while brazing requires none
b. There are no differences
c. The in-service requirements, brazed joints on refrigeration and medical gases, all other
services are soldered
1
,Page 2 of 116
d. Differences are the fluxes, the temperature at which the joints are made, and the
pressures/temperatures of the service - ANSWER-d. Differences are the fluxes, the temperature
at which the joints are made, and the pressures/temperatures of the service
QUESTION: How is capillary action defined?
a. Melting of filler metal to solder and/or braze a cup joint
b. Wetting action caused by the heating of flux
c. Flow of a liquid when drawn to a small space
d. Adhesion of filler metal to copper tube joints - ANSWER-c. Flow of a liquid when drawn to a
small space
QUESTION: What does the annealing process do to copper?
a. hardens
b. melts
c. softens
d. weakness - ANSWER-c. softensWhy may flux be omitted when brazing copper tube to
wrought copper fittings?
2
,Page 3 of 116
a. this is not a true statement; flux must always be used
b. The temperature at which brazing is done eliminates the need for flux
c. The flux is in the copper tube and fittings
d. The filler metal is self fluxing - ANSWER-d. The filler metal is self fluxing
QUESTION: What weld position is the 45 degree test weld position?
a. 1G
b. 2G
c. 5G
D. 6G - ANSWER-d. 6G
QUESTION: What is the primary function of a flux?
a. To create capillary action
b. To lubricate tube ends to aid in cup fitting installation
c. To chemically clean the surfaces to be soldered or brazed
d. To chemically bond the pieces to be joined - ANSWER-c. To chemically clean the surfaces to
be soldered or brazed
3
, Page 4 of 116
QUESTION: When a soldered joint becomes overheated,
a. The solder will melt more rapidly and fill the cup more evenly
b. The flux will burn, causing it to become ineffective
c. The flux will burn, but the joint is not effected
d. Switch to a brazing filler metal and continue - ANSWER-b. The flux will burn, causing it to
become ineffective
QUESTION: What does the "G" indicate in 2G, 5G, and 6G, weld positions
a. Groove
b. Gap
c. Group
d. Gauge - ANSWER-a. Groove
QUESTION: Soldered joints are not recommended for copper tube installation when the service
temperature will exceed
a. 250F
4
PIPEFITTER STAR EXAM 1&2 COMPLETE 500
QUESTIONS AND DETAILED SOLUTIONS LATEST
UPDATE THIS YEAR
PIPEFITTER STAR EXAM
QUESTION: Which of the following gases is used as a shielding gas for GT AW?
a. Oxygen
b. Argon
c. Carbon dioxide
d. Compressed air - ANSWER-b. Argon
QUESTION: What are the main differences if any, between soldering and brazing?
a. In cleaning only; soldering requires typical cleaning while brazing requires none
b. There are no differences
c. The in-service requirements, brazed joints on refrigeration and medical gases, all other
services are soldered
1
,Page 2 of 116
d. Differences are the fluxes, the temperature at which the joints are made, and the
pressures/temperatures of the service - ANSWER-d. Differences are the fluxes, the temperature
at which the joints are made, and the pressures/temperatures of the service
QUESTION: How is capillary action defined?
a. Melting of filler metal to solder and/or braze a cup joint
b. Wetting action caused by the heating of flux
c. Flow of a liquid when drawn to a small space
d. Adhesion of filler metal to copper tube joints - ANSWER-c. Flow of a liquid when drawn to a
small space
QUESTION: What does the annealing process do to copper?
a. hardens
b. melts
c. softens
d. weakness - ANSWER-c. softensWhy may flux be omitted when brazing copper tube to
wrought copper fittings?
2
,Page 3 of 116
a. this is not a true statement; flux must always be used
b. The temperature at which brazing is done eliminates the need for flux
c. The flux is in the copper tube and fittings
d. The filler metal is self fluxing - ANSWER-d. The filler metal is self fluxing
QUESTION: What weld position is the 45 degree test weld position?
a. 1G
b. 2G
c. 5G
D. 6G - ANSWER-d. 6G
QUESTION: What is the primary function of a flux?
a. To create capillary action
b. To lubricate tube ends to aid in cup fitting installation
c. To chemically clean the surfaces to be soldered or brazed
d. To chemically bond the pieces to be joined - ANSWER-c. To chemically clean the surfaces to
be soldered or brazed
3
, Page 4 of 116
QUESTION: When a soldered joint becomes overheated,
a. The solder will melt more rapidly and fill the cup more evenly
b. The flux will burn, causing it to become ineffective
c. The flux will burn, but the joint is not effected
d. Switch to a brazing filler metal and continue - ANSWER-b. The flux will burn, causing it to
become ineffective
QUESTION: What does the "G" indicate in 2G, 5G, and 6G, weld positions
a. Groove
b. Gap
c. Group
d. Gauge - ANSWER-a. Groove
QUESTION: Soldered joints are not recommended for copper tube installation when the service
temperature will exceed
a. 250F
4
