PIPEFITTER STAR EXAM – COMPLETE 500 QUESTIONS
WITH DETAILED ANSWERS | LATEST 2026 UPDATE |
FULL PRACTICE EXAM WITH VERIFIED MOST TESTED
SOLUTIONS
Pressure is: - SELECTED ANSWER 👀 force per unit of area
Work is defined as: - SELECTED ANSWER 👀 force times distance
Name the two main classifications of pump types. - SELECTED ANSWER 👀
Positive Displacement pumps and Non-Positive Displacement pumps
The violent flashing and collapsing of vapor bubbles in a centrifugal pump is
called? - SELECTED ANSWER 👀 Cavitation
What are two kinds of misalignment that must be checked for when installing
pumps - SELECTED ANSWER 👀 Parallel and Angular alignment
What steps should be taken before starting a pump for the first time? - SELECTED
ANSWER 👀 Prime, Check suction and discharge valves, Check rotation
What are two of the three main items shown on a pump curve? - SELECTED
ANSWER 👀 Head in Feet and GPM
Theoretically, how many feet can a pump can raise water vertically by suction? -
SELECTED ANSWER 👀 34 feet
The welder is at most serious and immediate risk of - SELECTED ANSWER 👀
electrocution
The first two digits on welding rod indicate? - SELECTED ANSWER 👀 tensile
strength
,The next to last digit indicates the ____________ of the weld. - SELECTED
ANSWER 👀 position
Utilizing the piping drawing, calculate the measurements for "B": - SELECTED
ANSWER 👀 5' - 5"
Utilizing the piping drawing, calculate the measurements for "D": - SELECTED
ANSWER 👀 32' - 3"
Utilizing the piping drawing, calculate the measurements for "K": - SELECTED
ANSWER 👀 10' - 8"
Utilizing the piping drawing, calculate the measurements for "N": - SELECTED
ANSWER 👀 24' - 2"
Utilizing the piping drawing, calculate the measurements for "V": - SELECTED
ANSWER 👀 6' - 8"
Utilizing the piping drawing, calculate the measurements for "T": - SELECTED
ANSWER 👀 2' - 0"
An increase in pressure will cause the boiling temperature of a liquid to: -
SELECTED ANSWER 👀 Increase
The device that controls the pressure in a low-pressure steam boiler is called
a/an: - SELECTED ANSWER 👀 Pressuretrol
The two basic types of low-water cutoffs are: - SELECTED ANSWER 👀 Float type
and electric probe type
Thermostatic traps are opened and closed by: - SELECTED ANSWER 👀 A flexible
bellows
In a float and thermostatic trap the float rises to discharge: - SELECTED ANSWER
👀 Condensate
,Condensate in steam lines could result in: - SELECTED ANSWER 👀 Water
hammer
The 4 main components in a refrigeration system are: - SELECTED ANSWER 👀
Compressor, Condenser, Evaporator, Metering device
What is the function of a metering device? - SELECTED ANSWER 👀 Regulates
the flow of refrigerant.
What is the function of an evaporator? - SELECTED ANSWER 👀 Absorb heat
from the system.
What is the function of a compressor? - SELECTED ANSWER 👀 Create flow in the
system.
What is the function of a condenser? - SELECTED ANSWER 👀 Reject heat from
the refrigerant.
A vapor heated above its corresponding saturation temperature with no change
in pressure is: - SELECTED ANSWER 👀 Superheated
What does the "R" which is stamped on all tube benders represent? - SELECTED
ANSWER 👀 Right
When your first bend is 3" end to center, where do you mark your tube? -
SELECTED ANSWER 👀 3"
Current polarity becomes an important factor with _______ power sources. -
SELECTED ANSWER 👀 All DC
DCRP is produced when the electrode is connected to the positive terminal of the
welding power source. - SELECTED ANSWER 👀 True
In a constant current welding power source, the welding current remains
relatively constant despite considerable changes in __________? - SELECTED
ANSWER 👀 Arc length
, A metal which has a high iron content is known as a _______ metal. - SELECTED
ANSWER 👀 Ferrous
What are the 2 most important valves on a boiler? - SELECTED ANSWER 👀
Pressure Reducing valve & pressure relief valve
The expansion tank should always be installed ________ the pump? - SELECTED
ANSWER 👀 On the suction side of
The BTUH carrying capacity of a pipe _________ as the velocity of the water in
the pipe increases. - SELECTED ANSWER 👀 Increases
The relief valve is sized to the _______ rating of the boiler. - SELECTED ANSWER
👀 Gross output
How many GPM must be circulate for every 10,000 BTUH of heat emission on a
boiler. - SELECTED ANSWER 👀 1
Name 3 secondary refrigerants: - SELECTED ANSWER 👀 Water, Brine, Glycol
What is the name of the unit that can heat and cool? - SELECTED ANSWER 👀
Heat pump
Name the odorant used in natural gas and propane. - SELECTED ANSWER 👀
Mercaptan
What do the 3 sides of the combustion triangle represent? - SELECTED ANSWER
👀 Fuel, oxygen, and heat
What are the names of the harmful products of incomplete combustion? -
SELECTED ANSWER 👀 Carbon monoxide & Aldehydes
In the U.S. what percent of electricity is produced from power plants using steam?
- SELECTED ANSWER 👀 90%
WITH DETAILED ANSWERS | LATEST 2026 UPDATE |
FULL PRACTICE EXAM WITH VERIFIED MOST TESTED
SOLUTIONS
Pressure is: - SELECTED ANSWER 👀 force per unit of area
Work is defined as: - SELECTED ANSWER 👀 force times distance
Name the two main classifications of pump types. - SELECTED ANSWER 👀
Positive Displacement pumps and Non-Positive Displacement pumps
The violent flashing and collapsing of vapor bubbles in a centrifugal pump is
called? - SELECTED ANSWER 👀 Cavitation
What are two kinds of misalignment that must be checked for when installing
pumps - SELECTED ANSWER 👀 Parallel and Angular alignment
What steps should be taken before starting a pump for the first time? - SELECTED
ANSWER 👀 Prime, Check suction and discharge valves, Check rotation
What are two of the three main items shown on a pump curve? - SELECTED
ANSWER 👀 Head in Feet and GPM
Theoretically, how many feet can a pump can raise water vertically by suction? -
SELECTED ANSWER 👀 34 feet
The welder is at most serious and immediate risk of - SELECTED ANSWER 👀
electrocution
The first two digits on welding rod indicate? - SELECTED ANSWER 👀 tensile
strength
,The next to last digit indicates the ____________ of the weld. - SELECTED
ANSWER 👀 position
Utilizing the piping drawing, calculate the measurements for "B": - SELECTED
ANSWER 👀 5' - 5"
Utilizing the piping drawing, calculate the measurements for "D": - SELECTED
ANSWER 👀 32' - 3"
Utilizing the piping drawing, calculate the measurements for "K": - SELECTED
ANSWER 👀 10' - 8"
Utilizing the piping drawing, calculate the measurements for "N": - SELECTED
ANSWER 👀 24' - 2"
Utilizing the piping drawing, calculate the measurements for "V": - SELECTED
ANSWER 👀 6' - 8"
Utilizing the piping drawing, calculate the measurements for "T": - SELECTED
ANSWER 👀 2' - 0"
An increase in pressure will cause the boiling temperature of a liquid to: -
SELECTED ANSWER 👀 Increase
The device that controls the pressure in a low-pressure steam boiler is called
a/an: - SELECTED ANSWER 👀 Pressuretrol
The two basic types of low-water cutoffs are: - SELECTED ANSWER 👀 Float type
and electric probe type
Thermostatic traps are opened and closed by: - SELECTED ANSWER 👀 A flexible
bellows
In a float and thermostatic trap the float rises to discharge: - SELECTED ANSWER
👀 Condensate
,Condensate in steam lines could result in: - SELECTED ANSWER 👀 Water
hammer
The 4 main components in a refrigeration system are: - SELECTED ANSWER 👀
Compressor, Condenser, Evaporator, Metering device
What is the function of a metering device? - SELECTED ANSWER 👀 Regulates
the flow of refrigerant.
What is the function of an evaporator? - SELECTED ANSWER 👀 Absorb heat
from the system.
What is the function of a compressor? - SELECTED ANSWER 👀 Create flow in the
system.
What is the function of a condenser? - SELECTED ANSWER 👀 Reject heat from
the refrigerant.
A vapor heated above its corresponding saturation temperature with no change
in pressure is: - SELECTED ANSWER 👀 Superheated
What does the "R" which is stamped on all tube benders represent? - SELECTED
ANSWER 👀 Right
When your first bend is 3" end to center, where do you mark your tube? -
SELECTED ANSWER 👀 3"
Current polarity becomes an important factor with _______ power sources. -
SELECTED ANSWER 👀 All DC
DCRP is produced when the electrode is connected to the positive terminal of the
welding power source. - SELECTED ANSWER 👀 True
In a constant current welding power source, the welding current remains
relatively constant despite considerable changes in __________? - SELECTED
ANSWER 👀 Arc length
, A metal which has a high iron content is known as a _______ metal. - SELECTED
ANSWER 👀 Ferrous
What are the 2 most important valves on a boiler? - SELECTED ANSWER 👀
Pressure Reducing valve & pressure relief valve
The expansion tank should always be installed ________ the pump? - SELECTED
ANSWER 👀 On the suction side of
The BTUH carrying capacity of a pipe _________ as the velocity of the water in
the pipe increases. - SELECTED ANSWER 👀 Increases
The relief valve is sized to the _______ rating of the boiler. - SELECTED ANSWER
👀 Gross output
How many GPM must be circulate for every 10,000 BTUH of heat emission on a
boiler. - SELECTED ANSWER 👀 1
Name 3 secondary refrigerants: - SELECTED ANSWER 👀 Water, Brine, Glycol
What is the name of the unit that can heat and cool? - SELECTED ANSWER 👀
Heat pump
Name the odorant used in natural gas and propane. - SELECTED ANSWER 👀
Mercaptan
What do the 3 sides of the combustion triangle represent? - SELECTED ANSWER
👀 Fuel, oxygen, and heat
What are the names of the harmful products of incomplete combustion? -
SELECTED ANSWER 👀 Carbon monoxide & Aldehydes
In the U.S. what percent of electricity is produced from power plants using steam?
- SELECTED ANSWER 👀 90%
