PIPEFITTER NCCER 2026 CORE EXAM TEST QUESTIONS
AND ANSWERS GRADED A+
✔✔How many feet can a pump raise water vertically by suction - ✔✔34 feet
✔✔What steps should be taken before starting a pump for the first time - ✔✔Prime,
Check suction and discharge valves, Check rotation
✔✔Constant used to find offset or advance with 45 degree offset - ✔✔.707
✔✔Pressure is - ✔✔force per unit of area
✔✔Never expose any part of a compressed gas cylinder to temps above - ✔✔125 F
✔✔What must be check on a boiler before putting it on line for the first time? -
✔✔Safety relief valve
✔✔An increase in pressure will cause the boiling temperature of a liquid to -
✔✔Increase
✔✔Function of a metering device in refrigeration - ✔✔Regulates the flow of refrigerant
✔✔What is the function of a condeser - ✔✔Reject heat from the refrigerant
✔✔Portion of the boiler which increaes the temperature of the steam so that it doesn't
condense in the turbine - ✔✔Reheater
✔✔What percent of electricity is produced from power plants using steam? - ✔✔90%
✔✔Two basic types of check valves - ✔✔Lift and Swing
✔✔Maximum recommended service temperature of a brazed joint - ✔✔350 F
✔✔Generates a small amount of voltage when heated - ✔✔Thermocouple
✔✔Work is defined as - ✔✔force times distance
✔✔Two main classifications of pumps - ✔✔Positive Displacement and Non-positive
displacement
✔✔Thermostatic traps are opened and closed by - ✔✔flexible bellows
✔✔In a float and thermostatic trap the float rises to discharge - ✔✔Condensate
, ✔✔Current polarity becomes an important factor with ______ power sources - ✔✔All
DC
✔✔DCRP (electrode positive) is produced when the electrode is connected to the
______ terminal of the welding power - ✔✔Positive
✔✔In a constant current welding power source, the welding current remains relatively
constant despite changes in - ✔✔Arc Length
✔✔Two most important valves in a boiler - ✔✔Pressure reducing and pressure relief
valve
✔✔The expansion tank should always be installed on the ______ side of the pump -
✔✔Suction
✔✔The BTUH carry capacity of a pipe _______ as the velocity of the water in the pipe
increases. - ✔✔Increases
✔✔Name 3 secondary refrigerants - ✔✔Water, Brine, Glycol
✔✔Name of the unit that can heat and cool - ✔✔Heat pump
✔✔Name of the odorant in natural gas and propane - ✔✔Mercaptan
✔✔Normally Open (NO) and Normally Closed (NC) indicate the state of a switch when it
is: - ✔✔De-Energized
✔✔The measurement unit used to express the rate of flow, refers to the: - ✔✔Velocity
✔✔What is a device that changes a voltage signal to a current signal? - ✔✔E/I
transducer
✔✔Pipe is made in which of the following sizes: - ✔✔1/8" to 48"
✔✔Copper tube is designated as types: - ✔✔K, L, M, ACR, DWV
✔✔Name of all segments of dies used for cutting threads - ✔✔Chasers
✔✔Formula for calculating step ahead in a parallel offset - ✔✔.414 x equal spread
✔✔Device which forma a water seal that prevents raw steam from entering and
damaging pressure gauges: - ✔✔Pigtail
AND ANSWERS GRADED A+
✔✔How many feet can a pump raise water vertically by suction - ✔✔34 feet
✔✔What steps should be taken before starting a pump for the first time - ✔✔Prime,
Check suction and discharge valves, Check rotation
✔✔Constant used to find offset or advance with 45 degree offset - ✔✔.707
✔✔Pressure is - ✔✔force per unit of area
✔✔Never expose any part of a compressed gas cylinder to temps above - ✔✔125 F
✔✔What must be check on a boiler before putting it on line for the first time? -
✔✔Safety relief valve
✔✔An increase in pressure will cause the boiling temperature of a liquid to -
✔✔Increase
✔✔Function of a metering device in refrigeration - ✔✔Regulates the flow of refrigerant
✔✔What is the function of a condeser - ✔✔Reject heat from the refrigerant
✔✔Portion of the boiler which increaes the temperature of the steam so that it doesn't
condense in the turbine - ✔✔Reheater
✔✔What percent of electricity is produced from power plants using steam? - ✔✔90%
✔✔Two basic types of check valves - ✔✔Lift and Swing
✔✔Maximum recommended service temperature of a brazed joint - ✔✔350 F
✔✔Generates a small amount of voltage when heated - ✔✔Thermocouple
✔✔Work is defined as - ✔✔force times distance
✔✔Two main classifications of pumps - ✔✔Positive Displacement and Non-positive
displacement
✔✔Thermostatic traps are opened and closed by - ✔✔flexible bellows
✔✔In a float and thermostatic trap the float rises to discharge - ✔✔Condensate
, ✔✔Current polarity becomes an important factor with ______ power sources - ✔✔All
DC
✔✔DCRP (electrode positive) is produced when the electrode is connected to the
______ terminal of the welding power - ✔✔Positive
✔✔In a constant current welding power source, the welding current remains relatively
constant despite changes in - ✔✔Arc Length
✔✔Two most important valves in a boiler - ✔✔Pressure reducing and pressure relief
valve
✔✔The expansion tank should always be installed on the ______ side of the pump -
✔✔Suction
✔✔The BTUH carry capacity of a pipe _______ as the velocity of the water in the pipe
increases. - ✔✔Increases
✔✔Name 3 secondary refrigerants - ✔✔Water, Brine, Glycol
✔✔Name of the unit that can heat and cool - ✔✔Heat pump
✔✔Name of the odorant in natural gas and propane - ✔✔Mercaptan
✔✔Normally Open (NO) and Normally Closed (NC) indicate the state of a switch when it
is: - ✔✔De-Energized
✔✔The measurement unit used to express the rate of flow, refers to the: - ✔✔Velocity
✔✔What is a device that changes a voltage signal to a current signal? - ✔✔E/I
transducer
✔✔Pipe is made in which of the following sizes: - ✔✔1/8" to 48"
✔✔Copper tube is designated as types: - ✔✔K, L, M, ACR, DWV
✔✔Name of all segments of dies used for cutting threads - ✔✔Chasers
✔✔Formula for calculating step ahead in a parallel offset - ✔✔.414 x equal spread
✔✔Device which forma a water seal that prevents raw steam from entering and
damaging pressure gauges: - ✔✔Pigtail
