PIPEFITTER STAR EXAM PART 1
Violent flashing and collapsing of vapor bubbles in a centrifugal pump is called. -
Answers :Cavitation
Device that controls the pressure in a low pressure steam boiler - Answers :Pressuretrol
Function of an evaporator - Answers :Absorb heat from the system
Metal which has a high iron content - Answers :ferrous
Why should the angle between the leg of a swing and the load never be less than 30
degrees? - Answers :More stress loads are applied on the sling
What are two kinds of misalignment that must be checked for when installing pumps? -
Answers :Parallel and angular alignment
What is the function of a compressor? - Answers :Create flow in the system
Vapor heated above its corresponding saturation temperature with no change in
pressure - Answers :Superheated
Magnetic field around a current carrying wire - Answers :Exists at all points long its
length
How many feet can a pump raise water vertically by suction - Answers :34 feet
What steps should be taken before starting a pump for the first time - Answers :Prime,
Check suction and discharge valves, Check rotation
Constant used to find offset or advance with 45 degree offset - Answers :.707
Pressure is - Answers :force per unit of area
Never expose any part of a compressed gas cylinder to temps above - Answers :125 F
What must be check on a boiler before putting it on line for the first time? - Answers
:Safety relief valve
An increase in pressure will cause the boiling temperature of a liquid to - Answers
:Increase
Function of a metering device in refrigeration - Answers :Regulates the flow of
refrigerant
, What is the function of a condeser - Answers :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 - Answers :Reheater
What percent of electricity is produced from power plants using steam? - Answers :90%
Two basic types of check valves - Answers :Lift and Swing
Maximum recommended service temperature of a brazed joint - Answers :350 F
Generates a small amount of voltage when heated - Answers :Thermocouple
Work is defined as - Answers :force times distance
Two main classifications of pumps - Answers :Positive Displacement and Non-positive
displacement
Thermostatic traps are opened and closed by - Answers :flexible bellows
In a float and thermostatic trap the float rises to discharge - Answers :Condensate
Current polarity becomes an important factor with ______ power sources - Answers :All
DC
DCRP (electrode positive) is produced when the electrode is connected to the ______
terminal of the welding power - Answers :Positive
In a constant current welding power source, the welding current remains relatively
constant despite changes in - Answers :Arc Length
Two most important valves in a boiler - Answers :Pressure reducing and pressure relief
valve
The expansion tank should always be installed on the ______ side of the pump -
Answers :Suction
The BTUH carry capacity of a pipe _______ as the velocity of the water in the pipe
increases. - Answers :Increases
Name 3 secondary refrigerants - Answers :Water, Brine, Glycol
Name of the unit that can heat and cool - Answers :Heat pump
Name of the odorant in natural gas and propane - Answers :Mercaptan
Violent flashing and collapsing of vapor bubbles in a centrifugal pump is called. -
Answers :Cavitation
Device that controls the pressure in a low pressure steam boiler - Answers :Pressuretrol
Function of an evaporator - Answers :Absorb heat from the system
Metal which has a high iron content - Answers :ferrous
Why should the angle between the leg of a swing and the load never be less than 30
degrees? - Answers :More stress loads are applied on the sling
What are two kinds of misalignment that must be checked for when installing pumps? -
Answers :Parallel and angular alignment
What is the function of a compressor? - Answers :Create flow in the system
Vapor heated above its corresponding saturation temperature with no change in
pressure - Answers :Superheated
Magnetic field around a current carrying wire - Answers :Exists at all points long its
length
How many feet can a pump raise water vertically by suction - Answers :34 feet
What steps should be taken before starting a pump for the first time - Answers :Prime,
Check suction and discharge valves, Check rotation
Constant used to find offset or advance with 45 degree offset - Answers :.707
Pressure is - Answers :force per unit of area
Never expose any part of a compressed gas cylinder to temps above - Answers :125 F
What must be check on a boiler before putting it on line for the first time? - Answers
:Safety relief valve
An increase in pressure will cause the boiling temperature of a liquid to - Answers
:Increase
Function of a metering device in refrigeration - Answers :Regulates the flow of
refrigerant
, What is the function of a condeser - Answers :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 - Answers :Reheater
What percent of electricity is produced from power plants using steam? - Answers :90%
Two basic types of check valves - Answers :Lift and Swing
Maximum recommended service temperature of a brazed joint - Answers :350 F
Generates a small amount of voltage when heated - Answers :Thermocouple
Work is defined as - Answers :force times distance
Two main classifications of pumps - Answers :Positive Displacement and Non-positive
displacement
Thermostatic traps are opened and closed by - Answers :flexible bellows
In a float and thermostatic trap the float rises to discharge - Answers :Condensate
Current polarity becomes an important factor with ______ power sources - Answers :All
DC
DCRP (electrode positive) is produced when the electrode is connected to the ______
terminal of the welding power - Answers :Positive
In a constant current welding power source, the welding current remains relatively
constant despite changes in - Answers :Arc Length
Two most important valves in a boiler - Answers :Pressure reducing and pressure relief
valve
The expansion tank should always be installed on the ______ side of the pump -
Answers :Suction
The BTUH carry capacity of a pipe _______ as the velocity of the water in the pipe
increases. - Answers :Increases
Name 3 secondary refrigerants - Answers :Water, Brine, Glycol
Name of the unit that can heat and cool - Answers :Heat pump
Name of the odorant in natural gas and propane - Answers :Mercaptan
