Pipefitter Star Exam Study Guide Questions With
Well Elaborated Solutions
What are two kinds of misalignment that must be checked for when installing
pumps - ANSWER -Parallel and Angular alignment
What steps should be taken before starting a pump for the first time? - ANSWER
-Prime, Check suction and discharge valves, Check rotation
What are two of the three main items shown on a pump curve? - ANSWER -Head
in Feet and GPM
Theoretically, how many feet can a pump can raise water vertically by suction? -
ANSWER -34 feet
The welder is at most serious and immediate risk of - ANSWER -electrocution
The first two digits on welding rod indicate? - ANSWER -tensile strength
The next to last digit indicates the ____________ of the weld. - ANSWER -
position
Utilizing the piping drawing, calculate the measurements for "B": - ANSWER -5'
- 5"
Utilizing the piping drawing, calculate the measurements for "D": - ANSWER -
32' - 3"
Utilizing the piping drawing, calculate the measurements for "K": - ANSWER -
10' - 8"
Utilizing the piping drawing, calculate the measurements for "N": - ANSWER -
24' - 2"
Utilizing the piping drawing, calculate the measurements for "V": - ANSWER -6'
- 8"
Utilizing the piping drawing, calculate the measurements for "T": - ANSWER -2'
- 0"
,An increase in pressure will cause the boiling temperature of a liquid to: -
ANSWER -Increase
The device that controls the pressure in a low-pressure steam boiler is called a/an:
- ANSWER -Pressuretrol
The two basic types of low-water cutoffs are: - ANSWER -Float type and electric
probe type
Thermostatic traps are opened and closed by: - ANSWER -A flexible bellows
In a float and thermostatic trap the float rises to discharge: - ANSWER -
Condensate
Condensate in steam lines could result in: - ANSWER -Water hammer
The 4 main components in a refrigeration system are: - ANSWER -Compressor,
Condenser, Evaporator, Metering device
What is the function of a metering device? - ANSWER -Regulates the flow of
refrigerant.
What is the function of an evaporator? - ANSWER -Absorb heat from the system.
What is the function of a compressor? - ANSWER -Create flow in the system.
What is the function of a condenser? - ANSWER -Reject heat from the
refrigerant.
A vapor heated above its corresponding saturation temperature with no change in
pressure is: - ANSWER -Superheated
What does the "R" which is stamped on all tube benders represent? - ANSWER -
Right
When your first bend is 3" end to center, where do you mark your tube? -
ANSWER -3"
,Current polarity becomes an important factor with _______ power sources. -
ANSWER -All DC
DCRP is produced when the electrode is connected to the positive terminal of the
welding power source. - ANSWER -True
In a constant current welding power source, the welding current remains relatively
constant despite considerable changes in __________? - ANSWER -Arc length
A metal which has a high iron content is known as a _______ metal. - ANSWER
-Ferrous
What are the 2 most important valves on a boiler? - ANSWER -Pressure
Reducing valve & pressure relief valve
The expansion tank should always be installed ________ the pump? - ANSWER -
On the suction side of
The BTUH carrying capacity of a pipe _________ as the velocity of the water in
the pipe increases. - ANSWER -Increases
The relief valve is sized to the _______ rating of the boiler. - ANSWER -Gross
output
How many GPM must be circulate for every 10,000 BTUH of heat emission on a
boiler. - ANSWER -1
Name 3 secondary refrigerants: - ANSWER -Water, Brine, Glycol
What is the name of the unit that can heat and cool? - ANSWER -Heat pump
Name the odorant used in natural gas and propane. - ANSWER -Mercaptan
What do the 3 sides of the combustion triangle represent? - ANSWER -Fuel,
oxygen, and heat
What are the names of the harmful products of incomplete combustion? -
ANSWER -Carbon monoxide & Aldehydes
, In the U.S. what percent of electricity is produced from power plants using steam?
- ANSWER -90%
What is the main advantage of a fluidized bed boiler? - ANSWER -Low SO &
NOx emissions
What must be checked on a boiler before putting it on line for the first time? -
ANSWER -Safety Relief Valve
Name the portion of the boiler which increase the temperature of the steam so that
it does not condense in the turbine. - ANSWER -Reheater
Name the heat-transfer surface that transfer heat from the flue gas to the boiler
feedwater. - ANSWER -Economizer
Name the heat-transfer surface that raises the steam temperature above it
corresponding saturation temperature. - ANSWER -Superheater
Name the device used for collecting dust from a flue gas stream. - ANSWER -
Electrostatic Precipitator
Normally Open (NO) and Normally Closed (NC) indicate the state of a switch
when it is: - ANSWER -De-Energized
The measurement unit used to express the rate of flow, refers to the: - ANSWER -
Velocity
What is a device that changes a voltage signal to a current signal? - ANSWER -
E/I transducer
A number value on a pH scale indicates the: - ANSWER -Acidity or alkalinity of
a chemical
As the temperature rises in a closed vessel the pressure: - ANSWER -Increases
USING THE 4 TO 1 RULE THE DISTANCE OUT FROM A WALL THE
LADDER SHOULD BE IF THE WORKING LENGTH IS 16FT WOULD BE? -
ANSWER -4FT
Well Elaborated Solutions
What are two kinds of misalignment that must be checked for when installing
pumps - ANSWER -Parallel and Angular alignment
What steps should be taken before starting a pump for the first time? - ANSWER
-Prime, Check suction and discharge valves, Check rotation
What are two of the three main items shown on a pump curve? - ANSWER -Head
in Feet and GPM
Theoretically, how many feet can a pump can raise water vertically by suction? -
ANSWER -34 feet
The welder is at most serious and immediate risk of - ANSWER -electrocution
The first two digits on welding rod indicate? - ANSWER -tensile strength
The next to last digit indicates the ____________ of the weld. - ANSWER -
position
Utilizing the piping drawing, calculate the measurements for "B": - ANSWER -5'
- 5"
Utilizing the piping drawing, calculate the measurements for "D": - ANSWER -
32' - 3"
Utilizing the piping drawing, calculate the measurements for "K": - ANSWER -
10' - 8"
Utilizing the piping drawing, calculate the measurements for "N": - ANSWER -
24' - 2"
Utilizing the piping drawing, calculate the measurements for "V": - ANSWER -6'
- 8"
Utilizing the piping drawing, calculate the measurements for "T": - ANSWER -2'
- 0"
,An increase in pressure will cause the boiling temperature of a liquid to: -
ANSWER -Increase
The device that controls the pressure in a low-pressure steam boiler is called a/an:
- ANSWER -Pressuretrol
The two basic types of low-water cutoffs are: - ANSWER -Float type and electric
probe type
Thermostatic traps are opened and closed by: - ANSWER -A flexible bellows
In a float and thermostatic trap the float rises to discharge: - ANSWER -
Condensate
Condensate in steam lines could result in: - ANSWER -Water hammer
The 4 main components in a refrigeration system are: - ANSWER -Compressor,
Condenser, Evaporator, Metering device
What is the function of a metering device? - ANSWER -Regulates the flow of
refrigerant.
What is the function of an evaporator? - ANSWER -Absorb heat from the system.
What is the function of a compressor? - ANSWER -Create flow in the system.
What is the function of a condenser? - ANSWER -Reject heat from the
refrigerant.
A vapor heated above its corresponding saturation temperature with no change in
pressure is: - ANSWER -Superheated
What does the "R" which is stamped on all tube benders represent? - ANSWER -
Right
When your first bend is 3" end to center, where do you mark your tube? -
ANSWER -3"
,Current polarity becomes an important factor with _______ power sources. -
ANSWER -All DC
DCRP is produced when the electrode is connected to the positive terminal of the
welding power source. - ANSWER -True
In a constant current welding power source, the welding current remains relatively
constant despite considerable changes in __________? - ANSWER -Arc length
A metal which has a high iron content is known as a _______ metal. - ANSWER
-Ferrous
What are the 2 most important valves on a boiler? - ANSWER -Pressure
Reducing valve & pressure relief valve
The expansion tank should always be installed ________ the pump? - ANSWER -
On the suction side of
The BTUH carrying capacity of a pipe _________ as the velocity of the water in
the pipe increases. - ANSWER -Increases
The relief valve is sized to the _______ rating of the boiler. - ANSWER -Gross
output
How many GPM must be circulate for every 10,000 BTUH of heat emission on a
boiler. - ANSWER -1
Name 3 secondary refrigerants: - ANSWER -Water, Brine, Glycol
What is the name of the unit that can heat and cool? - ANSWER -Heat pump
Name the odorant used in natural gas and propane. - ANSWER -Mercaptan
What do the 3 sides of the combustion triangle represent? - ANSWER -Fuel,
oxygen, and heat
What are the names of the harmful products of incomplete combustion? -
ANSWER -Carbon monoxide & Aldehydes
, In the U.S. what percent of electricity is produced from power plants using steam?
- ANSWER -90%
What is the main advantage of a fluidized bed boiler? - ANSWER -Low SO &
NOx emissions
What must be checked on a boiler before putting it on line for the first time? -
ANSWER -Safety Relief Valve
Name the portion of the boiler which increase the temperature of the steam so that
it does not condense in the turbine. - ANSWER -Reheater
Name the heat-transfer surface that transfer heat from the flue gas to the boiler
feedwater. - ANSWER -Economizer
Name the heat-transfer surface that raises the steam temperature above it
corresponding saturation temperature. - ANSWER -Superheater
Name the device used for collecting dust from a flue gas stream. - ANSWER -
Electrostatic Precipitator
Normally Open (NO) and Normally Closed (NC) indicate the state of a switch
when it is: - ANSWER -De-Energized
The measurement unit used to express the rate of flow, refers to the: - ANSWER -
Velocity
What is a device that changes a voltage signal to a current signal? - ANSWER -
E/I transducer
A number value on a pH scale indicates the: - ANSWER -Acidity or alkalinity of
a chemical
As the temperature rises in a closed vessel the pressure: - ANSWER -Increases
USING THE 4 TO 1 RULE THE DISTANCE OUT FROM A WALL THE
LADDER SHOULD BE IF THE WORKING LENGTH IS 16FT WOULD BE? -
ANSWER -4FT
