Pipefitter Star Exam Study Guide
Questions And Answers Verified 100%
Correct
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
PIPE IS MADE IN WHICH OF THE FOLLOWING SIZES: - ANSWER -1/8"
TO 48"
PIPE SIZES ARE IDENTIFIED BY A MEASUREMENT CALLED THE -
ANSWER -NOMINAL PIPE SIZE
UNIFORM LENGTHS OF STEEL PIPE ARE WHAT LENGTH (±1") -
ANSWER -21'
COPPER TUBE IS DESIGNATED AS TYPE(S) - ANSWER -ALL OF THE
ABOVE (K,M,L)
CAST IRON PIPE HAS GOOD RESISTANCE TO - ANSWER -CORROSION,
ABRASION,
DEFORMATION
(ALL OF THE ABOVE)
THE NAME OF ALL SEGMENTS OF DIES USED FOR CUTTING THREADS
ARE CALLED - ANSWER -CHASERS
, WHAT FORMULA MUST BE USED TO CALCULATE THE STEP AHEAD IN
A PARALLEL OFFSET - ANSWER -.414 x EQUAL SPREAD
THE DEVICE WHICH FORMS A WATER SEAL THAT PREVENTS RAW
STEAM FROM ENTERING AND DAMAGING PRESSURE GAUGES IS A(N):
- ANSWER -PIGTAIL
THE BOILER RETURN LINE IS CONNECTED TO THE STEAM MAIN BY
A(N): - ANSWER -EQUALIZING LINE
THE STEAM FLOW INTO RADIATORS IN A ONE PIPE GRAVITY RETURN
STEAM HEATING SYSTEM CAN BE CONTROLLED BY: - ANSWER -
INSTALLING AN AIR VENT WITH A DIFFERENT VENTING CAPACITY
THE LENGTH OF PIPE (DRIP CONNECTION) THAT IS NEEDED TO
OVERCOME THE PRESSURE DROP IN A ONE PIPE GRAVITY RETURN
STEAM HEATING SYSTEM AND RETURN CONDENSATE TO THE
BOILER IS - ANSWER -28 INCHES
A THERMOSTATIC STEAM TRAP THAT FAILS IN THE CLOSED
POSITION WOULD CAUSE A HEATING UNIT TO BECOME - ANSWER -
WATERLOGGED
IF THE FLOAT IN A F & T TRAP FAILED AND FILLED WITH WATER THE
TRAP WOULD - ANSWER -NO CONDENSATE WOULD BE DISCHARGED
IN A TWO-PIPE GRAVITY RETURN STEAM SYSTEM. THE DEVICE THAT
PREVENTS RAW STEAM FROM ENTERING THE SYSTEM IS A - ANSWER
-STEAM TRAP
IN ORDER TO RETURN CONDENSATE TO A BOILER THE HEIGHT OF
THE WATER COLUMN NEEDED TO OVERCOME THE PRESSURE DROP
IN A TWO PIPE GRAVITY RETURN SYSTEM IS - ANSWER -28 INCHES
FOR EACH POUND OF PRESSURE THE BOILER IS PRODUCING
Questions And Answers Verified 100%
Correct
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
PIPE IS MADE IN WHICH OF THE FOLLOWING SIZES: - ANSWER -1/8"
TO 48"
PIPE SIZES ARE IDENTIFIED BY A MEASUREMENT CALLED THE -
ANSWER -NOMINAL PIPE SIZE
UNIFORM LENGTHS OF STEEL PIPE ARE WHAT LENGTH (±1") -
ANSWER -21'
COPPER TUBE IS DESIGNATED AS TYPE(S) - ANSWER -ALL OF THE
ABOVE (K,M,L)
CAST IRON PIPE HAS GOOD RESISTANCE TO - ANSWER -CORROSION,
ABRASION,
DEFORMATION
(ALL OF THE ABOVE)
THE NAME OF ALL SEGMENTS OF DIES USED FOR CUTTING THREADS
ARE CALLED - ANSWER -CHASERS
, WHAT FORMULA MUST BE USED TO CALCULATE THE STEP AHEAD IN
A PARALLEL OFFSET - ANSWER -.414 x EQUAL SPREAD
THE DEVICE WHICH FORMS A WATER SEAL THAT PREVENTS RAW
STEAM FROM ENTERING AND DAMAGING PRESSURE GAUGES IS A(N):
- ANSWER -PIGTAIL
THE BOILER RETURN LINE IS CONNECTED TO THE STEAM MAIN BY
A(N): - ANSWER -EQUALIZING LINE
THE STEAM FLOW INTO RADIATORS IN A ONE PIPE GRAVITY RETURN
STEAM HEATING SYSTEM CAN BE CONTROLLED BY: - ANSWER -
INSTALLING AN AIR VENT WITH A DIFFERENT VENTING CAPACITY
THE LENGTH OF PIPE (DRIP CONNECTION) THAT IS NEEDED TO
OVERCOME THE PRESSURE DROP IN A ONE PIPE GRAVITY RETURN
STEAM HEATING SYSTEM AND RETURN CONDENSATE TO THE
BOILER IS - ANSWER -28 INCHES
A THERMOSTATIC STEAM TRAP THAT FAILS IN THE CLOSED
POSITION WOULD CAUSE A HEATING UNIT TO BECOME - ANSWER -
WATERLOGGED
IF THE FLOAT IN A F & T TRAP FAILED AND FILLED WITH WATER THE
TRAP WOULD - ANSWER -NO CONDENSATE WOULD BE DISCHARGED
IN A TWO-PIPE GRAVITY RETURN STEAM SYSTEM. THE DEVICE THAT
PREVENTS RAW STEAM FROM ENTERING THE SYSTEM IS A - ANSWER
-STEAM TRAP
IN ORDER TO RETURN CONDENSATE TO A BOILER THE HEIGHT OF
THE WATER COLUMN NEEDED TO OVERCOME THE PRESSURE DROP
IN A TWO PIPE GRAVITY RETURN SYSTEM IS - ANSWER -28 INCHES
FOR EACH POUND OF PRESSURE THE BOILER IS PRODUCING
