Pipefitter Star Exam Questions And Correct Detailed
Answers Latest Update (Brand New!!!).
What causes 90% of all construction injuries and deaths and are used to help OSHA
inspectors improve their effectiveness? - ANSWER: Focus Hazards
What is the minimum safe working distance for overhead power lines? - ANSWER: 10
feet
What is the standard procedure used to safely de-energize equipment on circuits before they
are worked on? - ANSWER: Lockout/Tagout
Which of the following is not true about Material Safety Data Sheets? - ANSWER: They
can be written in any language
What are the four focus inspections OSHA compliance officers look for? - ANSWER: Fall
Hazards, Electrical Hazards, Caught in, Struck by
The sizes of pipe are identified by the measurement called the: - ANSWER: Nominal pipe
size NPS
Steel pipe is supplied with the following end finish (es): - ANSWER: PESC, T & C TBE
Plain End Square cut, Threaded and Coupled, Threaded Both ends
What is a typical type of welded pipe joints? - ANSWER: Butt-welded, Socket-welded,
Slip-on Flanged (All of the above)
List the four principle functions of valves. - ANSWER: Start/Stop, Regulate/Throttle,
Relief, Reduce
Regulating or throttling flow is done with a: - ANSWER: Globe and Gate valve
Name the two basic types of check valves. - ANSWER: Lift and Swing
The most common hanger used in piping systems is the: - ANSWER: Clevis
Never expose any part of a compressed gas cylinder to temperatures above: - ANSWER:
125°F
1
,The four types of copper tube joints are soldered, brazed, flared and _____? - ANSWER:
compression
What is the maximum recommended service temperature when a brazed joint is used? -
ANSWER: 350 degrees F
Poor alignment of tube joints will cause: - ANSWER: spacing difference between tubes
and fittings
After fittings and tubes are cleaned and fluxed they should be assembled and soldered: -
ANSWER: as soon as possible
Name three basic hitches which can be used for lifting with a sling - ANSWER: Straight,
Choker, Basket
Which hitch can support the most weight? - ANSWER: Basket hitch
Why should the angle between the leg of a sling and the load never be less than 30 degrees? -
ANSWER: More stress loads are applied on slings.
What is the weakest part of a chain hoist? - ANSWER: Lower hook
An oxyacetylene flame has a peak temperature of approximately: - ANSWER: 6300°F
What is the purpose of slightly opening/cracking a gas cylinder valve before installing a gas
regulator? - ANSWER: clear debris
Why is it important to ensure that no part of the oxygen handling equipment comes in contact
with oil? - ANSWER: causes an explosion
What is the constant used to find the travel with a 45 degree offset? - ANSWER: 1.414
What is the constant used to find the offset or advance with a 45 offset? - ANSWER: .707
Change the following to architectural measurements 3.96': - ANSWER: 3' - 11 ½"
MSDS is part of the "right to know" law. - ANSWER: t
2
,IDLH is an individual's daily level of hazards - ANSWER: f
Inhalation, ingestion, absorption and injection are four routes of entry. - ANSWER: t
When voltage is applied to a conductor, free electrons: - ANSWER: Are impelled along
the conductor
The magnetic field around a current-carrying wire: - ANSWER: Exists at all points along
its length
A lamp has a source of 110 volts and current of 0.9 amps, what is the resistance of the lamp?
- ANSWER: 122.2 ohms
The device used in circuits to prevent damage from overloads is called a: - ANSWER:
Fuse
A thermocouple: - ANSWER: Generates a small amount of voltage when heated
Sensible heat is defined as: - ANSWER: quantity of heat involved to change a substance
that can be measured with a thermometer
Latent heat is defined as: - ANSWER: amount of heat required to bring about a change in
state in a substance
Specific heat is defined as: - ANSWER: amount of heat in BTU's required to change the
temperature of 1 pound of a substance 1 Degree F.
The pressure at a certain depth below the surface of a liquid: - ANSWER: is the same in
all directions
Pressure is: - ANSWER: force per unit of area
Work is defined as: - ANSWER: force times distance
Name the two main classifications of pump types. - ANSWER: Positive Displacement
pumps and Non-Positive Displacement pumps
The violent flashing and collapsing of vapor bubbles in a centrifugal pump is called? -
ANSWER: Cavitation
3
, 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 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
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.
4
Answers Latest Update (Brand New!!!).
What causes 90% of all construction injuries and deaths and are used to help OSHA
inspectors improve their effectiveness? - ANSWER: Focus Hazards
What is the minimum safe working distance for overhead power lines? - ANSWER: 10
feet
What is the standard procedure used to safely de-energize equipment on circuits before they
are worked on? - ANSWER: Lockout/Tagout
Which of the following is not true about Material Safety Data Sheets? - ANSWER: They
can be written in any language
What are the four focus inspections OSHA compliance officers look for? - ANSWER: Fall
Hazards, Electrical Hazards, Caught in, Struck by
The sizes of pipe are identified by the measurement called the: - ANSWER: Nominal pipe
size NPS
Steel pipe is supplied with the following end finish (es): - ANSWER: PESC, T & C TBE
Plain End Square cut, Threaded and Coupled, Threaded Both ends
What is a typical type of welded pipe joints? - ANSWER: Butt-welded, Socket-welded,
Slip-on Flanged (All of the above)
List the four principle functions of valves. - ANSWER: Start/Stop, Regulate/Throttle,
Relief, Reduce
Regulating or throttling flow is done with a: - ANSWER: Globe and Gate valve
Name the two basic types of check valves. - ANSWER: Lift and Swing
The most common hanger used in piping systems is the: - ANSWER: Clevis
Never expose any part of a compressed gas cylinder to temperatures above: - ANSWER:
125°F
1
,The four types of copper tube joints are soldered, brazed, flared and _____? - ANSWER:
compression
What is the maximum recommended service temperature when a brazed joint is used? -
ANSWER: 350 degrees F
Poor alignment of tube joints will cause: - ANSWER: spacing difference between tubes
and fittings
After fittings and tubes are cleaned and fluxed they should be assembled and soldered: -
ANSWER: as soon as possible
Name three basic hitches which can be used for lifting with a sling - ANSWER: Straight,
Choker, Basket
Which hitch can support the most weight? - ANSWER: Basket hitch
Why should the angle between the leg of a sling and the load never be less than 30 degrees? -
ANSWER: More stress loads are applied on slings.
What is the weakest part of a chain hoist? - ANSWER: Lower hook
An oxyacetylene flame has a peak temperature of approximately: - ANSWER: 6300°F
What is the purpose of slightly opening/cracking a gas cylinder valve before installing a gas
regulator? - ANSWER: clear debris
Why is it important to ensure that no part of the oxygen handling equipment comes in contact
with oil? - ANSWER: causes an explosion
What is the constant used to find the travel with a 45 degree offset? - ANSWER: 1.414
What is the constant used to find the offset or advance with a 45 offset? - ANSWER: .707
Change the following to architectural measurements 3.96': - ANSWER: 3' - 11 ½"
MSDS is part of the "right to know" law. - ANSWER: t
2
,IDLH is an individual's daily level of hazards - ANSWER: f
Inhalation, ingestion, absorption and injection are four routes of entry. - ANSWER: t
When voltage is applied to a conductor, free electrons: - ANSWER: Are impelled along
the conductor
The magnetic field around a current-carrying wire: - ANSWER: Exists at all points along
its length
A lamp has a source of 110 volts and current of 0.9 amps, what is the resistance of the lamp?
- ANSWER: 122.2 ohms
The device used in circuits to prevent damage from overloads is called a: - ANSWER:
Fuse
A thermocouple: - ANSWER: Generates a small amount of voltage when heated
Sensible heat is defined as: - ANSWER: quantity of heat involved to change a substance
that can be measured with a thermometer
Latent heat is defined as: - ANSWER: amount of heat required to bring about a change in
state in a substance
Specific heat is defined as: - ANSWER: amount of heat in BTU's required to change the
temperature of 1 pound of a substance 1 Degree F.
The pressure at a certain depth below the surface of a liquid: - ANSWER: is the same in
all directions
Pressure is: - ANSWER: force per unit of area
Work is defined as: - ANSWER: force times distance
Name the two main classifications of pump types. - ANSWER: Positive Displacement
pumps and Non-Positive Displacement pumps
The violent flashing and collapsing of vapor bubbles in a centrifugal pump is called? -
ANSWER: Cavitation
3
, 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 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
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.
4
