stationary engineer test QUESTIONS
WITH DETAILED VERIFIED ANSWERS
(100% CORRECT ANSWERS) /
ALREADY GRADED A+
When designing a boiler, special consideration must be given to heat transmission ✔✔Radiation,
conduction, and convection
Which type of heat transfer takes place by actual physical contact, from molecule to molecule,
without displacing the molecules? ✔✔Conduction
Which type of boiler is the most economical to build? ✔✔Firetube
A boiler is an industrial boiler when ✔✔The steam generated is used for a process
Which is true about an industrial boiler as compared to a utility boiler? ✔✔Idustrial boilers operate
at lower pressures and temperatures
Utility boilers are used primarily to produce ✔✔High pressure steam to drive turbines that make
electricity
Which of the following is NOT a type of fire tube boiler? ✔✔Stirling
Which of the following is an example of a cogeneration system? ✔✔Exhaust gases from a
combustion turbine driven generator are used to make steam in a boiler for a secondary purpose
If the tubes in a boiler are expanded during installation, which of the following will
be true? ✔✔The ID is increased
When a new tube is installed in a firetube boiler, which of the following happens to
the tube? ✔✔The tube is lengthened
,What is the MINIMUM size of an elliptical manhole on a boiler? ✔✔11" x 15"
What is the MINIMUM water temperature to be used for a hydrostatic test? ✔✔70 degrees F
How many sq ft of heating surface are required to produce 1 horsepower in a HRT
firetube boiler? ✔✔12 sq ft
How many sq ft of heating surface are required to produce 1 horsepower in a
vertical firetube boiler? ✔✔14 sq ft
How many sq ft of heating surface are required to produce 1 horsepower in a
watertube boiler? ✔✔10 sq ft
If a high pressure boiler is at its highest operating pressure below the MAWP,
where will the pointer on the pressure gauge be? ✔✔at 12ʻ o clock
A gauge that reads higher than the actual boiler pressure is called a ✔✔Fast gauge
Which is true about a boiler pressure mercury switch? ✔✔Mercury switch must be installed with
pigtail siphon vertically
On a low pressure boiler, cut out equals ✔✔cut in plus differential
What is the MAXIMUM blowback on a safety relief valve that is set for 100 psig ✔✔4 psig
If a high pressure boiler operates at 100 psig, what should be the blowback of the
safety valve? ✔✔not more than 4% and not less then 2psi in any case
What is the MINIMUM blowback on a safety valve that pops at 250 psi. ✔✔5 psi
, A data plate on a safety valve on a low pressure boiler is marked "6900 Ib".
This refers to: ✔✔lb/hr capacity of the safety valve
When an accumulation test is performed, the boiler is fired at: ✔✔maximum firing rate with main
steam stop valve closed
You have a safety valve set on a 50 psi boiler system. What is the maximum
pressure that may be developed during safety valve blowdown? ✔✔53 psi
Oils and solids accumulating on the water surface in the boiler can lead to what
condition? ✔✔Foaming
If the water in a boiler is foaming, the water level indication in the gauge glass will
be ✔✔erratic
If you have a priming condition, the sight glass will read ✔✔high
A boiler has carried a large slug of water over into the steam. This condition is
called ✔✔priming
How do steam separators work? ✔✔they cause a sudden change in direction that throws water out
On a pressure gauge, what is the minimum size piping that can be used? ✔✔1/4" if copper or brass
pipe 1/2" if steel
Which statement is true about steel pipe when used on a boiler? ✔✔May not be less than 1/2"
When may copper tubing NOT be used for steam service? ✔✔when the temp exceeds 406
degrees/250psi
Cast iron or ductile iron pipe is used for ✔✔underground water supply and drainage
WITH DETAILED VERIFIED ANSWERS
(100% CORRECT ANSWERS) /
ALREADY GRADED A+
When designing a boiler, special consideration must be given to heat transmission ✔✔Radiation,
conduction, and convection
Which type of heat transfer takes place by actual physical contact, from molecule to molecule,
without displacing the molecules? ✔✔Conduction
Which type of boiler is the most economical to build? ✔✔Firetube
A boiler is an industrial boiler when ✔✔The steam generated is used for a process
Which is true about an industrial boiler as compared to a utility boiler? ✔✔Idustrial boilers operate
at lower pressures and temperatures
Utility boilers are used primarily to produce ✔✔High pressure steam to drive turbines that make
electricity
Which of the following is NOT a type of fire tube boiler? ✔✔Stirling
Which of the following is an example of a cogeneration system? ✔✔Exhaust gases from a
combustion turbine driven generator are used to make steam in a boiler for a secondary purpose
If the tubes in a boiler are expanded during installation, which of the following will
be true? ✔✔The ID is increased
When a new tube is installed in a firetube boiler, which of the following happens to
the tube? ✔✔The tube is lengthened
,What is the MINIMUM size of an elliptical manhole on a boiler? ✔✔11" x 15"
What is the MINIMUM water temperature to be used for a hydrostatic test? ✔✔70 degrees F
How many sq ft of heating surface are required to produce 1 horsepower in a HRT
firetube boiler? ✔✔12 sq ft
How many sq ft of heating surface are required to produce 1 horsepower in a
vertical firetube boiler? ✔✔14 sq ft
How many sq ft of heating surface are required to produce 1 horsepower in a
watertube boiler? ✔✔10 sq ft
If a high pressure boiler is at its highest operating pressure below the MAWP,
where will the pointer on the pressure gauge be? ✔✔at 12ʻ o clock
A gauge that reads higher than the actual boiler pressure is called a ✔✔Fast gauge
Which is true about a boiler pressure mercury switch? ✔✔Mercury switch must be installed with
pigtail siphon vertically
On a low pressure boiler, cut out equals ✔✔cut in plus differential
What is the MAXIMUM blowback on a safety relief valve that is set for 100 psig ✔✔4 psig
If a high pressure boiler operates at 100 psig, what should be the blowback of the
safety valve? ✔✔not more than 4% and not less then 2psi in any case
What is the MINIMUM blowback on a safety valve that pops at 250 psi. ✔✔5 psi
, A data plate on a safety valve on a low pressure boiler is marked "6900 Ib".
This refers to: ✔✔lb/hr capacity of the safety valve
When an accumulation test is performed, the boiler is fired at: ✔✔maximum firing rate with main
steam stop valve closed
You have a safety valve set on a 50 psi boiler system. What is the maximum
pressure that may be developed during safety valve blowdown? ✔✔53 psi
Oils and solids accumulating on the water surface in the boiler can lead to what
condition? ✔✔Foaming
If the water in a boiler is foaming, the water level indication in the gauge glass will
be ✔✔erratic
If you have a priming condition, the sight glass will read ✔✔high
A boiler has carried a large slug of water over into the steam. This condition is
called ✔✔priming
How do steam separators work? ✔✔they cause a sudden change in direction that throws water out
On a pressure gauge, what is the minimum size piping that can be used? ✔✔1/4" if copper or brass
pipe 1/2" if steel
Which statement is true about steel pipe when used on a boiler? ✔✔May not be less than 1/2"
When may copper tubing NOT be used for steam service? ✔✔when the temp exceeds 406
degrees/250psi
Cast iron or ductile iron pipe is used for ✔✔underground water supply and drainage
