Page 1 of 230
DC 3RD CLASS TEST, 3RD CLASS
STATIONARY STEAM ENGINEER LICENSE,
AND DC 1ST CLASS BOILER 2026 EXAM PREP
COMPLETE (1263) CURRENT TESTING
QUESTIONS AND DETAILED CORRECT
ANSWERS|GUARANTEED PASS.
STEAM ENGINEER
Maximize your success with this DC 3rd Class Test, 3rd Class
Stationary Steam Engineer License, and DC 1st Class Boiler
Exam prep resource, designed to assess essential knowledge of
boiler operation and stationary engineering systems. It focuses
on steam plant operations, safety protocols, equipment
maintenance, and regulatory compliance for multiple licensing
levels. Suitable for stationary engineer certification candidates
and industrial maintenance professionals.
The feedwater control valve position is controlled by the
_______ of the fluid as caused by the temp changes caused
by water level changes in the thermostatic tube ✓ ✓ ......
ANSWER ....... PRESSURE
, Page 2 of 230
The 3 element feedwater regulator senses ________
_________ AND_________. ✓ ✓ ...... ANSWER ....... steam
flow - feedwater flow - and water level
The _______ ________uses boiler water to complete the
electrical circuit ✓ ✓ ...... ANSWER ....... submerged
electrode
The submerged electrode does not have a __________
_______. ✓ ✓ ...... ANSWER ....... mercury switch
2 types of electric boilers ✓ ✓ ...... ANSWER .......
RESISTANCE and ELECTRODE
Electric current flows through the water and converts
electrical energy to heat energy in the ________type boiler ✓
✓ ...... ANSWER ....... ELECTRODE
A high voltage steam electrode has voltage between _____
AND_________ ✓ ✓ ...... ANSWER ....... 2300 and 15000
Volts
, Page 3 of 230
A high voltage steam electrode boiler has ___ generating
compartments; one for each phase. ✓ ✓ ...... ANSWER
....... 3
The capacity of a safety valve on an electric boiler is __ lbs
per KW or ___ btus per hr per KW ✓ ✓ ...... ANSWER .......
3.5 LBS - 3500btus per KW
An HTHW system has better temp control becauase it has a
large _______ _______ ________. ✓ ✓ ...... ANSWER .......
heat storage capacity
Downtherm thermal liquid systems use ________
_____________ at tubes to prevent leaking ✓ ✓ ......
ANSWER ....... welded joints
__________ ________ boilers recover heat in the exaust from a
gas turbine to produce usefull steam ✓ ✓ ...... ANSWER
....... WASTE HEAT
, Page 4 of 230
When exaust gasses dont have enough energy to produce
the final steam pressure _______ ________ is used. ✓ ✓ ......
ANSWER ....... SUPPLEMENTAL FIRING
A recovery steam generator converts steam energy to
mechanical energy to produce electricity in a ________
________ plant. ✓ ✓ ...... ANSWER ....... COMBINED
CYCLE
___________ ___________Sell steam to local industrial plants
and surplus electric to local utilities ✓ ✓ ...... ANSWER
....... COGENERATION PLANTS
Superheated steam is injected into a gas turbine to increase
electrical output in the ______ _____________. ✓ ✓ ......
ANSWER ....... CHENG CYCLE
Waste products from sugar cane are used in a BAGASSE
plant. When dried it has a heating value of ________ to
_________ btus per lb ✓ ✓ ...... ANSWER ....... 8000 to
8700 btus per lb
DC 3RD CLASS TEST, 3RD CLASS
STATIONARY STEAM ENGINEER LICENSE,
AND DC 1ST CLASS BOILER 2026 EXAM PREP
COMPLETE (1263) CURRENT TESTING
QUESTIONS AND DETAILED CORRECT
ANSWERS|GUARANTEED PASS.
STEAM ENGINEER
Maximize your success with this DC 3rd Class Test, 3rd Class
Stationary Steam Engineer License, and DC 1st Class Boiler
Exam prep resource, designed to assess essential knowledge of
boiler operation and stationary engineering systems. It focuses
on steam plant operations, safety protocols, equipment
maintenance, and regulatory compliance for multiple licensing
levels. Suitable for stationary engineer certification candidates
and industrial maintenance professionals.
The feedwater control valve position is controlled by the
_______ of the fluid as caused by the temp changes caused
by water level changes in the thermostatic tube ✓ ✓ ......
ANSWER ....... PRESSURE
, Page 2 of 230
The 3 element feedwater regulator senses ________
_________ AND_________. ✓ ✓ ...... ANSWER ....... steam
flow - feedwater flow - and water level
The _______ ________uses boiler water to complete the
electrical circuit ✓ ✓ ...... ANSWER ....... submerged
electrode
The submerged electrode does not have a __________
_______. ✓ ✓ ...... ANSWER ....... mercury switch
2 types of electric boilers ✓ ✓ ...... ANSWER .......
RESISTANCE and ELECTRODE
Electric current flows through the water and converts
electrical energy to heat energy in the ________type boiler ✓
✓ ...... ANSWER ....... ELECTRODE
A high voltage steam electrode has voltage between _____
AND_________ ✓ ✓ ...... ANSWER ....... 2300 and 15000
Volts
, Page 3 of 230
A high voltage steam electrode boiler has ___ generating
compartments; one for each phase. ✓ ✓ ...... ANSWER
....... 3
The capacity of a safety valve on an electric boiler is __ lbs
per KW or ___ btus per hr per KW ✓ ✓ ...... ANSWER .......
3.5 LBS - 3500btus per KW
An HTHW system has better temp control becauase it has a
large _______ _______ ________. ✓ ✓ ...... ANSWER .......
heat storage capacity
Downtherm thermal liquid systems use ________
_____________ at tubes to prevent leaking ✓ ✓ ......
ANSWER ....... welded joints
__________ ________ boilers recover heat in the exaust from a
gas turbine to produce usefull steam ✓ ✓ ...... ANSWER
....... WASTE HEAT
, Page 4 of 230
When exaust gasses dont have enough energy to produce
the final steam pressure _______ ________ is used. ✓ ✓ ......
ANSWER ....... SUPPLEMENTAL FIRING
A recovery steam generator converts steam energy to
mechanical energy to produce electricity in a ________
________ plant. ✓ ✓ ...... ANSWER ....... COMBINED
CYCLE
___________ ___________Sell steam to local industrial plants
and surplus electric to local utilities ✓ ✓ ...... ANSWER
....... COGENERATION PLANTS
Superheated steam is injected into a gas turbine to increase
electrical output in the ______ _____________. ✓ ✓ ......
ANSWER ....... CHENG CYCLE
Waste products from sugar cane are used in a BAGASSE
plant. When dried it has a heating value of ________ to
_________ btus per lb ✓ ✓ ...... ANSWER ....... 8000 to
8700 btus per lb
