Maryland Stationary Engineer Exam (2026-2027)
UPDATE EXAM 190 QUESTIONS WITH
MULTIPLE CHOICES VERIFIED & REVISED
ANSWERS (NEW)!!
____ lbs of air are needed for every 1 lb of fuel for proper combustion - CORRECT ANSWER:
15
______ has a low heating value and is not often used as a boiler fuel. - CORRECT ANSWER:
Lignite
______ is hard coal with a high fixed carbon content. - CORRECT ANSWER: Anthracite
_______ air controls the rate of combustion. - CORRECT ANSWER: Primary
_______ draft is a combination of forced and induced draft - CORRECT ANSWER:
Combination
_________ air controls the efficiency of combustion. - CORRECT ANSWER: Secondary
_________ is soft coal with high volatility. It is prone to spontaneous combustion. - CORRECT
ANSWER: Bituminous
- Combination draft is blowing and sucking together - CORRECT ANSWER:
- determine the relieving capacity of a safety valve by looking at the manufacturer's data sheet -
CORRECT ANSWER:
,- Fuel oil pumps are usually positive displacement and have relief valves - CORRECT
ANSWER:
- safety valve resets at a pressure slightly lower than the popping pressure- the difference in
pressure is called blowdown or blowback - CORRECT ANSWER:
- The bottom portion of the water column holds sediment= sediment chamber - CORRECT
ANSWER:
-#6 fuel oil must be heated - CORRECT ANSWER:
-3 parts of fire triangle= heat, fuel, oxygen - CORRECT ANSWER:
-4 things needed to achieve proper combustion when burning fuel oil, mixture, atomization, time,
and temperature. Remembered by the acronym MATT - CORRECT ANSWER:
-Accumulation test- done on high fire, close main steam stop valve, done to test the popping
pressure of the safety valve. Popping pressure of valve must not exceed the MAWP of the boiler
by more than 6%. Cannot be done on a boiler with a superheater. - CORRECT ANSWER:
-Accuracy on steam pressure gauge should be 2% - CORRECT ANSWER:
-Air cock= another name for boiler vent - CORRECT ANSWER:
-Any accessories on the water column must be approved by ASME and have at least 1 inch
piping - CORRECT ANSWER:
-Best way to control TDS is continuous blowdown. - CORRECT ANSWER:
, -blowdown gauge glass/water column once a shift - CORRECT ANSWER:
-Blowdown line sizes= 1 inch to 2 ½ inches - CORRECT ANSWER:
-Boiler efficiency= how much heat is absorbed into the water compared to how much heat is
contained in the fuel - CORRECT ANSWER:
-Boiler startup procedure: Pre purge the boiler for 30 seconds, light the pilot, prove the pilot for
10 seconds, light the main burner, prove the main burner, secure pilot after main flame has been
established. Reach cutout point (Main)-secure fuel, and post purge. The controls have 4 seconds
to secure the fuel if we lose the flame. - CORRECT ANSWER:
-Boiler vent, mounted to the highest part of the steam side of the boiler. Open the vent while
boiler is cooling to break the vacuum caused by collapsing steam. Before any/bo enters the boiler
or before filling boiler, make sure the vent is open. - CORRECT ANSWER:
-Bottom blowdown = at least once a day. Open the valve closest to the boiler first and close it
last. - CORRECT ANSWER:
-Calibrate steam pressure gauge annually- 2% accuracy- 1 ½ to 2 times MAWP - CORRECT
ANSWER:
-Cast iron sectional boiler "Pork Chop Boiler" - CORRECT ANSWER:
-Chattering= rapid opening and closing of a safety valve - CORRECT ANSWER:
-Close the vent after the boiler starts making steam, allows for air and non-condensables to
escape. - CORRECT ANSWER:
UPDATE EXAM 190 QUESTIONS WITH
MULTIPLE CHOICES VERIFIED & REVISED
ANSWERS (NEW)!!
____ lbs of air are needed for every 1 lb of fuel for proper combustion - CORRECT ANSWER:
15
______ has a low heating value and is not often used as a boiler fuel. - CORRECT ANSWER:
Lignite
______ is hard coal with a high fixed carbon content. - CORRECT ANSWER: Anthracite
_______ air controls the rate of combustion. - CORRECT ANSWER: Primary
_______ draft is a combination of forced and induced draft - CORRECT ANSWER:
Combination
_________ air controls the efficiency of combustion. - CORRECT ANSWER: Secondary
_________ is soft coal with high volatility. It is prone to spontaneous combustion. - CORRECT
ANSWER: Bituminous
- Combination draft is blowing and sucking together - CORRECT ANSWER:
- determine the relieving capacity of a safety valve by looking at the manufacturer's data sheet -
CORRECT ANSWER:
,- Fuel oil pumps are usually positive displacement and have relief valves - CORRECT
ANSWER:
- safety valve resets at a pressure slightly lower than the popping pressure- the difference in
pressure is called blowdown or blowback - CORRECT ANSWER:
- The bottom portion of the water column holds sediment= sediment chamber - CORRECT
ANSWER:
-#6 fuel oil must be heated - CORRECT ANSWER:
-3 parts of fire triangle= heat, fuel, oxygen - CORRECT ANSWER:
-4 things needed to achieve proper combustion when burning fuel oil, mixture, atomization, time,
and temperature. Remembered by the acronym MATT - CORRECT ANSWER:
-Accumulation test- done on high fire, close main steam stop valve, done to test the popping
pressure of the safety valve. Popping pressure of valve must not exceed the MAWP of the boiler
by more than 6%. Cannot be done on a boiler with a superheater. - CORRECT ANSWER:
-Accuracy on steam pressure gauge should be 2% - CORRECT ANSWER:
-Air cock= another name for boiler vent - CORRECT ANSWER:
-Any accessories on the water column must be approved by ASME and have at least 1 inch
piping - CORRECT ANSWER:
-Best way to control TDS is continuous blowdown. - CORRECT ANSWER:
, -blowdown gauge glass/water column once a shift - CORRECT ANSWER:
-Blowdown line sizes= 1 inch to 2 ½ inches - CORRECT ANSWER:
-Boiler efficiency= how much heat is absorbed into the water compared to how much heat is
contained in the fuel - CORRECT ANSWER:
-Boiler startup procedure: Pre purge the boiler for 30 seconds, light the pilot, prove the pilot for
10 seconds, light the main burner, prove the main burner, secure pilot after main flame has been
established. Reach cutout point (Main)-secure fuel, and post purge. The controls have 4 seconds
to secure the fuel if we lose the flame. - CORRECT ANSWER:
-Boiler vent, mounted to the highest part of the steam side of the boiler. Open the vent while
boiler is cooling to break the vacuum caused by collapsing steam. Before any/bo enters the boiler
or before filling boiler, make sure the vent is open. - CORRECT ANSWER:
-Bottom blowdown = at least once a day. Open the valve closest to the boiler first and close it
last. - CORRECT ANSWER:
-Calibrate steam pressure gauge annually- 2% accuracy- 1 ½ to 2 times MAWP - CORRECT
ANSWER:
-Cast iron sectional boiler "Pork Chop Boiler" - CORRECT ANSWER:
-Chattering= rapid opening and closing of a safety valve - CORRECT ANSWER:
-Close the vent after the boiler starts making steam, allows for air and non-condensables to
escape. - CORRECT ANSWER:
