MD STATIONARY ENGINEER GRADE 1 FINAL
PAPER 2026 EXAM STUDY SHEET
◉ What Refrigerant Classification is Ammonia R-717? Answer: B2
◉ How is moisture taken out of refrigerant system? Answer: Filter
Drier ; high vaccum
◉ What is the max toxicity level of class B refrigerant? Answer:
400ppm
◉ On Gas fired Boilers what isthe proper Gas to Air mixture?
Answer: 30% to 70% and can be 100% in special arrangements
◉ What is the Equalizing system? Answer: Equalizing system is for
warming up steam lead
◉ Which is not an organic sludge conditioner? Answer: Amines
◉ Which byproduct has the highest heating valve? Answer: Butane
,◉ An increase of 10 to 20 degrees above design temp can reduce
creep life by how many years? Answer: 10 to 20 (pg578-579)
◉ What is ultrasound testing? Answer: A nondestructive test for
metal thickness in boilers. (pg 243; 610)
◉ What are the causes of gas turbine blade failure? Answer: Deposit
accumulation; erosion; corrosion
◉ What is the speed of steam through a pipe? Answer: 10 000 ft/sec
at pressures above 16 psi 5 000 ft/sec at pressures below 16 psi
◉ On an open air evaporator what is the most likely to occur?
Answer: Bacteria and algae build up
◉ What pressure controls are on a steam boiler? Answer: Operator
pressure cut out and upper limit control
◉ What are the temperature controls on a hot water boiler? Answer:
Operating limit control and upper limit control
◉ On a single boiler high pressure boiler what type of valves are
needed Answer: Single supply OS& Y
,◉ What is the last device to prevent boiler from overheating
Answer: Flame guard system
◉ Carbon dioxide is what type of refrigerant? Answer: B2
◉ Hot water boilers have how many manual resets on LWCO.
Answer: 1
◉ Steam boilers have how many manual resets on LWCO Answer: 2
◉ Class 3 is how flammable? Answer: Hazards
◉ Hardness formula Answer: (Calcium X 2.5)+ (Magnesium X 4.1)
◉ Lack of penetration in a weld joint is most accuratley detected by
the use of__________________ testing. Answer: Radiographic - X-ray
◉ The test most commonly used to determine the wall thickness of
pipe and flat plate is________. Answer: Ultrasonic
◉ Firetube boilers are likely to leak due to cracking; burning and
corrosion of the _________ _______. Answer: tube ends
, ◉ The ratio of a boiler's heat output to it's heat input
is_____________________. Answer: boiler efficinncy
◉ Welding flat strips of metal between the waterwall tubes is known
as ________ wall construction. Answer: membrane
◉ The general classification of superheaters includes _________ and
_________ types. Answer: Radient and Convection
◉ Pipes connecting the water column to the boiler must be a
minimum diameter of _____" Answer: 1"
◉ Cogeneration plants sell ____ to local industrial plants and______ to
the local utility. Answer: Steam ; Electricity
◉ Saftey Valve capacity must be sufficient to relieve all the steam
that the boiler can generate at the _____ _____ ______ without allowing
the pressure to rise more than _% above the MAWP. Answer: Max
firing rate ; 6%
◉ The______ _______ mechanism on the High Limit Control calls
attention if the _________ control has malfunctioned. Answer: Manual
reset ; Operating control
PAPER 2026 EXAM STUDY SHEET
◉ What Refrigerant Classification is Ammonia R-717? Answer: B2
◉ How is moisture taken out of refrigerant system? Answer: Filter
Drier ; high vaccum
◉ What is the max toxicity level of class B refrigerant? Answer:
400ppm
◉ On Gas fired Boilers what isthe proper Gas to Air mixture?
Answer: 30% to 70% and can be 100% in special arrangements
◉ What is the Equalizing system? Answer: Equalizing system is for
warming up steam lead
◉ Which is not an organic sludge conditioner? Answer: Amines
◉ Which byproduct has the highest heating valve? Answer: Butane
,◉ An increase of 10 to 20 degrees above design temp can reduce
creep life by how many years? Answer: 10 to 20 (pg578-579)
◉ What is ultrasound testing? Answer: A nondestructive test for
metal thickness in boilers. (pg 243; 610)
◉ What are the causes of gas turbine blade failure? Answer: Deposit
accumulation; erosion; corrosion
◉ What is the speed of steam through a pipe? Answer: 10 000 ft/sec
at pressures above 16 psi 5 000 ft/sec at pressures below 16 psi
◉ On an open air evaporator what is the most likely to occur?
Answer: Bacteria and algae build up
◉ What pressure controls are on a steam boiler? Answer: Operator
pressure cut out and upper limit control
◉ What are the temperature controls on a hot water boiler? Answer:
Operating limit control and upper limit control
◉ On a single boiler high pressure boiler what type of valves are
needed Answer: Single supply OS& Y
,◉ What is the last device to prevent boiler from overheating
Answer: Flame guard system
◉ Carbon dioxide is what type of refrigerant? Answer: B2
◉ Hot water boilers have how many manual resets on LWCO.
Answer: 1
◉ Steam boilers have how many manual resets on LWCO Answer: 2
◉ Class 3 is how flammable? Answer: Hazards
◉ Hardness formula Answer: (Calcium X 2.5)+ (Magnesium X 4.1)
◉ Lack of penetration in a weld joint is most accuratley detected by
the use of__________________ testing. Answer: Radiographic - X-ray
◉ The test most commonly used to determine the wall thickness of
pipe and flat plate is________. Answer: Ultrasonic
◉ Firetube boilers are likely to leak due to cracking; burning and
corrosion of the _________ _______. Answer: tube ends
, ◉ The ratio of a boiler's heat output to it's heat input
is_____________________. Answer: boiler efficinncy
◉ Welding flat strips of metal between the waterwall tubes is known
as ________ wall construction. Answer: membrane
◉ The general classification of superheaters includes _________ and
_________ types. Answer: Radient and Convection
◉ Pipes connecting the water column to the boiler must be a
minimum diameter of _____" Answer: 1"
◉ Cogeneration plants sell ____ to local industrial plants and______ to
the local utility. Answer: Steam ; Electricity
◉ Saftey Valve capacity must be sufficient to relieve all the steam
that the boiler can generate at the _____ _____ ______ without allowing
the pressure to rise more than _% above the MAWP. Answer: Max
firing rate ; 6%
◉ The______ _______ mechanism on the High Limit Control calls
attention if the _________ control has malfunctioned. Answer: Manual
reset ; Operating control
