NYC CUSTODIAN ENGINEER EXAM AND PRACTICE EXAM NEWEST 2026/
2027 TEST BANK| NYC CUSTODIAN ENGINEER EXAM PREP WITH
COMPLETE 200 REAL EXAM QUESTIONS AND CORRECT VERIFIED
ANSWERS/ ALREADY GRADED A+ (MOST RECENT!!)
Question 1
What is the primary responsibility of a NYC Custodian Engineer?
A) Teaching classes
B) Managing the physical plant, maintenance, and operations of a school building
C) Supervising teachers
D) Developing curriculum
Answer
Answer: B
Rationale
A Custodian Engineer is responsible for the overall operation, maintenance, and repair of the school
building and its systems, including heating, ventilation, plumbing, electrical, and grounds. They
supervise custodial staff and ensure a safe, clean, and functional environment for students and staff.
Question 2
What is the primary fuel source for most boilers in NYC public schools?
A) Coal
B) Natural gas
C) Fuel oil
D) Wood
Answer
Answer: B
Rationale
Most NYC public school boilers use natural gas as their primary fuel source, though many are dual-
fuel and can switch to fuel oil (#2 or #4) during periods of high demand or supply interruptions. Natural
gas is cleaner and more efficient than coal or oil.
,Question 3
What is the purpose of a boiler's aquastat?
A) To measure water pressure
B) To control water temperature
C) To measure steam pressure
D) To control fuel flow
Answer
Answer: B
Rationale
An aquastat is a temperature control device used on hot water boilers. It senses the water temperature
and turns the burner on or off to maintain the desired setpoint. It is not used on steam boilers (which
use a pressurtrol).
Question 4
What is the purpose of a steam boiler's pressurtrol?
A) To control water temperature
B) To control steam pressure
C) To control fuel flow
D) To control water level
Answer
Answer: B
Rationale
A pressurtrol (pressure control) is used on steam boilers to maintain the desired steam pressure. It
senses the pressure and turns the burner on or off to maintain the setpoint. It is not used on hot water
boilers.
Question 5
What is the function of a low-water cutoff on a boiler?
2
,A) To add water to the boiler
B) To shut off the burner if the water level drops too low
C) To increase steam pressure
D) To measure water temperature
Answer
Answer: B
Rationale
A low-water cutoff is a safety device that shuts off the burner if the water level in the boiler drops below
a safe minimum. This prevents the boiler from overheating and potentially exploding. It must be tested
regularly.
Question 6
What is the purpose of a boiler's safety valve?
A) To release excess pressure
B) To add water to the boiler
C) To control fuel flow
D) To measure water level
Answer
Answer: A
Rationale
A safety valve is a critical safety device that automatically releases steam or water if the pressure in
the boiler exceeds a predetermined limit. This prevents a catastrophic failure. Safety valves must be
tested and maintained regularly.
Question 7
What is the purpose of a boiler's sight glass?
A) To measure pressure
B) To visually check the water level in the boiler
C) To measure temperature
D) To check fuel level
3
, Answer
Answer: B
Rationale
A sight glass (water gauge glass) is a transparent tube on the side of a steam boiler that allows the
operator to visually verify the water level. Maintaining the correct water level is critical for safe boiler
operation.
Question 8
What is the purpose of a boiler's blowdown?
A) To add chemicals to the boiler
B) To remove sediment and impurities from the boiler water
C) To increase steam pressure
D) To measure water level
Answer
Answer: B
Rationale
Blowdown is the process of draining water from the boiler to remove accumulated sediment, sludge,
and dissolved solids. This prevents scale buildup, corrosion, and foaming. Blowdown should be
performed regularly according to the boiler's needs.
Question 9
What is the purpose of a steam trap?
A) To trap steam in the boiler
B) To remove condensate and air from steam lines while preventing steam loss
C) To increase steam pressure
D) To measure steam temperature
Answer
Answer: B
4
2027 TEST BANK| NYC CUSTODIAN ENGINEER EXAM PREP WITH
COMPLETE 200 REAL EXAM QUESTIONS AND CORRECT VERIFIED
ANSWERS/ ALREADY GRADED A+ (MOST RECENT!!)
Question 1
What is the primary responsibility of a NYC Custodian Engineer?
A) Teaching classes
B) Managing the physical plant, maintenance, and operations of a school building
C) Supervising teachers
D) Developing curriculum
Answer
Answer: B
Rationale
A Custodian Engineer is responsible for the overall operation, maintenance, and repair of the school
building and its systems, including heating, ventilation, plumbing, electrical, and grounds. They
supervise custodial staff and ensure a safe, clean, and functional environment for students and staff.
Question 2
What is the primary fuel source for most boilers in NYC public schools?
A) Coal
B) Natural gas
C) Fuel oil
D) Wood
Answer
Answer: B
Rationale
Most NYC public school boilers use natural gas as their primary fuel source, though many are dual-
fuel and can switch to fuel oil (#2 or #4) during periods of high demand or supply interruptions. Natural
gas is cleaner and more efficient than coal or oil.
,Question 3
What is the purpose of a boiler's aquastat?
A) To measure water pressure
B) To control water temperature
C) To measure steam pressure
D) To control fuel flow
Answer
Answer: B
Rationale
An aquastat is a temperature control device used on hot water boilers. It senses the water temperature
and turns the burner on or off to maintain the desired setpoint. It is not used on steam boilers (which
use a pressurtrol).
Question 4
What is the purpose of a steam boiler's pressurtrol?
A) To control water temperature
B) To control steam pressure
C) To control fuel flow
D) To control water level
Answer
Answer: B
Rationale
A pressurtrol (pressure control) is used on steam boilers to maintain the desired steam pressure. It
senses the pressure and turns the burner on or off to maintain the setpoint. It is not used on hot water
boilers.
Question 5
What is the function of a low-water cutoff on a boiler?
2
,A) To add water to the boiler
B) To shut off the burner if the water level drops too low
C) To increase steam pressure
D) To measure water temperature
Answer
Answer: B
Rationale
A low-water cutoff is a safety device that shuts off the burner if the water level in the boiler drops below
a safe minimum. This prevents the boiler from overheating and potentially exploding. It must be tested
regularly.
Question 6
What is the purpose of a boiler's safety valve?
A) To release excess pressure
B) To add water to the boiler
C) To control fuel flow
D) To measure water level
Answer
Answer: A
Rationale
A safety valve is a critical safety device that automatically releases steam or water if the pressure in
the boiler exceeds a predetermined limit. This prevents a catastrophic failure. Safety valves must be
tested and maintained regularly.
Question 7
What is the purpose of a boiler's sight glass?
A) To measure pressure
B) To visually check the water level in the boiler
C) To measure temperature
D) To check fuel level
3
, Answer
Answer: B
Rationale
A sight glass (water gauge glass) is a transparent tube on the side of a steam boiler that allows the
operator to visually verify the water level. Maintaining the correct water level is critical for safe boiler
operation.
Question 8
What is the purpose of a boiler's blowdown?
A) To add chemicals to the boiler
B) To remove sediment and impurities from the boiler water
C) To increase steam pressure
D) To measure water level
Answer
Answer: B
Rationale
Blowdown is the process of draining water from the boiler to remove accumulated sediment, sludge,
and dissolved solids. This prevents scale buildup, corrosion, and foaming. Blowdown should be
performed regularly according to the boiler's needs.
Question 9
What is the purpose of a steam trap?
A) To trap steam in the boiler
B) To remove condensate and air from steam lines while preventing steam loss
C) To increase steam pressure
D) To measure steam temperature
Answer
Answer: B
4
