3/24/25, 9:00 PM Z-51 Written Test
Z-51 Written Test
FDNY Z51 WRITTEN TEST ACTUAL EXAM 2024 WITH QUESTIONS
AND CORRECT ANSWERS (100% CORRECT VERIFIED ANSWERS)
ACTUAL FDNY Z-51 WRITTEN EXAM (BRAND NEW!!)
When must the Fire C) The sprinkler system will be out of service on 1st and 2nd
Department be notified that a floors.
fire protection system is out
of
service?
A) The manual pull alarm
station in the lobby will be
out of service for 4 hours.
B) Four sprinkler heads on a
same floor of your building
will be out of service for 2
hours.
C) The sprinkler system
will be out of service on
1st and 2nd floors.
D) The fire alarm system is
out of service in the
refrigerating system room
for g hours.
Hot work authorizations are A) a Responsible Person designated by the building owner.
issued by
A) a Responsible Person
designated by the Building
Owner.
B) a Building Department
inspector.
C) a FDNY inspector.
D) the Building owner's
insurance company.
/ 1/46
,3/24/25, 9:00 PM Z-51 Written Test
Insecticidal fogging C) may be toxic.
operations are hazardous
because chemicals
A) are corrosive.
B) are water-reactive.
C) may be toxic.
D) are highly unstable.
What is a compressor safety head?
A) Rupture disc.
B) A pressure relief valve on the low side.
C) Cylinder head with a low
pressure relief on the high
side.
D) A spring on the valve plate.
The oil collected in an oil
separator is generally
A) caused by an oil overcharge.
B) returned to the compressor.
C) filtered and returned to the compressor.
D) drained and replaced by fresh oil.
Where is emergency power D) Data centers.
not required according to
code?
A) Fire pumps.
B) High rise elevators.
C) Egress illumination.
D) Data centers.
Modern compressors usually seal the
rotating shaft seal as it exits
the compressor housing a
spring-loaded seal made
of
/ 2/46
,3/24/25, 9:00 PM Z-51 Written Test
A) low-friction plastic.
B) rubber.
C) metal or carbon.
D) graphite-loaded fiber.
A technician shows up to D) A S-97/S-98 Certificate of Fitness holder who is
service the fire alarm panel employed by a FDNY certified company.
in your building. What COF
qualifications must he/she
have?
A) A Q-01/Q-99 Certificate of
Qualification holder who is
designated by the building
owner.
B) A certified Fire Safety
Director who is
designated by the
building owner.
C) A S-95 Certificate of
Fitness holder who is
employed by a FDNY
certified company.
D) A S-97/S-98 Certificate of
Fitness holder who is
employed by a FDNY
certified
company.
Which statement is correct
regarding a fusible plug on
a condenser?
A) The melting point is marked on it.
B) Are not allowed by code.
C) Release refrigerant by pressure.
D) Can be back-seated.
/ 3/46
, 3/24/25, 9:00 PM Z-51 Written Test
In an office building, the A) never allowed.
display of cut natural trees
(Christmas trees) is
A) never allowed.
B) allowed provided they
are removed once they
dry out.
C) always allowed.
D) allowed during the holiday
season.
Describe the equipment's B) Remove non-condensable from the condenser.
function in the picture.
A) Control flow of
refrigerant to the
compressor.
B) Remove non-
condensable from the
condenser.
C) Relieve excess
pressure from the
condenser.
D) Relieve excess
pressure from the
evaporator.
When the expansion valve is A) only superheated vapor.
operating properly, the end of
the evaporator will contain
A) only superheated vapor.
B) saturated liquid refrigerant
C) only vapor.
D) only liquid refrigerant.
/ 4/46
Z-51 Written Test
FDNY Z51 WRITTEN TEST ACTUAL EXAM 2024 WITH QUESTIONS
AND CORRECT ANSWERS (100% CORRECT VERIFIED ANSWERS)
ACTUAL FDNY Z-51 WRITTEN EXAM (BRAND NEW!!)
When must the Fire C) The sprinkler system will be out of service on 1st and 2nd
Department be notified that a floors.
fire protection system is out
of
service?
A) The manual pull alarm
station in the lobby will be
out of service for 4 hours.
B) Four sprinkler heads on a
same floor of your building
will be out of service for 2
hours.
C) The sprinkler system
will be out of service on
1st and 2nd floors.
D) The fire alarm system is
out of service in the
refrigerating system room
for g hours.
Hot work authorizations are A) a Responsible Person designated by the building owner.
issued by
A) a Responsible Person
designated by the Building
Owner.
B) a Building Department
inspector.
C) a FDNY inspector.
D) the Building owner's
insurance company.
/ 1/46
,3/24/25, 9:00 PM Z-51 Written Test
Insecticidal fogging C) may be toxic.
operations are hazardous
because chemicals
A) are corrosive.
B) are water-reactive.
C) may be toxic.
D) are highly unstable.
What is a compressor safety head?
A) Rupture disc.
B) A pressure relief valve on the low side.
C) Cylinder head with a low
pressure relief on the high
side.
D) A spring on the valve plate.
The oil collected in an oil
separator is generally
A) caused by an oil overcharge.
B) returned to the compressor.
C) filtered and returned to the compressor.
D) drained and replaced by fresh oil.
Where is emergency power D) Data centers.
not required according to
code?
A) Fire pumps.
B) High rise elevators.
C) Egress illumination.
D) Data centers.
Modern compressors usually seal the
rotating shaft seal as it exits
the compressor housing a
spring-loaded seal made
of
/ 2/46
,3/24/25, 9:00 PM Z-51 Written Test
A) low-friction plastic.
B) rubber.
C) metal or carbon.
D) graphite-loaded fiber.
A technician shows up to D) A S-97/S-98 Certificate of Fitness holder who is
service the fire alarm panel employed by a FDNY certified company.
in your building. What COF
qualifications must he/she
have?
A) A Q-01/Q-99 Certificate of
Qualification holder who is
designated by the building
owner.
B) A certified Fire Safety
Director who is
designated by the
building owner.
C) A S-95 Certificate of
Fitness holder who is
employed by a FDNY
certified company.
D) A S-97/S-98 Certificate of
Fitness holder who is
employed by a FDNY
certified
company.
Which statement is correct
regarding a fusible plug on
a condenser?
A) The melting point is marked on it.
B) Are not allowed by code.
C) Release refrigerant by pressure.
D) Can be back-seated.
/ 3/46
, 3/24/25, 9:00 PM Z-51 Written Test
In an office building, the A) never allowed.
display of cut natural trees
(Christmas trees) is
A) never allowed.
B) allowed provided they
are removed once they
dry out.
C) always allowed.
D) allowed during the holiday
season.
Describe the equipment's B) Remove non-condensable from the condenser.
function in the picture.
A) Control flow of
refrigerant to the
compressor.
B) Remove non-
condensable from the
condenser.
C) Relieve excess
pressure from the
condenser.
D) Relieve excess
pressure from the
evaporator.
When the expansion valve is A) only superheated vapor.
operating properly, the end of
the evaporator will contain
A) only superheated vapor.
B) saturated liquid refrigerant
C) only vapor.
D) only liquid refrigerant.
/ 4/46
