3/24/25, 9:22 PM FDNY written z51 questions
FDNY written z51 EXAM
FDNY Z51 WRITTEN FINAL EXAM 2024-2025 MOST RECENT
VERSIONS COMPREHENSIVE QUESTIONS WITH DETAILED
VERIFIED ANSWERS (100% CORRECT ANSWERS) GET IT RIGHT
|GRADED A+
Terms in this set (400)
A rooftop water cooling 323
tower is connected to a
water pump in the building
basement with a 12 inches
diameter pipe. with the
pump turn off, a pressure
gauge at the pumps inlet
show a pressure of 140
PSIG the height of the
water column, in feet,
would be closet to.
What device protects the governor assembly
steam turbine from
excessive speed?
/ 1/56
,3/24/25, 9:22 PM FDNY written z51 questions
A refrigeration Temperature and pressure controls
compressor has failed to
turn on. the refrigeration
engineer on duty verifies
that the electrical circuit to
the motor, including all
switches and circuit
breakers, is complete
according to
recommended service
practice, the next item to
be checked would likely
be the:
Refrigerants are Ammonia
characterized by their
physical properties
included flash point,
refrigeration effect, and
others. of the refrigerant
in commercial and
industrial the highest
latent hear and refrigerant
effect is:
On what characteristics is Flammability and toxicity
ASHRAE refrigerant safety
group classification
system:
Of the following, and Refrigerant recycling
example of an in-line
refrigerant cleaning
system that may be used
with a centrifugal
compressor containing
R123 refrigerant is:
/ 2/56
,3/24/25, 9:22 PM FDNY written z51 questions
Information about the Material Safety Data Sheet
physical and chemical
properties of a hazardous
material can be found in:
What is the function of the Establish oil pressure during turbine start up
turbine auxiliary oil pump?
The rupture disc for a low- Compressor suction
pressure centrifugal
refrigeration machine is
normally located on the:
What is the primary reason It allows for flexibility and accounts for vibrations
ribbed metal piping is
used for electrical wires
connected to the
refrigeration system
shown below?
A multi-cylinder The chill water temperature will increase
reciprocating compressor
uses cylinder unloaders to
regulate capacity, what
would not occur if some
of the unloaders fail to
operate when needed?
/ 3/56
, 3/24/25, 9:22 PM FDNY written z51 questions
As shown in the picture 440
below, the suction gauge
of a condenser water
pump reads 55 PSI. the
pipe supplying the pump
is 75 feet long and 12
inches in diameter.
approximately how many
gallons of water do you
expect to obtain if this
pipe is drained
completely?
A water chilling system A higher than normal high side pressure
uses refrigerant R123. a
leak in the evaporator
shell mat result in
Capacitors are used on Store electrical charges during starting and running
refrigeration motors. of the motor
the following, the function
of these devices is to?
Of the following, High volume low pressure machine
centrifugal refrigerant
machine is best
characterized by:
Which of the following A3
ASHRAE refrigerant safety
classification is the most
flammable?
Which of the following Standpipe hose outlet to put out fires in cae of
correctly describes the emergency
object in the picture
below?
/ 4/56
FDNY written z51 EXAM
FDNY Z51 WRITTEN FINAL EXAM 2024-2025 MOST RECENT
VERSIONS COMPREHENSIVE QUESTIONS WITH DETAILED
VERIFIED ANSWERS (100% CORRECT ANSWERS) GET IT RIGHT
|GRADED A+
Terms in this set (400)
A rooftop water cooling 323
tower is connected to a
water pump in the building
basement with a 12 inches
diameter pipe. with the
pump turn off, a pressure
gauge at the pumps inlet
show a pressure of 140
PSIG the height of the
water column, in feet,
would be closet to.
What device protects the governor assembly
steam turbine from
excessive speed?
/ 1/56
,3/24/25, 9:22 PM FDNY written z51 questions
A refrigeration Temperature and pressure controls
compressor has failed to
turn on. the refrigeration
engineer on duty verifies
that the electrical circuit to
the motor, including all
switches and circuit
breakers, is complete
according to
recommended service
practice, the next item to
be checked would likely
be the:
Refrigerants are Ammonia
characterized by their
physical properties
included flash point,
refrigeration effect, and
others. of the refrigerant
in commercial and
industrial the highest
latent hear and refrigerant
effect is:
On what characteristics is Flammability and toxicity
ASHRAE refrigerant safety
group classification
system:
Of the following, and Refrigerant recycling
example of an in-line
refrigerant cleaning
system that may be used
with a centrifugal
compressor containing
R123 refrigerant is:
/ 2/56
,3/24/25, 9:22 PM FDNY written z51 questions
Information about the Material Safety Data Sheet
physical and chemical
properties of a hazardous
material can be found in:
What is the function of the Establish oil pressure during turbine start up
turbine auxiliary oil pump?
The rupture disc for a low- Compressor suction
pressure centrifugal
refrigeration machine is
normally located on the:
What is the primary reason It allows for flexibility and accounts for vibrations
ribbed metal piping is
used for electrical wires
connected to the
refrigeration system
shown below?
A multi-cylinder The chill water temperature will increase
reciprocating compressor
uses cylinder unloaders to
regulate capacity, what
would not occur if some
of the unloaders fail to
operate when needed?
/ 3/56
, 3/24/25, 9:22 PM FDNY written z51 questions
As shown in the picture 440
below, the suction gauge
of a condenser water
pump reads 55 PSI. the
pipe supplying the pump
is 75 feet long and 12
inches in diameter.
approximately how many
gallons of water do you
expect to obtain if this
pipe is drained
completely?
A water chilling system A higher than normal high side pressure
uses refrigerant R123. a
leak in the evaporator
shell mat result in
Capacitors are used on Store electrical charges during starting and running
refrigeration motors. of the motor
the following, the function
of these devices is to?
Of the following, High volume low pressure machine
centrifugal refrigerant
machine is best
characterized by:
Which of the following A3
ASHRAE refrigerant safety
classification is the most
flammable?
Which of the following Standpipe hose outlet to put out fires in cae of
correctly describes the emergency
object in the picture
below?
/ 4/56
