FDNY z51 test (2025) comprehensive
questions and verified answers (
detailed & elaborated) ACTUAL
EXAM 2025 TEST!!
Save
Terms in this set (201)
What is a completely dry vapor
superheated
vapor?
In electrical Green or Bare
circuits the
conductor is
always what
color?
Unloaders are To increase capacity
used for what?
,Oil foaming in a A sudden drop in crankcase pressure
crankcase is
caused by what?
How would you Spraying liquid refrigerant from a
test for acid in the condenser or receiver on to bond
refrigerant? paper
What is the To allow operation at different
function of a capacities
cylinder bypass?
The chilled water Yes. this temperature is too high for
supply to the human comfort purpose
building is 55F. If
the chiller is
being used for
human comfort,
should you be
concerned about
this, and why?
The packing The drip part of the packing gland
gland of a gives evidence that there is water in
centrifugal pump the pump
serves to:
,Capacity control Operation of the hot gas bypass valve
of a reciprocating
hermetic
compressor is
typically achieved
through
The most A pure liquid refrigerant will enter the
important reason metering device
to sub-cool the
refrigerant in the
condenser is to
ensure that:
, A refrigeration An expansion valve that is open to
engineer is wide
logging reading
from a
reciprocating
system.
compressor
discharge
temperature have
dropped
significantly and
the suction line
pressure is high.
which of the
following that
may be causing
this set of
condition.
A low side float The level of the refrigerant in the
valve is used to evaporator
maintain:
questions and verified answers (
detailed & elaborated) ACTUAL
EXAM 2025 TEST!!
Save
Terms in this set (201)
What is a completely dry vapor
superheated
vapor?
In electrical Green or Bare
circuits the
conductor is
always what
color?
Unloaders are To increase capacity
used for what?
,Oil foaming in a A sudden drop in crankcase pressure
crankcase is
caused by what?
How would you Spraying liquid refrigerant from a
test for acid in the condenser or receiver on to bond
refrigerant? paper
What is the To allow operation at different
function of a capacities
cylinder bypass?
The chilled water Yes. this temperature is too high for
supply to the human comfort purpose
building is 55F. If
the chiller is
being used for
human comfort,
should you be
concerned about
this, and why?
The packing The drip part of the packing gland
gland of a gives evidence that there is water in
centrifugal pump the pump
serves to:
,Capacity control Operation of the hot gas bypass valve
of a reciprocating
hermetic
compressor is
typically achieved
through
The most A pure liquid refrigerant will enter the
important reason metering device
to sub-cool the
refrigerant in the
condenser is to
ensure that:
, A refrigeration An expansion valve that is open to
engineer is wide
logging reading
from a
reciprocating
system.
compressor
discharge
temperature have
dropped
significantly and
the suction line
pressure is high.
which of the
following that
may be causing
this set of
condition.
A low side float The level of the refrigerant in the
valve is used to evaporator
maintain:
