NYC - Final RMO Exam Questions And Answers
The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the following, a more efficient centrifugal compressor operation results from
a. Raising the condenser liquid level to the maximum
b. lowering the chilled water...
NYC
-
Final
RMO
The
ef ficiency
of
the
refrigerant
cycle
is
af fected
by
the
operation
of
the
condenser .
Of
the
following,
a
more
ef ficient
centrifugal
compressor
operation
results
from
a.
Raising
the
condenser
liquid
level
to
the
maximum
b.
lowering
the
chilled
water
set
point.
c.
raising
the
condenser
head
pressure
d.
lowering
the
condenser
pressure
-
ANS
Lowering
the
condensing
pressure
The
heat
removed
from
the
refrigerant
in
a
condenser
is
a.
sensible
and
latent
heat
b.
latent
heat
only
c.
radiant
heat
only
d.
sensible
heat
only
-
ANS
sensible
and
latent
heat
The
refrigerant
unit
that
you
have
been
assigned
to
is
being
taken
out
of
service
for
major
repair .
Y ou
have
been
assigned
to
withdraw
refrigerant
from
storage
in
suitable
containers.
According
to
the
NYC
fire
code,
you
must
ensure
that
the
containers
a.
do
not
weigh
more
than
200lbs
when
filled
b.
Are
approved
by
the
US
Department
of
T ransportation
(DOT)
c.
are
approved
by
the
OSHA
association
d.
do
not
exceed
55
gallon
in
capacity
-
ANS
Are
approved
by
the
US
Department
of
T ransportation
(DOT)
Which
of
the
following
best
describes
how
the
cylinder
unloader
work?
a.
Keep
in
the
suction
valve
opened
while
the
compressor
is
in
the
return
stroke.
b.
controls
the
clearance
volume
in
the
compressor
with
a
solenoid
c.
controls
the
opening
of
the
passage
into
the
compressor
with
variable
vanes
d.
unloads
the
pistons
to
create
less
pressure
-
ANS
Keep
in
the
suction
valve
opened
while
the
compressor
is
in
the
return
stroke.
In
most
semi
hermetic
compressors,
the
suction
vapor
is
used
to
-
ANS
Cools
the
motor The
amount
of
refrigerant
that
flows
through
the
orifices
of
an
economizer
is
determined
by
the
-
ANS
Dif ference
between
the
high
side
and
low
side
pressure
The
installation
of
an
inline
refrigerant
cleaning
system
is
advisable
-
ANS
T o
remove
impurities
in
the
system
The
type
of
refrigerant
system
that
is
least
likely
to
leak
refrigerant
into
the
building
space
that
are
being
cooled
are
-
ANS
Indirect
systems
The
suction
pressure
of
a
reciprocating
compressor
is
65
PSIG.
The
discharge
pressure
of
this
compressor
is
120
PSIG.
The
atmospheric
is
14.7PSI.
the
compression
ratio
for
the
given
condition
is
closest
to:
-
ANS
1.69
(PSIG+14.7)
Then
divide
both
PSIG
to
get
ratio
A
superheated
vappr
is
a
-
ANS
dry
vapor
above
the
saturation
temperature
A
refrigerant
engineer
verifies
that
a
condenser
water
pump
is
cavitating.
Of
the
following,
the
most
likely
cause
for
this
condition
is:
-
ANS
A
faulty
cooling
tower
water
level
controller
A
centrifugal
water
pump
is
known
as
a
lift
pump
when
the
-
ANS
water
supply
to
the
pump
suction
inlet
is
below
the
pump
level.
A
TXV
is
used
to
maintain
constant
-
ANS
Evaporator
superheat
The
chilled
water
supply
to
the
building
is
55F .
If
the
chiller
is
being
used
for
human
comfort,
should
you
be
concerned
about
this,
and
why?
-
ANS
Y es,
this
temperature
is
too
high
for
human
comfort
purpose.
The
packing
gland
of
a
centrifugal
pump
serves
to:
-
ANS
The
drip
part
of
the
packing
gland,
gives
evidence
that
there
is
water
in
the
pump.
Capacity
control
of
a
reciprocating
hermetic
compressor
is
typically
achieved
through
-
ANS
Operation
of
the
hot
gas
bypass
valve.
The
most
important
reason
to
sub-cool
the
refrigerant
in
the
condenser
is
to
ensure
that:
-
ANS
A
pure
liquid
refrigerant
will
enter
the
metering
device.
A
refrigeration
engineer
is
logging
readings
from
a
reciprocating
system.
Compressor
discharge
temps
have
dropped
significantly
and
the
suction
line
pressure
is
high.
Which
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