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CSN AC 110 Esco Exam Practice Questions with 100% correct answers
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CSN AC 110 Esco Exam Practice Questions with 100% correct answers
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CSNAC
110
Esco
Exam
Practice
1.
Heat
which
causes
a
change
in
temperature
of
a
substance
is
called;
A.
latent
heat
B.
sensible
heat
C.
superheat
D.
radiant
heat
-
CORRECT
ANSWER-B.
sensible
heat
10.
The
state
of
the
refrigerant
in
the
suction
line
should
be;
A.
high
pressure
/
high
temperature
liquid
B
high
pressure
/
low
temperature
vapor
C.
low
pressure
/
low
temperature
liquid
D.
low
pressure
/
low
temperature
vapor
-
CORRECT
ANSWER-D.
low
pressure
/
low
temperature
vapor
100
A
dirty
evaporator
in
an
air
conditioning
system
will
cause
the
symptoms
A
high
suction
pressure
and
low
discharge
pressure
B
high
suction
pressure
and
high
discharge
pressure
C
low
suction
pressure
and
low
discharge
pressure
D
low
suction
pressure
and
high
discharge
pressure
-
CORRECT
ANSWER-C
low
suction
pressure
and
low
discharge
pressure
11.
The
state
of
the
refrigerant
entering
the
condenser
is;
A.
high
temperature
/
highly
superheated
liquid
B.
high
pressure
/
highly
superheated
vapor
C.
high
pressure
/
high
temperature
liquid
D.
low
pressure
/
low
temperature
vapor
-
CORRECT
ANSWER-B.
high
pressure
/
highly
superheated
vapor
12.
the
evaporator;
A.
transfers
heat
from
the
refrigerated
space
to
the
refrigerant
B.
transfers
heat
from
the
refrigerant
to
the
refrigerated
space
C.
transfers
heat
from
the
refrigerant
to
the
ambient
air
D.
transfers
heat
from
the
ambient
air
to
the
refrigerated
space
-
CORRECT
ANSWER-A.
transfers
heat
from
the
refrigerated
space
to
the
refrigerant
13.
Which
of
the
following
is
not
a
thermodynamic
property
of
refrigerants?
A.
critical
point
B.
saturation
point
C.
enthalpy D.
flammability
-
CORRECT
ANSWER-D.
flammability
14.
The
sequential
order
of
steps
in
the
vapor
-
compression
process
are;
A.
expansion,
condensation,
compression,
vaporization
B.
vaporization,
expansion,
condensation,
compression
C.
compression,
condensation,
expansion,
vaporization
D.
expression,
compression,
vaporization,
condensation
-
CORRECT
ANSWER-C.
compression,
condensation,
expansion,
vaporization
15.
If
a
30
pound
cylinder
of
reclaimed
R-410A
refrigerant
has
been
stored
over
night
at
70°F,
the
pressure
of
the
cylinder
shoudl
be
approximately:
A.
201
psig
B.
168
psig
C.
143
psig
D.
118
psig
-
CORRECT
ANSWER-A.
201
psig
16.
Fan
airflow
pressures
are
usually
measured
in;
A.
inches
of
mercury
vacuum
or
micorns
B.
microns
or
psig
C.
psig
or
inches
of
mercury
vacuum
D.
inches
of
water
column
(WC)
-
CORRECT
ANSWER-D.
inches
of
water
column
(WC)
17.
Zero
psia
(pounds
per
square
inch
absolute)
is;
A.
the
same
as
atmospheric
pressure
B.
approximately
14.7
psig
at
sea
level
C.
a
pressure
which
cannot
be
further
reduced
D.
equal
to
500
microns
-
CORRECT
ANSWER-B.
approximately
14.7
psig
at
sea
level
18.
zero
psig
(Pounds
per
squeare
indch
gauge
is;
A.
25,400
microns
B.
approximately
29.9
psia
at
sea-level
C.
a
pressure
which
cannot
be
further
reduced
D.
the
same
as
atmospheric
pressure
-
CORRECT
ANSWER-D.
the
same
as
atmospheric
pressure
19.
The
temperature
at
which
moisture
will
start
to
condense
from
the
air
is
called;
A.
dry
bulb
temperature B.
wet
buldb
dry
depression
C.
dew
point
temperature
D.
condensate
point
-
CORRECT
ANSWER-C.
dew
point
temperature
2.
Heat
added
to
a
substance
without
a
raise
in
temperature;
(example:
liquid
refrigerant
to
gas)
this
process
is
called?
A.
latent
heat
of
vaporization
B.
latent
heat
of
fusion.
C.
superheat
of
vaporization
D.
superheat
of
fusion
-
CORRECT
ANSWER-A.
latent
heat
of
vaporization
20.
A
compound
pressure
gauge
measures;
A.
pressure
and
vacuum
B.
pressure
and
temperature
C.
pressure
and
humidity
D.
wet
and
dry
bulb
temperatures
-
CORRECT
ANSWER-A.
pressure
and
vacuum
21.
A
mechanical
shaft
seal
is
necessary
on
a;
A.
semi-hermetic
compressor
B.
hermetic
reciprocating
compressor
C.
hermetic
rotary
compressor
D.
open
drive
compressor
-
CORRECT
ANSWER-C.
hermetic
rotary
compressor
22.
Liquid
slugging
is;
A.
a
pounding
noise
caused
by
liquid
refrigerant
in
the
suction
line
at
the
point
of
restriction
B.
noise
caused
by
excessive
liquid
refrigerant
in
the
condenser
C.
liquid
refrigerant
in
the
compressor
clearance
space
D.
excessive
liquid
refrigerant
in
the
receiver
-
CORRECT
ANSWER-C.
liquid
refrigerant
in
the
compressor
clearance
space
23.
The
clearance
of
space
in
a
reciprocating
compressor;
A
has
no
effect
on
compressor
capacity
B.
has
an
effect
on
compressor
capacity
C.
varies
depending
on
compressor
speed
D.
is
the
same
on
all
compressors
-
CORRECT
ANSWER-B.
has
an
effect
on
compressor
capacity
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