CIRO OP 2 Question and answers rated A+
2025/2026
1. What was the main disadvantage of hand C. They did not
expansion valves in early refrigeration automat- ically adjust
systems to changing loads so
A. They were big and bulky an operator had to
B. They always required service because frequently check and
they had many moving parts adjust them
C.They did not automatically adjust to changing
loads so an operator had to frequently check
and adjust them
2. What is the advantage of a thermostatic A. They will
expansion valve automatical- ly adjust
themselves to
A. They will automatically adjust themselves to match match varying
load condi-
varying load conditions tions
B. They create fully wetted coil surface with coil
capac- ity equal to a gravity flooded system
C. They can be used on gravity, flooded,
recirculated over-feed and DX systems
D. One size fits all evaporators
3. How many forces are involved in operating a thermo- C. Three - The
bulb,
static expansion valve? 4. Which of
A. One - only bulb pressure the
B. Two - only the bulb and spring pressure following
C. Three - The bulb, spring, and evaporator best
pressure describes
D.Four - The bulb, spring, evaporator, and the term
atmospher- ic pressure 'flash gas'
A. The
1/
54
, vapor in the last 25% of travel in a DX coil spring, and
B. The gas that is discharged out of the evaporator
compressor pressure
C.The gas that is generated at the orifice of the
expan-
C. The gas that is
gener- ated at the
orifice of the
expansion device
2/
54
, CIRO OP 2
Study online at https://quizlet.com/_e9bqtn
sion device
D. The gas that is traveling down the suction
line to- ward the compressor
5. What is the average starting point for setting B. 10F
super- heat at the outlet of a DX coil?
A. 5F
B. 10F
C. 25F
D. 1F
6. Level adjustment of an "LL" type float switch assembly B. Re-piping or
re-attach-
is accomplished by su-
A. Adjusting the activation screw on the switch
mech- anism
B. Re-piping or re-attaching the float at a
different level
C. Re-calibrating the switch height on the float
assem- bly
D. Entering new level parameters in the
float con- troller
7. When servicing a DX air unit
A. It is acceptable to use the TXV as an
isolation valve as the warm temperature will
result in a complete closing of the valve
B. A separate isolation valve must always be
used to isolate the coil
C. The TXV can be used to isolate the coil if
the su- perheat adjustment is turned
completely in to the "manual off" position
D. The TXV can be used to isolate the coil if the
3/
54
,ing the float at a ditterent level
B. A separate isolation valve must always be used to isolate the coil
4/
54
2025/2026
1. What was the main disadvantage of hand C. They did not
expansion valves in early refrigeration automat- ically adjust
systems to changing loads so
A. They were big and bulky an operator had to
B. They always required service because frequently check and
they had many moving parts adjust them
C.They did not automatically adjust to changing
loads so an operator had to frequently check
and adjust them
2. What is the advantage of a thermostatic A. They will
expansion valve automatical- ly adjust
themselves to
A. They will automatically adjust themselves to match match varying
load condi-
varying load conditions tions
B. They create fully wetted coil surface with coil
capac- ity equal to a gravity flooded system
C. They can be used on gravity, flooded,
recirculated over-feed and DX systems
D. One size fits all evaporators
3. How many forces are involved in operating a thermo- C. Three - The
bulb,
static expansion valve? 4. Which of
A. One - only bulb pressure the
B. Two - only the bulb and spring pressure following
C. Three - The bulb, spring, and evaporator best
pressure describes
D.Four - The bulb, spring, evaporator, and the term
atmospher- ic pressure 'flash gas'
A. The
1/
54
, vapor in the last 25% of travel in a DX coil spring, and
B. The gas that is discharged out of the evaporator
compressor pressure
C.The gas that is generated at the orifice of the
expan-
C. The gas that is
gener- ated at the
orifice of the
expansion device
2/
54
, CIRO OP 2
Study online at https://quizlet.com/_e9bqtn
sion device
D. The gas that is traveling down the suction
line to- ward the compressor
5. What is the average starting point for setting B. 10F
super- heat at the outlet of a DX coil?
A. 5F
B. 10F
C. 25F
D. 1F
6. Level adjustment of an "LL" type float switch assembly B. Re-piping or
re-attach-
is accomplished by su-
A. Adjusting the activation screw on the switch
mech- anism
B. Re-piping or re-attaching the float at a
different level
C. Re-calibrating the switch height on the float
assem- bly
D. Entering new level parameters in the
float con- troller
7. When servicing a DX air unit
A. It is acceptable to use the TXV as an
isolation valve as the warm temperature will
result in a complete closing of the valve
B. A separate isolation valve must always be
used to isolate the coil
C. The TXV can be used to isolate the coil if
the su- perheat adjustment is turned
completely in to the "manual off" position
D. The TXV can be used to isolate the coil if the
3/
54
,ing the float at a ditterent level
B. A separate isolation valve must always be used to isolate the coil
4/
54
