CIRO Chapter 1 Practice Exams 2024-2025
Guide
1. What was the main disadvantage of hand expansion C. They did not automat-
valves in early refrigeration systems? ically adjust to changing
A. They were big and bulky and took up a lot of space loads so an operator had
B. They always required service because they had to frequently check and
many moving parts adjust them
C. They did not automatically adjust to changing loads
so an operator had to frequently check and adjust
them
D. The valve seat wore out very rapidly and would not
hold when the valve was closed all the way
2. What is the advantage of a thermostatic expansion A. They will automatical-
valve ly adjust themselves to
A. They will automatically adjust themselves to match match varying load condi-
varying load conditions tions
B. They create a fully wetted coil surface with coil ca-
pacity equal to a flooded system
C. They can be used on 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, spring,
static expansion valve? and the evaporator pres-
A. One - only the bulb pressure sure
B. Two - only the bulb and spring pressure
C. Three - the bulb, spring and the evaporator pressure
D. Four - the bulb, spring, evaporator and atmospheric
pressure.
4. Which of the following best describes the term "Flash C. The gas that is gener-
Gas" ated at the orifice of the
A. The vapor in the last 25% of travel in a DX coil expansion device
1/5
, CIRO Chapter 1 Practice Exams 2024-2025
Guide
B. The gas that is discharged out of the compressor
C. The gas that is generated at the orifice of the expan-
sion valve
D. The gas that is traveling down the suction line to-
ward the compressor
5. What is the average starting point for setting super- B. 10deg F
heat at the outlet of a DX coil
A. 5deg F
B. 10deg F
C. 25deg F
D. 1deg F
6. Level adjustment of an "LL" type float switch assembly D. Entering new level pa-
is accomplished by rameters in the float con-
A. Adjusting the activation screw on the switch mech- troller
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 controller
7. When servicing a DX air unit B. A separate isolation
A. It is acceptable to use the TXV as an isolation valve as valve must always be used
the warm temperature will result in a complete closing to isolate the coil
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 super-
heat adjustment is turned completely in to the "manu-
al off" position
2/5
Guide
1. What was the main disadvantage of hand expansion C. They did not automat-
valves in early refrigeration systems? ically adjust to changing
A. They were big and bulky and took up a lot of space loads so an operator had
B. They always required service because they had to frequently check and
many moving parts adjust them
C. They did not automatically adjust to changing loads
so an operator had to frequently check and adjust
them
D. The valve seat wore out very rapidly and would not
hold when the valve was closed all the way
2. What is the advantage of a thermostatic expansion A. They will automatical-
valve ly adjust themselves to
A. They will automatically adjust themselves to match match varying load condi-
varying load conditions tions
B. They create a fully wetted coil surface with coil ca-
pacity equal to a flooded system
C. They can be used on 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, spring,
static expansion valve? and the evaporator pres-
A. One - only the bulb pressure sure
B. Two - only the bulb and spring pressure
C. Three - the bulb, spring and the evaporator pressure
D. Four - the bulb, spring, evaporator and atmospheric
pressure.
4. Which of the following best describes the term "Flash C. The gas that is gener-
Gas" ated at the orifice of the
A. The vapor in the last 25% of travel in a DX coil expansion device
1/5
, CIRO Chapter 1 Practice Exams 2024-2025
Guide
B. The gas that is discharged out of the compressor
C. The gas that is generated at the orifice of the expan-
sion valve
D. The gas that is traveling down the suction line to-
ward the compressor
5. What is the average starting point for setting super- B. 10deg F
heat at the outlet of a DX coil
A. 5deg F
B. 10deg F
C. 25deg F
D. 1deg F
6. Level adjustment of an "LL" type float switch assembly D. Entering new level pa-
is accomplished by rameters in the float con-
A. Adjusting the activation screw on the switch mech- troller
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 controller
7. When servicing a DX air unit B. A separate isolation
A. It is acceptable to use the TXV as an isolation valve as valve must always be used
the warm temperature will result in a complete closing to isolate the coil
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 super-
heat adjustment is turned completely in to the "manu-
al off" position
2/5
