CIRO EXAM |ACTUAL QUESTIONS AND VERIFIED
ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
What was the main disadvantage of hand expansion valves in early refrigeration systems
A. They were big and bulky
B. They always required service because they had many moving parts
C. They did not automatically adjust to changing loads so an operator had to frequently
check and adjust them
CORRECT ANSWER
C. They did not automatically adjust to changing loads so an operator had to frequently
check and adjust them
Question 2
What is the advantage of a thermostatic expansion valve
A. They will automatically adjust themselves to match varying load conditions
B. They create fully wetted coil surface with coil capacity 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
CORRECT ANSWER
A. They will automatically adjust themselves to match varying load conditions
Question 3
How many forces are involved in operating a thermostatic expansion valve?
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,A. One - only bulb pressure
B. Two - only the bulb and spring pressure
C. Three - The bulb, spring, and evaporator pressure
D. Four - The bulb, spring, evaporator, and atmospheric pressure
CORRECT ANSWER
C. Three - The bulb, spring, and evaporator pressure
Question 4
Which of the following best describes the term 'flash gas'?
A. The vapor in the last 25% of travel in a DX coil
B. The gas that is discharged out of the compressor
C. The gas that is generated at the orifice of the expansion device
D. The gas that is traveling down the suction line toward the compressor
CORRECT ANSWER
C. The gas that is generated at the orifice of the expansion device
Question 5
What is the average starting point for setting superheat at the outlet of a DX coil?
A. 5F
B. 10F
C. 25F
D. 1F
CORRECT ANSWER
B. 10F
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@THE STUDY VAULT
,Question 6
Level adjustment of an "LL" type float switch assembly is accomplished by
A. Adjusting the activation screw on the switch mechanism
B. Re-piping or re-attaching the float at a different level
C. Re-calibrating the switch height on the float assembly
D. Entering new level parameters in the float controller
CORRECT ANSWER
B. Re-piping or re-attaching the float at a different level
Question 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 superheat adjustment is turned completely
in to the "manual off" position
D. The TXV can be used to isolate the coil if the superheat adjustment is turned completely
out to the "manual off" position
CORRECT ANSWER
B. A separate isolation valve must always be used to isolate the coil
Question 8
Which of the following is a typical function of a low side vessel?
A. Oil cooling
B. Phase separation
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, C. Thermosiphon refrigerant storage
D. Subcooling liquid for low side use
CORRECT ANSWER
B. Phase separation
Question 9
If a power element of a TXV lost its charge
A. The evaporator would starve
B. The evaporator would hunt
C. There would be low superheat at the coil outlet
D. The evaporator would flood
CORRECT ANSWER
A. The evaporator would starve
Question 10
Hand expansion valves are
A. Seldom used in newer systems
B. Only used to feed gravity flooded evaporators
C. Not used in series with another feed control device
D. Commonly used in series with another feed control device
CORRECT ANSWER
D. Commonly used in series with another feed control device
Question 11
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@THE STUDY VAULT
ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
What was the main disadvantage of hand expansion valves in early refrigeration systems
A. They were big and bulky
B. They always required service because they had many moving parts
C. They did not automatically adjust to changing loads so an operator had to frequently
check and adjust them
CORRECT ANSWER
C. They did not automatically adjust to changing loads so an operator had to frequently
check and adjust them
Question 2
What is the advantage of a thermostatic expansion valve
A. They will automatically adjust themselves to match varying load conditions
B. They create fully wetted coil surface with coil capacity 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
CORRECT ANSWER
A. They will automatically adjust themselves to match varying load conditions
Question 3
How many forces are involved in operating a thermostatic expansion valve?
1
@THE STUDY VAULT
,A. One - only bulb pressure
B. Two - only the bulb and spring pressure
C. Three - The bulb, spring, and evaporator pressure
D. Four - The bulb, spring, evaporator, and atmospheric pressure
CORRECT ANSWER
C. Three - The bulb, spring, and evaporator pressure
Question 4
Which of the following best describes the term 'flash gas'?
A. The vapor in the last 25% of travel in a DX coil
B. The gas that is discharged out of the compressor
C. The gas that is generated at the orifice of the expansion device
D. The gas that is traveling down the suction line toward the compressor
CORRECT ANSWER
C. The gas that is generated at the orifice of the expansion device
Question 5
What is the average starting point for setting superheat at the outlet of a DX coil?
A. 5F
B. 10F
C. 25F
D. 1F
CORRECT ANSWER
B. 10F
2
@THE STUDY VAULT
,Question 6
Level adjustment of an "LL" type float switch assembly is accomplished by
A. Adjusting the activation screw on the switch mechanism
B. Re-piping or re-attaching the float at a different level
C. Re-calibrating the switch height on the float assembly
D. Entering new level parameters in the float controller
CORRECT ANSWER
B. Re-piping or re-attaching the float at a different level
Question 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 superheat adjustment is turned completely
in to the "manual off" position
D. The TXV can be used to isolate the coil if the superheat adjustment is turned completely
out to the "manual off" position
CORRECT ANSWER
B. A separate isolation valve must always be used to isolate the coil
Question 8
Which of the following is a typical function of a low side vessel?
A. Oil cooling
B. Phase separation
3
@THE STUDY VAULT
, C. Thermosiphon refrigerant storage
D. Subcooling liquid for low side use
CORRECT ANSWER
B. Phase separation
Question 9
If a power element of a TXV lost its charge
A. The evaporator would starve
B. The evaporator would hunt
C. There would be low superheat at the coil outlet
D. The evaporator would flood
CORRECT ANSWER
A. The evaporator would starve
Question 10
Hand expansion valves are
A. Seldom used in newer systems
B. Only used to feed gravity flooded evaporators
C. Not used in series with another feed control device
D. Commonly used in series with another feed control device
CORRECT ANSWER
D. Commonly used in series with another feed control device
Question 11
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@THE STUDY VAULT
