CIRO Test Questions
Study online at https://quizlet.com/_e5y60b
1. What is the lowest level in PPM at which ammonia is
generally detectable
A. 4 PPM
B. 5 PPM
C. 2 PPM
D. 8 PPM
2. Which gas is suitable for leak checking a modified pipe
section of an ammonia system
A. Sulfur dioxide
B. R-22
C. Dry nitrogen
D. R-414b
3. Which of these is true for a shell and tube condenser
A. Water evaporates in the tubes
B. Refrigerant flows through the tubes
C. Water flows through the shell
D. Refrigerant flows around the tubes
4. Which of these are factors in determining wet bulb
temperature
A. Moisture content and temperature of ambient air
B. Ambient air temperature and discharge tempera-
ture
C. Seasonal humidity
D. Discharge temperature and suction pressure
5. In a facility served only by flooded units, under what
conditions will the indicated liquid level run higher in
the high pressure receiver when all evaporators are
operating normally and not in defrost
1/9
, CIRO Test Questions
Study online at https://quizlet.com/_e5y60b
A. When the refrigerant hangs up in the condenser
B. When the plant is running at maximum load condi-
tions
C. When the plant is running at minimum load condi-
tions
D. The level does not shift in the high pressure receiver
6. Which of these require a dual relief valve assembly on
pressure vessels
A. A volume of one cubic foot or more
B. It is recommended but never required
C. A volume of 10 cubic feet or more
D. A volume of 100 cubic feet or more
7. Which of these are used as measurements for deter-
mining presence of non-condensables?
A. Compressor inlet pressure and temperature
B. Compressor discharge pressure and temperature
C. Condenser water temperature and inlet header
pressure
D. Condenser refrigerant outlet temperature and pres-
sure
8. How is capacity control achieved on a single speed
screw compressor
A. By moving the slide valve or slide piston
B. By throttling the bypass valve
C. By moving the guide vanes
D. Screw compressors do not have capacity control
9. A 100 ton evaporator is operating at -40deg F with
the condenser operating at 95deg F. Considering en-
ergy consumption only, which of these arrangements
2/9
Study online at https://quizlet.com/_e5y60b
1. What is the lowest level in PPM at which ammonia is
generally detectable
A. 4 PPM
B. 5 PPM
C. 2 PPM
D. 8 PPM
2. Which gas is suitable for leak checking a modified pipe
section of an ammonia system
A. Sulfur dioxide
B. R-22
C. Dry nitrogen
D. R-414b
3. Which of these is true for a shell and tube condenser
A. Water evaporates in the tubes
B. Refrigerant flows through the tubes
C. Water flows through the shell
D. Refrigerant flows around the tubes
4. Which of these are factors in determining wet bulb
temperature
A. Moisture content and temperature of ambient air
B. Ambient air temperature and discharge tempera-
ture
C. Seasonal humidity
D. Discharge temperature and suction pressure
5. In a facility served only by flooded units, under what
conditions will the indicated liquid level run higher in
the high pressure receiver when all evaporators are
operating normally and not in defrost
1/9
, CIRO Test Questions
Study online at https://quizlet.com/_e5y60b
A. When the refrigerant hangs up in the condenser
B. When the plant is running at maximum load condi-
tions
C. When the plant is running at minimum load condi-
tions
D. The level does not shift in the high pressure receiver
6. Which of these require a dual relief valve assembly on
pressure vessels
A. A volume of one cubic foot or more
B. It is recommended but never required
C. A volume of 10 cubic feet or more
D. A volume of 100 cubic feet or more
7. Which of these are used as measurements for deter-
mining presence of non-condensables?
A. Compressor inlet pressure and temperature
B. Compressor discharge pressure and temperature
C. Condenser water temperature and inlet header
pressure
D. Condenser refrigerant outlet temperature and pres-
sure
8. How is capacity control achieved on a single speed
screw compressor
A. By moving the slide valve or slide piston
B. By throttling the bypass valve
C. By moving the guide vanes
D. Screw compressors do not have capacity control
9. A 100 ton evaporator is operating at -40deg F with
the condenser operating at 95deg F. Considering en-
ergy consumption only, which of these arrangements
2/9
