CIRO Test Questions with complete
solutions graded A+
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 - correct answer ✔✔
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 - correct answer ✔✔
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 - correct answer ✔✔
Which of these are factors in determining wet bulb temperature
A. Moisture content and temperature of ambient air
B. Ambient air temperature and discharge temperature
C. Seasonal humidity
D. Discharge temperature and suction pressure - correct answer ✔✔
, 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
A. When the refrigerant hangs up in the condenser
B. When the plant is running at maximum load conditions
C. When the plant is running at minimum load conditions
D. The level does not shift in the high pressure receiver - correct answer ✔✔
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 - correct answer ✔✔
Which of these are used as measurements for determining 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 pressure - correct answer ✔✔
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 - correct answer ✔✔
A 100 ton evaporator is operating at -40deg F with the condenser operating at 95deg F. Considering
energy consumption only, which of these arrangements would have the lowest energy use when
operating?
A. Single stage centrifugal
B. Single stage piston machines
solutions graded A+
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 - correct answer ✔✔
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 - correct answer ✔✔
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 - correct answer ✔✔
Which of these are factors in determining wet bulb temperature
A. Moisture content and temperature of ambient air
B. Ambient air temperature and discharge temperature
C. Seasonal humidity
D. Discharge temperature and suction pressure - correct answer ✔✔
, 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
A. When the refrigerant hangs up in the condenser
B. When the plant is running at maximum load conditions
C. When the plant is running at minimum load conditions
D. The level does not shift in the high pressure receiver - correct answer ✔✔
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 - correct answer ✔✔
Which of these are used as measurements for determining 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 pressure - correct answer ✔✔
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 - correct answer ✔✔
A 100 ton evaporator is operating at -40deg F with the condenser operating at 95deg F. Considering
energy consumption only, which of these arrangements would have the lowest energy use when
operating?
A. Single stage centrifugal
B. Single stage piston machines
