Refrigeration & Air Conditioning interview questions

1. A.R-22 phase-out under the Montreal Protocol and HFC reduction under the Kigali Amendment are driving Indian ACs to R-32 and R-290
2. B.refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
3. C.ratio of refrigerating effect to compressor work, above 1 for a refrigerator and exactly one more for the same machine used as a heat pump
4. D.cooling liquid refrigerant below its saturation temperature before expansion, increasing refrigerating effect without extra compressor work

Answer + AI explanation with Pro

1. A.Wet bulb temperature
2. B.Coefficient of performance
3. C.Bypass factor
4. D.Subcooling

Answer + AI explanation with Pro

1. A.Coefficient of performance — refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
2. B.Coefficient of performance — reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
3. C.Coefficient of performance — ratio of refrigerating effect to compressor work, above 1 for a refrigerator and exactly one more for the same machine used as a heat pump
4. D.Coefficient of performance — cooling liquid refrigerant below its saturation temperature before expansion, increasing refrigerating effect without extra compressor work

Answer + AI explanation with Pro

1. A.cooling rate of 3.517 kW (211 kJ/min), the heat needed to melt one US ton of ice in 24 hours
2. B.fraction of air that passes through a cooling coil unchanged, lower for deeper coils with more rows and fins per inch
3. C.two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio
4. D.refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve

Answer + AI explanation with Pro

1. A.Bypass factor
2. B.Subcooling
3. C.Ton of refrigeration
4. D.Coefficient of performance

Answer + AI explanation with Pro

1. A.Ton of refrigeration — refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
2. B.Ton of refrigeration — cooling rate of 3.517 kW (211 kJ/min), the heat needed to melt one US ton of ice in 24 hours
3. C.Ton of refrigeration — two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio
4. D.Ton of refrigeration — reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation

Answer + AI explanation with Pro

1. A.cooling liquid refrigerant below its saturation temperature before expansion, increasing refrigerating effect without extra compressor work
2. B.refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
3. C.reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
4. D.ratio of refrigerating effect to compressor work, above 1 for a refrigerator and exactly one more for the same machine used as a heat pump

Answer + AI explanation with Pro

1. A.Ton of refrigeration
2. B.Wet bulb temperature
3. C.Evaporator superheat
4. D.Refrigerant phase-down

Answer + AI explanation with Pro

1. A.Wet bulb temperature — refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
2. B.Wet bulb temperature — ratio of sensible to total cooling load, which fixes the slope of the room process line on the psychrometric chart
3. C.Wet bulb temperature — reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
4. D.Wet bulb temperature — two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio

Answer + AI explanation with Pro

1. A.refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
2. B.two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio
3. C.ratio of refrigerating effect to compressor work, above 1 for a refrigerator and exactly one more for the same machine used as a heat pump
4. D.cooling liquid refrigerant below its saturation temperature before expansion, increasing refrigerating effect without extra compressor work

Answer + AI explanation with Pro

1. A.Refrigerant phase-down
2. B.Ton of refrigeration
3. C.Subcooling
4. D.Bypass factor

Answer + AI explanation with Pro

1. A.Subcooling — refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
2. B.Subcooling — cooling liquid refrigerant below its saturation temperature before expansion, increasing refrigerating effect without extra compressor work
3. C.Subcooling — reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
4. D.Subcooling — cooling rate of 3.517 kW (211 kJ/min), the heat needed to melt one US ton of ice in 24 hours

Answer + AI explanation with Pro

1. A.ratio of sensible to total cooling load, which fixes the slope of the room process line on the psychrometric chart
2. B.fraction of air that passes through a cooling coil unchanged, lower for deeper coils with more rows and fins per inch
3. C.two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio
4. D.refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve

Answer + AI explanation with Pro

1. A.Ton of refrigeration
2. B.Sensible heat factor
3. C.Cascade refrigeration
4. D.Evaporator superheat

Answer + AI explanation with Pro

1. A.Evaporator superheat — cooling liquid refrigerant below its saturation temperature before expansion, increasing refrigerating effect without extra compressor work
2. B.Evaporator superheat — refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
3. C.Evaporator superheat — fraction of air that passes through a cooling coil unchanged, lower for deeper coils with more rows and fins per inch
4. D.Evaporator superheat — two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio

Answer + AI explanation with Pro

1. A.refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
2. B.cooling rate of 3.517 kW (211 kJ/min), the heat needed to melt one US ton of ice in 24 hours
3. C.ratio of sensible to total cooling load, which fixes the slope of the room process line on the psychrometric chart
4. D.cooling liquid refrigerant below its saturation temperature before expansion, increasing refrigerating effect without extra compressor work

Answer + AI explanation with Pro

1. A.Cascade refrigeration
2. B.Evaporator superheat
3. C.Subcooling
4. D.Sensible heat factor

Answer + AI explanation with Pro

1. A.Sensible heat factor — ratio of sensible to total cooling load, which fixes the slope of the room process line on the psychrometric chart
2. B.Sensible heat factor — refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
3. C.Sensible heat factor — reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
4. D.Sensible heat factor — R-22 phase-out under the Montreal Protocol and HFC reduction under the Kigali Amendment are driving Indian ACs to R-32 and R-290

Answer + AI explanation with Pro

1. A.refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
2. B.two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio
3. C.reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
4. D.fraction of air that passes through a cooling coil unchanged, lower for deeper coils with more rows and fins per inch

Answer + AI explanation with Pro

1. A.Cascade refrigeration
2. B.Ton of refrigeration
3. C.Subcooling
4. D.Bypass factor

Answer + AI explanation with Pro

1. A.Bypass factor — reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
2. B.Bypass factor — R-22 phase-out under the Montreal Protocol and HFC reduction under the Kigali Amendment are driving Indian ACs to R-32 and R-290
3. C.Bypass factor — cooling rate of 3.517 kW (211 kJ/min), the heat needed to melt one US ton of ice in 24 hours
4. D.Bypass factor — fraction of air that passes through a cooling coil unchanged, lower for deeper coils with more rows and fins per inch

Answer + AI explanation with Pro

1. A.R-22 phase-out under the Montreal Protocol and HFC reduction under the Kigali Amendment are driving Indian ACs to R-32 and R-290
2. B.refrigerant leaving the evaporator a few degrees above saturation so no liquid enters the compressor, set by the thermostatic expansion valve
3. C.reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
4. D.two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio

Answer + AI explanation with Pro

1. A.Refrigerant phase-down
2. B.Cascade refrigeration
3. C.Sensible heat factor
4. D.Subcooling

Answer + AI explanation with Pro

1. A.Refrigerant phase-down — reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
2. B.Refrigerant phase-down — R-22 phase-out under the Montreal Protocol and HFC reduction under the Kigali Amendment are driving Indian ACs to R-32 and R-290
3. C.Refrigerant phase-down — ratio of refrigerating effect to compressor work, above 1 for a refrigerator and exactly one more for the same machine used as a heat pump
4. D.Refrigerant phase-down — cooling liquid refrigerant below its saturation temperature before expansion, increasing refrigerating effect without extra compressor work

Answer + AI explanation with Pro

1. A.reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
2. B.fraction of air that passes through a cooling coil unchanged, lower for deeper coils with more rows and fins per inch
3. C.two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio
4. D.R-22 phase-out under the Montreal Protocol and HFC reduction under the Kigali Amendment are driving Indian ACs to R-32 and R-290

Answer + AI explanation with Pro

1. A.Subcooling
2. B.Ton of refrigeration
3. C.Bypass factor
4. D.Cascade refrigeration

Answer + AI explanation with Pro

1. A.Cascade refrigeration — ratio of sensible to total cooling load, which fixes the slope of the room process line on the psychrometric chart
2. B.Cascade refrigeration — reading of a thermometer whose bulb is covered by a wet wick in moving air, approaching dry bulb as the air nears saturation
3. C.Cascade refrigeration — two cycles with different refrigerants coupled through a heat exchanger to reach −50 °C and below where one refrigerant would need an excessive pressure ratio
4. D.Cascade refrigeration — ratio of refrigerating effect to compressor work, above 1 for a refrigerator and exactly one more for the same machine used as a heat pump

Answer + AI explanation with Pro