ESCO Light Commercial Air Conditioning
(Refrigeration Systems)
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS Guaranteed Pass First
Attempt!! Current Update!!
1. Approximately how much Air flow is required across an air cooled
condenser? - Correct Answer: 750-1000 CFM Per Ton of Cooling
Capacity
2. A sling psycrometer is used to measure.....? - Correct Answer: Wet and
dry bulb temperature
3. The capacity of an evaporative condenser depends on....? - Correct
Answer: the wet-bulb temperature of the entering air
4. Hot Gas Bypass refers to....? - Correct Answer: Preventing low suction
pressure / Preventing Compressor short Cycling
5. A compressor is operating with a discharge pressure of 185.3 PSIG and a
suction pressure of 25.3 PSIG. The compression ratio (Pumping Ratio) is.....?
- Correct Answer: 5:1
,6. Wet bulb depression is.....? - Correct Answer: Difference between dry-
bulb and wet-bulb temperatures.
7. A compressor net oil pressure is determined by.....? - Correct Answer:
subtracting the Crankcase (suction) pressure from the discharge port
pressure.
8. Some compressors are fitted with an unloading device ? - Correct
Answer: provide varible capacity
9. Refrigerant in the suction line should be slightly superheated in order
to.......? - Correct Answer: Insure liquid refrigerant does not enter the
compressor
10.A decrease in water flow, when using a water cooled condenser....? -
Correct Answer: increases the power consumption of the compressor. /
High head pressure
11.If a TEV sensing bulb lost its charge, what effect would this moment have on
the AC system - Correct Answer: Low suction pressure Low head
pressure
12.The amount of heat absorbed in the evaporator is equal to....? - Correct
Answer: The heat in the conditioned space
, 13.Approximately how much airflow is required across the evaporator per ton
of cooling capacity? - Correct Answer: 350-400 CFM Per Ton
14.The most reliable and safest method of field charging a system is.....? -
Correct Answer: To charge by weight according to manufacturer
specifications
15.On split system installations, the suction line should be pitched towards the
compressor at least....? - Correct Answer: one inch per ten feet. (1 in/10
ft)
16.Polyolester oils---? - Correct Answer: All of Above (hold moisture tightly,
so more evacuation time may be necessary, Have similar lubricity and
miscibility characteristics as mineral oil, and Absorb atmospheric moisture
more easily than mineral oil)
17.one pound of evaporating water can absorb....? - Correct Answer: 970
BTU's
18.Depending on the application, the suction lines may be ______________ to
assure proper oil return. - Correct Answer: trapped or sloped
19.When an AC unit has a suction line that is frosted up on the compressor,
what faults could occur? - Correct Answer: All of Above (Bad indoor
blower relay, a plugged Air Filter, or A dirty evaporator Coil)
(Refrigeration Systems)
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS Guaranteed Pass First
Attempt!! Current Update!!
1. Approximately how much Air flow is required across an air cooled
condenser? - Correct Answer: 750-1000 CFM Per Ton of Cooling
Capacity
2. A sling psycrometer is used to measure.....? - Correct Answer: Wet and
dry bulb temperature
3. The capacity of an evaporative condenser depends on....? - Correct
Answer: the wet-bulb temperature of the entering air
4. Hot Gas Bypass refers to....? - Correct Answer: Preventing low suction
pressure / Preventing Compressor short Cycling
5. A compressor is operating with a discharge pressure of 185.3 PSIG and a
suction pressure of 25.3 PSIG. The compression ratio (Pumping Ratio) is.....?
- Correct Answer: 5:1
,6. Wet bulb depression is.....? - Correct Answer: Difference between dry-
bulb and wet-bulb temperatures.
7. A compressor net oil pressure is determined by.....? - Correct Answer:
subtracting the Crankcase (suction) pressure from the discharge port
pressure.
8. Some compressors are fitted with an unloading device ? - Correct
Answer: provide varible capacity
9. Refrigerant in the suction line should be slightly superheated in order
to.......? - Correct Answer: Insure liquid refrigerant does not enter the
compressor
10.A decrease in water flow, when using a water cooled condenser....? -
Correct Answer: increases the power consumption of the compressor. /
High head pressure
11.If a TEV sensing bulb lost its charge, what effect would this moment have on
the AC system - Correct Answer: Low suction pressure Low head
pressure
12.The amount of heat absorbed in the evaporator is equal to....? - Correct
Answer: The heat in the conditioned space
, 13.Approximately how much airflow is required across the evaporator per ton
of cooling capacity? - Correct Answer: 350-400 CFM Per Ton
14.The most reliable and safest method of field charging a system is.....? -
Correct Answer: To charge by weight according to manufacturer
specifications
15.On split system installations, the suction line should be pitched towards the
compressor at least....? - Correct Answer: one inch per ten feet. (1 in/10
ft)
16.Polyolester oils---? - Correct Answer: All of Above (hold moisture tightly,
so more evacuation time may be necessary, Have similar lubricity and
miscibility characteristics as mineral oil, and Absorb atmospheric moisture
more easily than mineral oil)
17.one pound of evaporating water can absorb....? - Correct Answer: 970
BTU's
18.Depending on the application, the suction lines may be ______________ to
assure proper oil return. - Correct Answer: trapped or sloped
19.When an AC unit has a suction line that is frosted up on the compressor,
what faults could occur? - Correct Answer: All of Above (Bad indoor
blower relay, a plugged Air Filter, or A dirty evaporator Coil)
