Topics: All categories in the pool
1: The proper location for an oil separator is between the
- compressor and condenser
- condenser and receiver
- receiver and metering device
- evaporator and compressor
2: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
3: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- critical pressure
- high pressure
- design pressure
4: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- start the fan and circulating pump
- reset the expansion valve
- start the comrpessor
- reset the safety valve
5: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
6: Sensible heat is the heat added to a substance to
- cause evaporation
- change its state
- raise its temperature
- freeze it
7: Class A refrigerants are considered
- flammable
- non-toxic
- toxic
- non-flammable
8: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
9: How many volts would you read on a 480V system phase to phase?
- 1/3 the voltage
- 277
- 480
10: Secondary refrigerants are usually
- water or brine
- expensive
- Prestone anti-freeze
- alcohol
11: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- automatic ventilation
- tight fitting doors
- self-closing doors
12: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
13: Where is an EPR valve located on a multi-evaporator system?
- Suction line at the compressor
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the coolest evaporator
- Suction line of the warmest evaporator
14: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
15: "R" represents ___ in the Ohm's law formula
- resistance
- amperage
- voltage
- capacitance
16: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 88
- 38
- 96
- 58
17: An air conditioning system rated for 36,000 BTU's is equivalent to
- two tons of cooling
- one ton of cooling
- 12,000 tons of cooling
- three tons of cooling
18: "P" represents ______ in the Watt's law formula
- amperage
- reactance
- watts
- voltage
19: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
20: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
21: Which refrigerant class listed below is the most flammable?
- A-1
- B-2
- C-3
- A-3
22: How are refrigerant blends classified?
- Based on best case Fractionation
- Blends don't have to be classified
- Based on worst case fractionation
- Based on the oil used
23: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
24: Where a refrigeration or air conditioning system is installed,
- A field inspection shall be made before it is put into service
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
- it shall not be operated below prescribed pressuers
25: What is Absolute Zero?
- -460F
- -773F
- -640F
- -400F