Topics: All categories in the pool
1: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- outlet of low temperature evaporator
- inlet of the low temperature evaporator.
- outlet of the liquid line
2: How many refrigerant classifications are there for flammability?
- 2
- 1
- 7
- 3
3: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
4: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Therm
- 1 BTU
- 1 Kelvin
- The rate of conduction
5: Volts x amps equals
- Ohms Law
- Inductance
- Impedance
- Watts
6: The proper location for an oil separator is between the
- compressor and condenser
- receiver and metering device
- evaporator and compressor
- condenser and receiver
7: How many gallons of water per pound of ammonia do you need?
- 1
- 5
- 20
- 15
8: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
9: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
10: The heat picked up in the evaporator must equal to
- the heat lost by the medium being cooled
- the heat of compression
- the heat giving by the condenser
- the heat gained by the condenser
11: How many flammability classifications are refrigerants in?
- 2
- 5
- 7
- 3
12: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
13: How are safety controls wired in a circuit?
- Either series or parallel
- Series
- Parallel
- Series/parallel
14: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 125 psig
- 255 psig
- 365 psig
- 327 psig
15: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 0F-38F
- 30F to 50F
- -40F to 0F
- -100F to -40F
16: R-12 is
- dichloromethane
- trichlorofluoromethane
- dichlorodifluoromethane
- dichlorofluoromethane
17: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 120 lbs
- 55 lbs
18: A start capacitor is wired in _____ with the start windings.
- series-parallel
- series
- parallel
- junction
19: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 330 lbs
- 660 lbs
- 55 lbs
20: Ammonia is under what safety classification?
- A3
- B2
- B3
- B1
21: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
- you can't change refrigerants
22: A pressure relief should be located at least _______ from windows and doors.
- 30'
- 20'
- 25'
- 15'
23: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type switch that stops the compressor when the pressure on the high side becomes too high
24: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
25: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b