Topics: All categories in the pool
1: A professional or office building would be considered what type of occupancy?
- mercantile
- commercial
- public assembly
- business
2: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
3: A rule of thumb in air conditioning is ____ CFM per ton?
- 600
- 100
- 400
- 500
4: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- breaker panel in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- load-side of the contactor in
5: Which of the following is not an air velocity meter?
- Hydrometer
- Anemometer
- Velometer
- Anemotherm
6: "P" represents ______ in the Watt's law formula
- amperage
- watts
- voltage
- reactance
7: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's water
- Because it's a non-flammable refrigerant
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
8: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- outdoors
- unoccupied spaces
9: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
10: A motor starter contains a thermal overload and a
- 3-way relay
- solenoid
- contactor
- transformer
11: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 155F
- 32F
- 45F
- 158F
12: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- strong solution
- absorbed solution
- weak solution
- concentrated solution
13: Low ambient controls are used when
- always
- when systems run all year round
- on air conditioning systems only
- economizers are used
14: Adjusting the spring pressure on a TXV
- makes no difference
- changes superheat
- adjusts the bulb charge
- changes subcooling
15: How is bring measured?
- manometer
- hygrometer
- hydrometer
- anemometer
16: 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
17: In an electrical circuit, what is potential measured in?
- Volts
- Amps
- Ohms
- Herys
18: What is the boiling point of refrigerant governed by?
- Compressor RPM's
- Condenser sub-cooling
- P&T relationship
- Evaporator temperature
19: The difference between saturated liquid and saturated vapor is
- heat
- volume
- temperature
- pressure
20: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
21: The low pressure oil safety switch
- never trips
- resets itself after the time delay has terminated
- resets itself automatically
- must be reset manually
22: How many volts would you read on a 480V system phase to phase?
- 0
- 1/3 the voltage
- 277
- 480
23: Fractionation occurs when
- the pressures decreases as the heat load decreases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- when a fraction of refrigerant is added as the full charge
- the pressures increase as the heat load increases
24: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Relief valve
- Circuit Breaker
- Temperature limiter device
- T&P device
25: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above