Topics: All categories in the pool
1: Which refrigerant replaced R-12?
- R-410A
- R-134A
- R-22
- R-407A
2: Ammonia (NH3) is a group III refrigerant
- True
- False
3: 746 watts is equal to
- 1 hp
- Pi
- 100 hp
- 10 hp
4: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 90%
- 80%
- 100%
- 75%
5: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
- over pressure protection
6: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the aggregate of the high side and low side
- the high side
- the low side
- 2.5 times the design pressure
7: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- design pressure
- high pressure
- critical pressure
- low pressure
8: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
9: A water regulating valve opens when
- the head pressure rises
- when the power is on
- the compressor is on
- when the power is on there is an overcharge of refrigerant
10: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
11: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- increases
- doesn't change
- run as designed with low ambient controls
- decreases
12: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 20 uf
- 40 uf
- 25 uf
- 15 uf
13: What type of material can't be used on the outlet of a relief valve?
- Magnesium alloy
- Stainless steel
- PVC
- Copper
14: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 108
- 116
- 88
- 38
15: The first step in mechanical refrigeration is
- condensation
- compression
- evaporation
- expansion
16: The generator shell contains the
- condenser and the absorber
- condenser, the evaporator, and the generator
- condenser and the generator
- evaporator and the absorber
17: What would be the classification of a church?
- Large mercantile
- Institutional
- Industrial
- Place of assembly
18: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- mixed occupancy
- institutional occupancy
- commercial occupancy
- public assembly occupancy
19: On a single phase motor, when does the start winding cut out?
- 25% of its RLA speed
- 100% of its RLA speed
- 75% of its RLA speed
- 50% of its RLA speed
20: Where a refrigeration or air conditioning system is installed,
- The company who installed the system must notify the fire department in the jurisdiction where installed
- it shall not be operated below prescribed pressuers
- the form or certificate shall be authorized by the Department of Public Safety
- A field inspection shall be made before it is put into service
21: A device used to measure small pressure differences is the
- pyrometer
- phsycometirc
- manometer
- anemometer
22: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 6.6
- 110
- 1,000
- 330
23: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- commercial occupancy
- public assembly occupancy
- illegal occupancy
- institutional occupancy
24: Fractionation occurs when
- the pressures increase as the heat load increases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- the pressures decreases as the heat load decreases
- when a fraction of refrigerant is added as the full charge
25: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above