Topics: All categories in the pool
1: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low suction pressure
- low pressure chillers do not have purge units
- increased capacity
- high head pressure
2: A Low-Probability System
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
3: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 24
- 48
- 18
4: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- critical pressure
- high pressure
5: Ammonia can come in contact with _______ ?
- Brass
- Copper
- Aluminum
- Copper tubing
6: B3 refrigerants are considered
- toxic but non-flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic and highly flammable
7: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
8: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
- the gas returns to a liquid
- the gas is no longer saturated
9: How are safety controls wired in a circuit?
- Parallel
- Series
- Series/parallel
- Either series or parallel
10: Where is the high-side float located on a chiller system?
- liquid line
- flash line
- inside the chiller barrel
- discharge line
11: An accumulator can be located between the
- condenser and evaporator
- first stage and second stage compressors
- evaporator and compressor
- compressor and condenser
12: Who authorizes changes to the safety codes?
- Board of Boilers
- Person who pulled the permit
- Contractor who last serviced the system.
- Person in charge of the facility
13: 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
14: Which refrigerant class listed below is the most flammable?
- A-1
- A-3
- B-2
- C-3
15: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
16: An electronic bridge circuit is basically a
- Wheatstone
- 24 volt control circuit
- suspension
- high voltage circuit
17: The outer portion of shell of the compressor used on low-pressure chillers is called the
- suction
- baffle
- volute
- nozzle
18: The reversing valve is commonly used
- when the code requires a check valve
- on commercial system that involve two different temperatures
- on multiple compressor systems
- on all heat pumps
19: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 600F
- 700F
- 800F
- 1000F
20: The main purpose of the accumulator is to
- prevent liquid slugs at the compressor
- store liquid refrigerant
- provide space for the accumulation of oil and containminants
- provide space for vapor to accumulate
21: Humidity can be sensed with
- human hair
- bimetal
- thermometer
- pressure bellows
22: The freezing point of water at sea level is?
- 0F
- -10C
- 32F
- 32C
23: The formula for Pure Power in a resistance circuit is
- Watts X amps.
- Watts = volts X amps
- Kw = volts X amps
- Watts X power factor
24: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Heat
- Oil
- Electricity
- Air
25: The difference between saturated liquid and saturated vapor is
- heat
- pressure
- volume
- temperature