Topics: All categories in the pool
1: What is a high-side float?
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
2: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- moisture in the system
- low head pressure
- not enough oil in the system
- oil in evaporator
3: A low oil switch is typically
- non used on semi-hermetic compressors over 10 ton capacity
- manual reset
- automatic reset
- time-delay auto reset
4: How many volts would you read on a 480V system phase to phase?
- 1/3 the voltage
- 480
- 277
5: Booster compressors connect to the ____ side of the compressor
- low side
- liquid
- vapor
- oil side
6: 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
7: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Upon installation
- Not required
- Annually
8: What is the typical air conditioning operating pressures for R-22?
- 60 psi suction 210 psi discharge
- 25 psi suction 125 psi discharge
- 105 psi suction 340 psi discharge
- None of the above
9: Mercury was used in thermometers primarily because it
- vaporizes at very high temperatures
- never freezes
- was inexpensive
- expands uniformly
10: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 80%
- 90%
- 75%
- 100%
11: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 2
- 3
- 5
12: Who authorizes changes to the safety codes?
- Person who pulled the permit
- Person in charge of the facility
- Board of Boilers
- Contractor who last serviced the system.
13: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 9 ASHRAE-15 ASME VIII unfired
14: A water regulating valve opens when
- when the power is on there is an overcharge of refrigerant
- the head pressure rises
- the compressor is on
- when the power is on
15: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Heat
- Oil
- Electricity
- Air
16: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
17: How many refrigerant classifications are there for toxicity?
- 5
- 2
- 1
- 3
18: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 100
- 24
- 50
- 75
19: The outer portion of shell of the compressor used on low-pressure chillers is called the
- suction
- baffle
- nozzle
- volute
20: The freezing point of water at sea level is?
- 32F
- 32C
- -10C
- 0F
21: A start capacitor is wired in _____ with the start windings.
- series
- parallel
- series-parallel
- junction
22: Which of the following is not an air velocity meter?
- Anemotherm
- Velometer
- Hydrometer
- Anemometer
23: Refrigerants shall be classified by
- toxicity and flammability
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
- color codes
24: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
25: What does an anemometer measure?
- temperature
- amperage
- voltage
- velocity