Topics: All categories in the pool
1: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
2: If your suction line is warmer than the room temperature, this may indicate
- a low charge
- plugged air filter
- an over charge
- below normal superheat
3: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 18"
- 12"
- 36"
4: Ammonia belongs to Group
- B-1
- A-2
- A-1
- B-2
5: A Lithium-bromide system is an absorption system that
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
6: How many volts would you read on a 480V system phase to phase?
- 0
- 277
- 480
- 1/3 the voltage
7: "I" represents ____ in the Ohm's law formula.
- resistance
- amperage
- capacitance
- voltage.
8: What device should be used on low-temperature freezers?
- discharge muffler
- high capacity TXV
- oil separator
- hot-gas by-pass
9: A run capacitor is wired in series with the _____ windings.
- start
- start capacitor
- run
- common
10: How many flammability classifications are refrigerants in?
- 5
- 7
- 3
- 2
11: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
12: Two systems using separate refrigerants that are superimposed upon one another is called
- indirect
- cascade
- single stage
- booster
13: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
14: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
15: Which refrigerant is lighter than air?
- R-717
- R-134a
- R-11
- R-123
16: What is considered a cooling agent?
- any liquid used for the transmission of heat when condensation occur
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
17: Where is the high-side float located on a chiller system?
- liquid line
- discharge line
- flash line
- inside the chiller barrel
18: The heat picked up in the evaporator must equal to
- the heat gained by the condenser
- the heat giving by the condenser
- the heat of compression
- the heat lost by the medium being cooled
19: How would you know if there was a loss of crankcase pressure?
- oil will foam
- oil level will rise
- oil will thin out
- oil will thicken
20: Class 3 refrigerants are
- toxic
- non-toxic
- highly flammable
- non-flammable
21: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
22: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 1000 psig
- 200 psig
- 600 psig
23: A pressure relief should be located at least _______ from windows and doors.
- 15'
- 25'
- 20'
- 30'
24: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- increases
- run as designed with low ambient controls
- decreases
- doesn't change
25: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 200
- 330
- 100