Topics: All categories in the pool
1: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
2: How many volts would you read on a 480V system phase to phase?
- 277
- 480
- 1/3 the voltage
3: A secondary coolant is defined as
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- a low temperature refrigerant used for cascading systems
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- any refrigerant direcly in contact with the cooling space for process cooling
4: The External equalizer of a TXV compensates for
- pressure within the system
- pressure drop across the evaporator coil
- pressure within the evaporator
- pressure drop across the condenser coil
5: On a large centrifugal system, what meters the flow to the evaporator?
- Cap tube.
- High side float
- TXV
- Low side float
6: Relief valves are rated in
- pounds of air per hour
- gallons of water per hour
- pounds of air per minute
- gallons of water per minute
7: If two 500 ohm resistors are connected in series, the resistance will be
- 20 ohms
- 500 ohms
- 1000 ohms
- 200 ohms
8: Clearance volume
- varies depending on compressor speed
- is the same on all compressors
- has no effect on compressor capacity
- affects compressor capacity
9: What is NOT a positive displacement compressor.
- Centrifugal
- Scroll
- Reciprocating
- Rotary
10: While water is evaporated in an evaporative condenser the impurities which were in the water are
- accumulate in the sump water
- blown to the atmosphere by the fan
- remain in the air
- washed out of the air by the spray pump
11: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
- no
- yes
12: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- B-2
- A-2
- A-1
13: How many gallons of water do you need per pound of ammonia?
- 50
- 10
- 1
- 100
14: A split-phase motor has a ______ winding and a ____ winding
- run, common
- duel-run, duel-start
- run, start
- start, common
15: The leaving chilled water set point for comfort cooling is typically?
- 66
- 38
- 60
- 45
16: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
17: Who is permitted to access a refrigeration machine room?
- Any employee
- Anyone, it's a completely safe area
- Contractors only
- Authorized persons only
18: Evaporators within 18" of a heating coil must be equipped with a
- zone valve
- pressure relief device
- high limit control
- low limit control
19: Electricity involves the movement of electrons in atoms
- True
- False
20: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-11
- R-134A
- R-22
21: Which of the following is not an air velocity meter?
- Velometer
- Anemometer
- Anemotherm
- Hydrometer
22: one BTU equals
- 3.41 hp
- 31.4 hp
- Pi
- 12,000 hp
23: If the power element of an expansion valve should lose its charge the valve would
- go open
- go closed
- overfeed the evaporator
- underfeed the evaporator
24: The heat picked up in the evaporator must equal to
- the heat of compression
- the heat lost by the medium being cooled
- the heat gained by the condenser
- the heat giving by the condenser
25: B3 refrigerants are considered
- non-toxic but flammable
- non-toxic but non-flammable
- toxic and highly flammable
- toxic but non-flammable