Topics: All categories in the pool
1: A VRF system is a direct system
- true
- false
2: Which refrigerant replaced R-12?
- R-407A
- R-410A
- R-22
- R-134A
3: Most CFC's are
- inert but toxic
- inert
- toxic
- flammable
4: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
5: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
6: Which winding have the most turns?
- they have equal amount of turns
- run
- depends on the motor phase
- Start
7: Pressure vessels having an inside diameter of 6” or less shall be protected by
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
- either a fusible plug or a pressure relief device
- a fusible plug
8: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
9: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 77F
- 70F
- 32F
- 58F
10: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 24
- 18
- 15
11: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- Copper
- PVC
- Magnesium alloy
12: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Glove valve
- Fusible plug
- Rupture disk
13: A split-phase motor has a ______ winding and a ____ winding
- run, start
- run, common
- duel-run, duel-start
- start, common
14: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
15: Where would the EPR valve be located on a multiple evaporator system?
- outlet of low temperature evaporator
- inlet of the low temperature evaporator.
- outlet of high temperature evaporator
- outlet of the liquid line
16: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
17: Control systems can be classified by
- source of power
- economy of operation
- safety
- tonnage of system
18: The generator shell contains the
- evaporator and the absorber
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator
19: How many closing forces operate a thermostatic expansion valve?
- 2
- 1
- 3
- 4
20: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
21: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When it's used as part of a supply or return air system
- When its white
- When there is a space 6' or more above it
- When there are sprinklers above
22: If the spring is adjusted to increase the superheat, this new setting will
- have no effect on the frost line
- shorten the frost line
- allow more liquid into the evaporator
- lengthen the frost line
23: A motor starter contains a thermal overload and a
- contactor
- solenoid
- transformer
- 3-way relay
24: What is the state of the refrigerant leaving the evaporator?
- a low temperature subcooled liquid
- a high temperature superheated vapor
- low temperature superheated vapor
- a high temperature subcooled liquid
25: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 6.6
- 330
- 110