Topics: All categories in the pool
1: The two float-type metering devices are the
- liquid float and the low-side float
- vapor float and the low-side float.
- high-side float and the low-side float
- liquid float and the vapor float
2: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
3: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 20
- 75
- 50
- 15
4: What is a Category "M" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump systems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- Any fluid that exceeds 150 psig and has design temperatures over 366F
5: Bubbles in the liquid line sight glass could be caused by
- plugged drier
- bad low pressure switch
- overcharge of oil
- leaking discharge valves in the compressor
6: Ammonia belongs to Group
- A-2
- B-1
- A-1
- B-2
7: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe as you would measure it
- the total length of pipe plus equivalent-length of fittings
8: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
9: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 550 lbs
- 330 lbs.
- 660 lbs
10: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- first disconnect in
- breaker panel in
- load-side of the contactor in
- 24 volt secondary side of the Class 2 transformer to the thermostat
11: An electronic bridge circuit is basically a
- high voltage circuit
- Wheatstone
- suspension
- 24 volt control circuit
12: R-123 belongs to Group
- B-3
- B-1
- B-2
- A-3
13: What is the minimum size wire you can use on a 30 amp circuit?
- 16 AWG
- 12 AWG
- 14 AWG
- 10 AWG
14: A motor starter contains a thermal overload and a
- solenoid
- contactor
- 3-way relay
- transformer
15: Usually dry bulb temperature is
- lower than dry bulb temperature
- same as wet bulb temperature
- higher than wet bulb temperature
- not important and shall be ignored
16: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
17: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 20
- 15
- 25
- 10
18: A secondary coolant is defined as
- a low temperature refrigerant used for cascading systems
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- 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
19: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- sensible heat
- latent heat
- specific heat
- lost heat
20: What device measures the specific gravity of a substance?
- Thermometer
- Hygrometer
- Hydrometer
- Manometer
21: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
22: How many square inches per square foot?
- 144
- 24
- 98
- 64
23: A start capacitor is wired in _____ with the start windings.
- junction
- series-parallel
- series
- parallel
24: The discharge relief valve is located (9.4.6)
- between the compressor and the stop valve
- between the compressor and reciever
- on top of the condensor
- between the compressor and oil separator
25: Class A refrigerants are considered
- non-toxic
- non-flammable
- toxic
- flammable