Topics: All categories in the pool
1: Refrigerant restricted in 2004 but used for transition for decades:
- R-11
- R-123
- R-134A
- R-22
2: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
3: The discharge relief valve is located (9.4.6)
- between the compressor and reciever
- between the compressor and oil separator
- between the compressor and the stop valve
- on top of the condensor
4: An accumulator can be located between the
- condenser and evaporator
- compressor and condenser
- first stage and second stage compressors
- evaporator and compressor
5: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 2 months
- 14 days
- 1 week
6: The generator shell contains the
- condenser, the evaporator, and the generator
- evaporator and the absorber
- condenser and the absorber
- condenser and the generator
7: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- blue
- red
- green
- orange
8: How much refrigerant can be stored in a mechanical room outside of the system?
- 200
- 150
- 100
- 330
9: The actual expansion curve of compressor follows most nearly which one of the following
- Pressure-Temperature
- Volume
- Isothermal
- Adiabatic
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: A start capacitor in series with a start winding will
- increase running efficiency
- decrease the amp draw of the motor
- increase starting torque
- increase the amp draw of the motor
12: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
13: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 10 amps
- 20 amps
- 5 amps
- 15 amps
14: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
15: Relief valves are rated in
- gallons of water per minute
- gallons of water per hour
- pounds of air per hour
- pounds of air per minute
16: Name a reason that does not cause reduced condenser air quantity
- High ambient temperature
- Prevailing winds
- Dirty Coil
- Dirty fan blades
17: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
18: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
19: Suction line oil traps should be installed when the condenser is
- in the basement and the evaporator is on the third floor
- on the third floor roof and the evaporator is in the basement
- more than 100' away from the evaporator
- located outside the operates in temperatures below 35F
20: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 20'
- At least 40'
- At least 30'
21: Halogen refrigerants are corrosive to which type of metal?
- copper
- stainless steel
- black iron
- magnesium
22: A restaurant is classified as a
- public assembly occupancy
- commercial occupancy
- mixed occupancy
- large mercantile occupancy
23: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
24: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 80 ohms
- 27 ohms
- 71 ohms
- 104 ohms
25: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.