Topics: All categories in the pool
1: Class A refrigerants are considered
- non-toxic
- toxic
- flammable
- non-flammable
2: What must be done to refrigerant pipes before being buried?
- Leaked checked
- Encased
- Coated
- Certified
3: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class B machinery room
- Class M machinery room
- Class A machinery room
4: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 240 volts
- 2.40 volts
- 2,400 volts
- 24.0 volts
5: By using nitrogen within a pipe during brazing operation,
- The explosion hazard is confined
- Exterior scale formation is minimized
- Discoloration is prevented
- Copper oxide formation is prevented
6: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the AHJ to let them know that the system been inspected
7: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
8: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
9: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When there are sprinklers above
- When there is a space 6' or more above it
- When it's used as part of a supply or return air system
10: At higher altitudes, the boiling point of refrigerant is
- equal to the coefficient of water at 32F
- the same
- lower
- higher
11: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- purge
- surge
- splurge
- merge
12: The External equalizer of a TXV compensates for
- pressure within the system
- pressure drop across the condenser coil
- pressure drop across the evaporator coil
- pressure within the evaporator
13: What is potential measured in?
- Amps
- Volts
- Henrys
- Ohms
14: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
15: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
16: What is not a requirement of a class T machine room?
- tight fitting doors
- fire hose connection to the building fire protection system
- automatic ventilation
- self-closing doors
17: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 20 amps
- There isn't enough information to answer.
- 24 amps
- 10 amps
18: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 71 ohms
- 27 ohms
- 104 ohms
- 80 ohms
19: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- flash line
- discharge line
- liquid line
20: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
21: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- Ceiling height
- 72"
- 7.25'
22: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- refrigerant control
- capacity control
23: Low pressure systems have what kind of compressor?
- Rotary
- Scroll
- Centrifugal
- Reciprocating
24: The density of a gas refers to
- pounds per absolute pressure
- cubic feet per pound
- pounds per cubic foot
- pounds per square foot
25: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b