Topics: All categories in the pool
1: The two float-type metering devices are the
- liquid float and the low-side float
- liquid float and the vapor float
- vapor float and the low-side float.
- high-side float and the low-side float
2: How are a compressor and condenser fan wired?
- series
- parallel
- parallel-series
- series-parallel
3: Humidity can be sensed with
- thermometer
- pressure bellows
- bimetal
- human hair
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
- 24.0 volts
- 2.40 volts
- 240 volts
- 2,400 volts
5: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
6: The freezing point of water at sea level is?
- 32C
- -10C
- 32F
- 0F
7: What is a Category "M" fluid?
- A typical refrigerant used on newer air conditioning and heat pump systems
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- 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 toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
8: What happens after your initial inspection of a pressure vessel?
- Inspector leaves a metal tag with a certification listed on it
- 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.
- Notify the AHJ to let them know that the system been inspected
9: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 cubic feet or more
- 3 cubic feet or more
- 15 square feet or less
10: It takes how many BTU/hr to melt one pound of ice at 32F
- 970
- 180
- 212
- 144
11: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- 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
12: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-1
- A-2
- B-2
13: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 55 lbs
- 550 lbs
- 330 lbs.
14: Suction line oil traps should be installed when the condenser is
- on the third floor roof and the evaporator is in the basement
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
15: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- illegal occupancy
- public assembly occupancy
- institutional occupancy
- commercial occupancy
16: Viscosity is
- a measure of heat content
- measure of weight
- the ability of oil to flow
- the coefficient of external friction
17: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
18: 746 watts is equal to
- Pi
- 1 hp
- 100 hp
- 10 hp
19: Heat is a form of
- energy
- work
- matter
- power
20: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
21: The evaporator is a device to
- store liquid refrigerant
- Keep the compressor busy
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
22: 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
23: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
24: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- non-positive displacement compressor
- negative displacement compressor
- non-volumetric displacement compressor
- neutral chamber-type compressor
25: Stop valves shall not be permitted between the system and the
- condenser
- relief valve
- bleed valve
- service valve