Topics: All categories in the pool
1: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- oil in evaporator
- not enough oil in the system
- moisture in the system
- low head pressure
2: What type of relief valve is used on a CO2 system?
- glove disc
- gate valve
- fusible plug
- rupture disc
3: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.25'
- 8'4"
- 7.00'
- 9.00'
4: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- of Group B2 refrigerant shall be prohibited
5: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- 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 occupied space
6: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- strong solution
- absorbed solution
- weak solution
- concentrated solution
7: What is the refrigerant dichlorodifluoromethane?
- R-22
- R-12
- R-123
- R-134A
8: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 40 uf
- 15 uf
- 20 uf
- 25 uf
9: Foaming of oil in a compressor is most likely to occur
- when there is insufficient air across the condenser(i.e., dirty coil)
- when the evaporator temperatures are below 32F
- when ambient temperature are low
- at start-up
10: A start capacitor is wired in _____ with the start windings.
- series-parallel
- series
- parallel
- junction
11: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 22
- 18
- 33
12: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection and a rupture disc
- over pressure protection as well as a temperature protection device
13: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the high side
- the aggregate of the high side and low side
- the low side
- 2.5 times the design pressure
14: The best way to detect ammonia in brine is
- CO2 gas
- carbonation of soda
- potassium of line
- nessler regaent
15: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- green
- orange
- blue
- red
16: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
17: When must refrigeration system covered by the code be inspected?
- Annually
- Upon installation
- Not required
- Annually and when installed
18: A pressure relief should be located at least _______ from windows and doors.
- 30'
- 20'
- 25'
- 15'
19: What is the leaving chilled water set point for water chiller systems?
- 38F
- 45F
- 55F
- 66F
20: Heat is a form of
- energy
- power
- matter
- work
21: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 55F
- 58F
- 32F
- 45F
22: On cooling towers, what causes the condenser water to drop
- evaporation of the water droplets
- ambient temperatures
- sensible heat
- tower fans
23: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
24: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
25: How are refrigerant blends classified?
- Based on the oil used
- Based on best case Fractionation
- Based on worst case fractionation
- Blends don't have to be classified