Topics: All categories in the pool
1: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- welder qualified
- licensed technician
- competent welder
- licensed welder
2: R-123 belongs to Group
- B-2
- B-1
- A-3
- B-3
3: R-11 has the greatest corrosive effect on
- Copper
- Aluminum
- Magnesium
- Bronze
4: The gauge thickness required on a CO2 tank construction is
- 3/32"
- 1/16"
- 1/8"
- 5/16"
5: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 240v
- 120v
- 208v
- 277v
6: At higher altitudes, boiling temperatures
- increase
- depends on the refrigerant
- decrease
- are unaffected
7: Which refrigerant class listed below is the most flammable?
- B-2
- A-1
- A-3
- C-3
8: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
9: Pipe identification labels are required when the system contains more than
- 55 lbs
- 110 lbs
- 120 lbs
- 65 lbs
10: What happens after your initial inspection of a pressure vessel?
- Inspector leaves a metal tag with a certification listed on it
- Notify the AHJ to let them know that the system been inspected
- 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.
11: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- high pressure
- critical pressure
12: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection and a rupture disc
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection as well as a temperature protection device
13: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
14: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 18
- 22
- 33
- 50
15: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- is a reciprocating type compressor with 2 or more pistons
16: Stop valves shall not be permitted between the system and the
- bleed valve
- relief valve
- condenser
- service valve
17: 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
18: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
19: Control systems can be classified by
- source of power
- economy of operation
- tonnage of system
- safety
20: one BTU equals
- Pi
- 12,000 hp
- 3.41 hp
- 31.4 hp
21: A start capacitor in series with a start winding will
- increase the amp draw of the motor
- increase running efficiency
- increase starting torque
- decrease the amp draw of the motor
22: The low pressure oil safety switch
- must be reset manually
- resets itself automatically
- resets itself after the time delay has terminated
- never trips
23: A secondary coolant is defined as
- a low temperature refrigerant used for cascading systems
- any refrigerant direcly in contact with the cooling space for process cooling
- 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
24: Ammonia vaporization takes place at what temperature?
- -32F
- -460F
- -110F
- -28F
25: What kind of material can't be used on the outlet of a relief valve?
- Stainless Steel
- Aluminum
- Copper
- PVC