Topics: All categories in the pool
1: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
2: A solder joint melts at temperatures of
- 400F to 800F
- 1,200F to 1,500F
- 600F to 900F
- less than 400F
3: A water regulating valve opens when
- when the power is on there is an overcharge of refrigerant
- when the power is on
- the head pressure rises
- the compressor is on
4: What type of material can't be used on the outlet of a relief valve?
- PVC
- Magnesium alloy
- Stainless steel
- Copper
5: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
6: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-11
- Flush with RX-11
- Flush with R-718
- Flush with ammonia
7: Where a refrigeration or air conditioning system is installed,
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
- A field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressuers
8: Refrigerants shall be classified by
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
- color codes
- toxicity and flammability
9: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 90%
- 100%
- 80%
- 75%
10: The main purpose of the accumulator is to
- provide space for the accumulation of oil and containminants
- provide space for vapor to accumulate
- store liquid refrigerant
- prevent liquid slugs at the compressor
11: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
12: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- not enough oil in the system
- oil in evaporator
- low head pressure
- moisture in the system
13: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 24
- 10
- 15
14: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
15: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 25
- 10
- III
16: In a horizontal shell & tube condenser, the ammonia is liquefied by
- passing thru the tubes from top to bottom
- water sprayed over condenser
- removing the latent heat of vaporization
- removing the latent heat of fusion
17: An air conditioning system rated for 36,000 BTU's is equivalent to
- three tons of cooling
- one ton of cooling
- two tons of cooling
- 12,000 tons of cooling
18: The proper location for an oil separator is between the
- receiver and metering device
- condenser and receiver
- compressor and condenser
- evaporator and compressor
19: 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.
20: Machinery rooms must be vented to ______?
- neutralizing tank
- outdoors
- unoccupied spaces
- basement
21: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
22: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- the same
- there is no Group B1 refrigerants
- lower
- higher
23: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- you can never change refrigerants
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
24: What is the leaving chilled water set point for water chiller systems?
- 38F
- 45F
- 55F
- 66F
25: All serviceable components of a refrigeration system shall be provided with
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- service manuals
- manufactures instructions on start-up procedures
- safe access