Topics: All categories in the pool
1: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-113
- R-11
- R-12
- R-22
2: Refrigerants shall be classified by
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
- color codes
- toxicity and flammability
3: Ammonia (NH3) is a group III refrigerant
- True
- False
4: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 226 psig, 68 psig
- 257 psig, 77 psig
- 455 psig, 185 psig.
- 365 psig, 120 psig
5: The main purpose of the accumulator is to
- provide space for vapor to accumulate
- prevent liquid slugs at the compressor
- provide space for the accumulation of oil and containminants
- store liquid refrigerant
6: Capacitors are rated in
- kelvins
- volt - amperes
- micro-farads
- megaohms
7: A class B1 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
- toxic but non-flammable
8: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
9: Joints in refrigeration piping must be _____ before being covered?
- Pressurized
- Inspected
- Insulated
- Leak tested
10: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
11: What type of relief valve is used on a CO2 system?
- fusible plug
- gate valve
- rupture disc
- glove disc
12: Cooling tower lowers condenser water temp by
- running water thru a secondary heat exchanger
- running fans at 100%
- condensation
- evaporative cooling
13: What is NOT a positive displacement compressor.
- Rotary
- Reciprocating
- Scroll
- Centrifugal
14: The reversing valve is commonly used
- on commercial system that involve two different temperatures
- when the code requires a check valve
- on multiple compressor systems
- on all heat pumps
15: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- start the comrpessor
- start the fan and circulating pump
- reset the expansion valve
- reset the safety valve
16: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- too small evaporator
- starved evaporator
- compressor suction valve stuck open
- overcharged
17: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
18: Two systems using separate refrigerants that are superimposed upon one another is called
- booster
- cascade
- indirect
- single stage
19: A professional or office building would be considered what type of occupancy?
- business
- public assembly
- commercial
- mercantile
20: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- every 18 months
- annually
21: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
22: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Make sure its compatible, notify owner, and notify AHJ.
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
- you can never change refrigerants
23: All serviceable components of a refrigeration system shall be provided with
- service manuals
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- safe access
- manufactures instructions on start-up procedures
24: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
25: Which of the following is NOT a positive displacement compressor?
- reciprocating
- screw
- scroll
- centrifugal