Topics: All categories in the pool
1: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
2: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 330
- 6.6
- 110
3: "I" represents ____ in the Ohm's law formula.
- amperage
- voltage.
- resistance
- capacitance
4: How many closing forces operate a thermostatic expansion valve?
- 3
- 2
- 1
- 4
5: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices or fusible plugs
6: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 25
- 10
- 20
- 15
7: In a system designed for sub-zero ambient temperatures, what must be added?
- Infrared dye for leak identification
- Booster compressor
- Nitrogen
- Low-ambient kit
8: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- reduce friction loss to the flow of refrigerant
- store excess refrigerant from the reciver
- filter out impurities from the system
9: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
10: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
11: On a single phase motor, when does the start winding cut out?
- 50% of its RLA speed
- 100% of its RLA speed
- 25% of its RLA speed
- 75% of its RLA speed
12: What type refrigerant is NOT ozone depleting?
- CFC
- HFC
- HCFC
- Halon
13: What section of ASHRAE-15 governs pressure vessels?
- Section 7 ASHRAE-15 ASME VIII fired
- Section 9 ASHRAE-15 ASME VIII unfired
- OSHA
- Section 6 ASHRAE-34 ASME VIII unfired
14: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 15 cubic feet or more
- 3 cubic feet or less
- 3 cubic feet or more
15: A single pole-double throw switch uses how many wires?(excluding the ground)
- 4
- 2
- 5
- 3
16: What kind of material can't be used on the outlet of a relief valve?
- Copper
- Stainless Steel
- PVC
- Aluminum
17: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three run windings and 3 start windings
- three start windings
- three run windings
18: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- R-414B
- Simple
- Low pressure
19: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
20: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- king valves
- gate or globe valves
- ball valves
21: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-134A
- R-22
- R-11
22: Control systems can be classified by
- economy of operation
- tonnage of system
- safety
- source of power
23: Two systems using separate refrigerants that are superimposed upon one another is called
- indirect
- cascade
- single stage
- booster
24: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 20 amps
- 5 amps
- 10 amps
- 15 amps
25: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above