Topics: All categories in the pool
1: A class B2 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and highly flammable
2: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the outdoors
- the return air ducted system
- Machinery rooms need not be vented
3: Liquid level gauges must be provided with what?
- A relief valve
- A red line
- A low level mark
- Automatic shut-offs
4: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM, pipe size, and equivalent head.
- GPM and balanced head and friction head
- GPM and unbalanced head and friction head
- GPM and friction head
5: The color code of a tank of ammonia is
- silver
- white
- lavender
- light green
6: How are safety controls wired in a circuit?
- Either series or parallel
- Series
- Series/parallel
- Parallel
7: A micron is
- a larger unit of measurement than Hg
- one thousandths of a millimeter
- one millonths of a micrometer
- one millonths of a centimeter
8: A EPR valve is installed on what type of evaporators?
- shell and tube evaporators
- plate evaporators
- high-temperature evaporators
- low-temperature evaporators
9: Can you use Ammonia in industrial applications?
- No, never
- Yes, always
- When mixed with R-718
- Yes, Under certain condidtions
10: Fractionation occurs when
- when a fraction of refrigerant is added as the full charge
- the pressures increase as the heat load increases
- the pressures decreases as the heat load decreases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
11: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 2 months
- 1 week
- 14 days
- 30 days
12: What is the voltage of each leg of a 480 Volt three-phase motor?
- 120v
- 208v
- 277v
- 240v
13: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- OSHA approved
- Well-lit exit signs
- Locked doors
14: If an oil’s floc point is too high, which of the following could occur?
- low head pressure
- high suction pressure
- compressor burn out
- plugged expansion valve
15: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 50
- 75
- 20
- 15
16: NH3 is
- ammonia
- R-508A
- R-718
- lithium bromide
17: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device installed on the high side of the system
- does not require a pressure-limiting device
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
18: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
19: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 10 amps
- 24 amps
- 20 amps
- There isn't enough information to answer.
20: The External equalizer of a TXV compensates for
- pressure within the system
- pressure within the evaporator
- pressure drop across the evaporator coil
- pressure drop across the condenser coil
21: How many refrigerant classifications are there for toxicity?
- 5
- 3
- 2
- 1
22: 746 watts is equal to
- 10 hp
- 1 hp
- Pi
- 100 hp
23: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
24: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 12"
- 36"
- 18"
25: What is the refrigerant dichlorodifluoromethane?
- R-12
- R-22
- R-123
- R-134A