Topics: All categories in the pool
1: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 60% Li-Br, 40% distilled water
- 50% Li-Br, 50% tap water
- 40% Li-Br, 60% distilled water
- 40% Li-Br, 60% tap water
2: 1 HP = ____ Watts?
- 3,412
- 11,239
- 3.1416
- 746
3: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 45F
- 158F
- 32F
- 155F
4: R-123 belongs to Group
- A-3
- B-2
- B-1
- B-3
5: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
6: Most CFC's are
- toxic
- flammable
- inert but toxic
- inert
7: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
8: 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
- 365 psig, 120 psig
- 455 psig, 185 psig.
9: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
10: Pipe identification labels are required when the system contains more than
- 65 lbs
- 120 lbs
- 55 lbs
- 110 lbs
11: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- Magnesium alloy
- Copper
- PVC
12: What is the voltage of each leg of a 480 Volt three-phase motor?
- 240v
- 277v
- 120v
- 208v
13: What type of copper is not permitted on refrigeration systems?
- Type K
- Type L
- Type N
- Type M
14: Halogen refrigerants are corrosive to which type of metal?
- copper
- stainless steel
- magnesium
- black iron
15: A hotel is considered a _______ occupancy.
- institutional
- commercial
- mercantile
- residential
16: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- there is no Group B1 refrigerants
- the same
- higher
- lower
17: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
18: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
19: 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
20: What is not a requirement of a class T machine room?
- automatic ventilation
- self-closing doors
- tight fitting doors
- fire hose connection to the building fire protection system
21: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
22: The purpose of an accumulator is to
- filter out impurities from the system
- store excess refrigerant from the reciver
- assure no liquid returns to the compressor
- reduce friction loss to the flow of refrigerant
23: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- no flames shall be permitted
- explosion precautions must be taken
- gas masks must be worn
24: Usually dry bulb temperature is
- higher than wet bulb temperature
- lower than dry bulb temperature
- not important and shall be ignored
- same as wet bulb temperature
25: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- low suction pressure
- high head pressure
- increased capacity