Topics: All categories in the pool
1: What type of copper is not permitted on refrigeration systems?
- Type N
- Type K
- Type M
- Type L
2: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
3: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- high and low pressure controls
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
4: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Moisture and air
- Oil and water
- Air and dirt
- Water and soap
5: 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.
6: What refrigerant doesn't have to be classifted?
- R-718
- R-711
- R-717
- R-134a
7: Increasing superheat will do what to your system?
- Decrease liquid flow
- Increase gas flow
- Increase liquid flow
- Nothing
8: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and balanced head and friction head
- GPM and friction head
9: 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
10: Thermodynamics is the branch of science that deals with
- state of energy
- energy due to motion
- molecular therory
- heat energy
11: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Welded and seamed.
- Ducted and sealed
- Insulated and cross broke
12: How would you know if there was a loss of crankcase pressure?
- oil will thin out
- oil will foam
- oil will thicken
- oil level will rise
13: What is the voltage of each leg of a 480 Volt three-phase motor?
- 240v
- 208v
- 120v
- 277v
14: A declaration test is needed when the system contains more than
- 55 lbs
- 120 lbs
- 65 lbs
- 110 lbs
15: What is NOT a positive displacement compressor.
- Reciprocating
- Centrifugal
- Scroll
- Rotary
16: Halogen refrigerants are corrosive to which type of metal?
- black iron
- copper
- stainless steel
- magnesium
17: 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
18: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Tight fitting doors
- Self-closing doors
19: One ton of refrigeration is defined as ______ btu/minute.
- 720,000
- 12,000
- 60
- 200
20: What would be the classification of a prison?
- Large mercantile
- Institutional
- Industrial
- Place of assembly
21: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- T&P device
- Circuit Breaker
- Relief valve
22: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Fan-like action
- Nesting scrolls
- Rotating vanes
- Suction and discharge valves
23: What is the boiling point of refrigerant governed by?
- Compressor RPM's
- Evaporator temperature
- Condenser sub-cooling
- P&T relationship
24: When energized, a normally open relay will be
- open
- noisy
- closed
- depends on the type and class of the relay
25: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above