Topics: All categories in the pool
1: At higher altitudes, boiling temperatures
- are unaffected
- increase
- depends on the refrigerant
- decrease
2: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and friction head
- GPM and unbalanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and balanced head and friction head
3: The reversing valve is commonly used
- when the code requires a check valve
- on all heat pumps
- on commercial system that involve two different temperatures
- on multiple compressor systems
4: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 55F
- 58F
- 32F
- 45F
5: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
6: What is the minimum height refrigeration piping should be placed against walls?
- Ceiling height
- 72"
- 7.25'
- 6'
7: Lithium-bromide, Li-Br, is best characterized as a
- sugar
- soil
- salt
- sand
8: Increasing superheat will do what to your system?
- Increase gas flow
- Nothing
- Increase liquid flow
- Decrease liquid flow
9: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
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: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Stainless steel
- Aluminum
- Copper
12: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 2
- 1
- 3
13: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
14: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Sensible heat
- Specific heat
- Enthalpy
- Latent heat
15: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- B-2
- A-1
- A-2
16: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
17: How are refrigerant blends classified?
- Based on worst case fractionation
- Based on best case Fractionation
- Blends don't have to be classified
- Based on the oil used
18: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
19: What pipe can not be used for refrigeration?
- L
- M
- N
- K
20: Megaohm meters can detect a ground in the
- 10,000,000 ohms or higher
- up to 1,000 ohms
- up to 10,000 ohms
- up to 1,000,000 ohms
21: Where would the EPR valve be located on a multiple evaporator system?
- outlet of low temperature evaporator
- outlet of high temperature evaporator
- inlet of the low temperature evaporator.
- outlet of the liquid line
22: 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
23: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
24: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Suction and discharge valves
- Rotating vanes
- Fan-like action
- Nesting scrolls
25: A thermometer placed in a supply air duct measures
- sensible heat
- latent heat
- air velocity x temperature squared.
- specific heat