Topics: All categories in the pool
1: 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.
2: R-22 falls under which safety classification?
- B-1
- B-2
- A-2
- A-1
3: Large mercantile occupancy is
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
4: A chiller entering and leaving temperature difference is?
- 50 degrees F
- 20 degrees F
- 5 degrees F
- 10 degrees F
5: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- The Li-Br solution will become more diluted
- System operating pressure will drop
- The Li-Br solution will become more concentrated
- Rust can form
6: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
7: A pressure relief should be located at least _______ from windows and doors.
- 30'
- 20'
- 15'
- 25'
8: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
9: What is an example of institutional occupancy?
- Hospital
- Dorms
- Football stadium
- Shopping mall
10: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and friction head
- GPM and unbalanced head and friction head
- GPM, pipe size, and equivalent head.
11: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three start windings
- three run windings and 3 start windings
- three run windings
12: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
13: 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
- Water and soap
- Oil and water
- Air and dirt
14: The freezing point of water at sea level is?
- -10C
- 0F
- 32F
- 32C
15: Which of the following controllers would you expect to be most sensitive to temperature changes?
- low voltage t-stat
- immersion controller
- line voltage t-stat
- aquastat
16: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 30'
- At least 20'
- At least 40'
17: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-2
- B-1
- A-1
18: When an inspection is needed, how often must it be done?
- every 18 months
- every 36 months
- annually
- every 24 months
19: Increasing superheat will do what to your system?
- Decrease liquid flow
- Nothing
- Increase gas flow
- Increase liquid flow
20: Color is important in oil because
- it indicates the viscoisty.
- it makes sight glasses easy to read
- can tell us something about the refining of oil
- allows you to see into crankcase
21: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- printed circuit board (PCB)
- duel-voltage switch
- motor starter
- centrifugal switch
22: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
23: An electronic bridge circuit is basically a
- 24 volt control circuit
- Wheatstone
- suspension
- high voltage circuit
24: How are a compressor and condenser fan wired?
- series
- parallel
- series-parallel
- parallel-series
25: Low pressure chiller systems use what type of compressor?
- Reciprocating
- Centrifugal
- Screw
- Scroll