Topics: All categories in the pool
1: What type of material can't be used on the outlet of a relief valve?
- PVC
- Magnesium alloy
- Stainless steel
- Copper
2: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
3: Halogenated refrigerants cannot be used with what material?
- Aluminum
- Magnesium alloy
- Stainless steel
- Copper
4: What does safe access mean?
- Well-lit exit signs
- A clear unobstructed path to the equipment and controls
- Locked doors
- OSHA approved
5: If the spring is adjusted to increase the superheat, this new setting will
- have no effect on the frost line
- allow more liquid into the evaporator
- shorten the frost line
- lengthen the frost line
6: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- Notify the AHJ to let them know that the system been inspected
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
7: Control systems can be classified by
- tonnage of system
- economy of operation
- source of power
- safety
8: How are a compressor and condenser fan wired?
- parallel
- series
- series-parallel
- parallel-series
9: Pi equals approximately
- 746
- 3.41
- 3.14
- 12,000
10: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
11: A 24 volt transformer with a 240 volt primary can handle how many amps?
- There isn't enough information to answer.
- 10 amps
- 24 amps
- 20 amps
12: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
13: All low-pressure chillers use which type of compressor?
- Scroll
- Centrifugal
- Rotary
- Reciprocating
14: How many gallons of water do you need per pound of ammonia?
- 100
- 10
- 50
- 1
15: "I" represents ____ in the Ohm's law formula.
- voltage.
- amperage
- capacitance
- resistance
16: Relief valves are rated in
- pounds of air per minute
- gallons of water per hour
- gallons of water per minute
- pounds of air per hour
17: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- high head pressure
- low suction pressure
- increased capacity
18: Joints in refrigeration piping must be _____ before being covered?
- Leak tested
- Insulated
- Pressurized
- Inspected
19: Name a reason that does not cause reduced condenser air quantity
- Dirty Coil
- High ambient temperature
- Dirty fan blades
- Prevailing winds
20: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 9 ASHRAE-15 ASME VIII unfired
21: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
22: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- institutional occupancy
- mixed occupancy
- public assembly occupancy
- commercial occupancy
23: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
24: The most common type of motor starter is
- duel-winding starter
- delts-wye starter
- part winding starter
- across the line starter
25: What is a high-side float?
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies