Topics: All categories in the pool
1: What is the leaving chilled water set point for water chiller systems?
- 38F
- 55F
- 66F
- 45F
2: What is used to check very low pressure?
- Hygrometer
- Hydrometer
- Manometer
- Velometer
3: The reversing valve is commonly used
- when the code requires a check valve
- on commercial system that involve two different temperatures
- on all heat pumps
- on multiple compressor systems
4: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 15
- 24
- 10
5: R-11 belongs to Group
- A-2
- B-1
- B-3
- A-1
6: 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
7: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- 1.2
- .1
- 1.7
- .8
8: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the coolest evaporator
- Suction line prior to the accumulator of the lowest temperature system
- Suction line at the compressor
- Suction line of the warmest evaporator
9: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 550
- 350
- 50
10: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- too small evaporator
- starved evaporator
- compressor suction valve stuck open
- overcharged
11: A motor starter contains a thermal overload and a
- solenoid
- contactor
- 3-way relay
- transformer
12: Which of the following controllers would you expect to be most sensitive to temperature changes?
- low voltage t-stat
- line voltage t-stat
- aquastat
- immersion controller
13: Clearance volume
- varies depending on compressor speed
- is the same on all compressors
- affects compressor capacity
- has no effect on compressor capacity
14: Which creates more of a heat load?
- 90% RH
- 30% RH
- 50% RH
- 70% RH
15: A water regulating valve opens when
- the head pressure rises
- when the power is on
- the compressor is on
- when the power is on there is an overcharge of refrigerant
16: What type of copper is not permitted on refrigeration systems?
- Type K
- Type M
- Type L
- Type N
17: How would you know if there was a loss of crankcase pressure?
- oil will foam
- oil level will rise
- oil will thicken
- oil will thin out
18: The best way to determine the voltage requirement for an electrical component is to
- read the nameplate data
- read the voltage with a mulitmeter
- determine the capacity of the service panel
- check with the utility company
19: How are refrigerant blends classified?
- Based on best case Fractionation
- Based on the oil used
- Blends don't have to be classified
- Based on worst case fractionation
20: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
21: An example of an "Expendable Refrigerant" is
- lithium bromide
- liquid oxygen
- liquid nitrogen
- ammonia
22: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
23: Capacity control on a centrifugal compressor is accomplished by the
- post-rotational guide vanes
- check valves
- slide vanes
- pre-rotational guide vanes
24: How many BTU's is produced by one watt of energy
- 2.57
- 3.00
- 3.41
- 1
25: What is R-22?
- HFC
- CCFCM
- Chlorofluoromethane
- Chlorodifluoromethane