Topics: All categories in the pool
1: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Add refrigerant
- Have it inspected
2: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
3: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
4: 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
- The Li-Br solution will become more concentrated
- System operating pressure will drop
- Rust can form
5: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
6: A class A3 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
7: Pressure relief valves shall be marked with the data from
- Section VIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
- Section XIII Division of the ASME Boiler & Pressure Code
8: Which creates more of a heat load?
- 70% RH
- 90% RH
- 30% RH
- 50% RH
9: Class 3 refrigerants are
- non-toxic
- highly flammable
- non-flammable
- toxic
10: "I" represents _______ in the Watt's law formula.
- watts
- reactance
- amperage
- voltage
11: A movie theater would be considered a
- public assembly occupancy
- commercial occupancy
- institutional occupancy
- mixed occupancy
12: Refrigerant restricted in 2004 but used for transition for decades:
- R-22
- R-11
- R-134A
- R-123
13: What is the refrigerant chlorodifluoromethane?
- R-12
- R-22
- R-134a
- R-123
14: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- decreases
- increases
- doesn't change
- run as designed with low ambient controls
15: A water regulating valve opens when
- the head pressure rises
- the compressor is on
- when the power is on there is an overcharge of refrigerant
- when the power is on
16: A capacitor in series with the start windings will do what?
- Increase starting torque
- Decrease the RLA to within 10% of its rating
- Nothing
- Increase run efficiency by 10% of its rating
17: The solution that leaves the concentrator in an absorption chiller is referred to as the
- strong solution
- diluted solution
- absorbed solution
- weak solution
18: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 240 volts
- 2,400 volts
- 2.40 volts
- 24.0 volts
19: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- start the fan and circulating pump
- reset the expansion valve
- reset the safety valve
- start the comrpessor
20: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 600 watts
- 1000 watts
- 5KW
- 746 watts
21: Ammonia can come in contact with _______ ?
- Copper
- Aluminum
- Brass
- Copper tubing
22: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
23: Which of the following is not an air velocity meter?
- Velometer
- Anemometer
- Hydrometer
- Anemotherm
24: Pressure is the equivalent of
- area times force
- force per unit area
- force
- force times area
25: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False