Topics: All categories in the pool
1: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
2: All electrical work done on refrigeration systems must comply with
- ASHREA-15 Section 9.2.1
- OSHA
- NEC and Massachusetts Modifications
- Department of Energy
3: It takes how many BTU/hr to melt one pound of ice at 32F
- 970
- 180
- 144
- 212
4: R-12 is
- dichlorodifluoromethane
- dichloromethane
- dichlorofluoromethane
- trichlorofluoromethane
5: A class B1 refrigerant is considered
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
6: What happens after your initial inspection of a pressure vessel?
- 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
- Notify the Fire Marshal that the system has been inspected and approved
7: A split-phase motor has a ______ winding and a ____ winding
- duel-run, duel-start
- run, common
- start, common
- run, start
8: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Enthalpy
- Sensible heat
- Latent heat
- Specific heat
9: The leaving chilled water set point for comfort cooling is typically?
- 66
- 45
- 60
- 38
10: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
11: Clearance volume
- varies depending on compressor speed
- affects compressor capacity
- is the same on all compressors
- has no effect on compressor capacity
12: 746 watts is equal to
- 1 hp
- 10 hp
- Pi
- 100 hp
13: Most CFC's are
- inert
- flammable
- inert but toxic
- toxic
14: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
15: The best way to detect ammonia in brine is
- CO2 gas
- potassium of line
- nessler regaent
- carbonation of soda
16: What type refrigerant is NOT ozone depleting?
- HCFC
- CFC
- HFC
- Halon
17: 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 comrpessor
- reset the expansion valve
- reset the safety valve
- start the fan and circulating pump
18: When must refrigeration system covered by the code be inspected?
- Annually
- Annually and when installed
- Not required
- Upon installation
19: What is used to check very low air pressures in air conditioning duct?
- Manometer
- Vacuum gauge
- Anemomter
- Barometer
20: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Have it inspected
- Add refrigerant
- Document the superheat and subcooling reading
21: Name a reason that does not cause reduced condenser air quantity
- Dirty fan blades
- High ambient temperature
- Prevailing winds
- Dirty Coil
22: Which of the following is not an air velocity meter?
- Velometer
- Anemotherm
- Anemometer
- Hydrometer
23: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
24: The low pressure oil safety switch
- never trips
- must be reset manually
- resets itself after the time delay has terminated
- resets itself automatically
25: "I" represents ____ in the Ohm's law formula.
- voltage.
- amperage
- capacitance
- resistance