Topics: All categories in the pool
1: How many gallons of water per pound of ammonia do you need?
- 5
- 20
- 15
- 1
2: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
3: RPM's of a centrifugal compressor are at approximately?
- 30,000
- 15,000
- 500
- 10,000
4: The freezing point of water at sea level is?
- 32C
- 0F
- 32F
- -10C
5: The leaving chilled water set point for comfort cooling is typically?
- 45
- 60
- 66
- 38
6: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusion plug
- relief plug
- rupture plug
- fusible plug
7: On a TXV, the purpose of an external equalizer is to?
- balance the evaporator load
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
8: What must be done to refrigerant pipes before being buried?
- Coated
- Certified
- Encased
- Leaked checked
9: Crankcase heaters are energized
- when the compressor is off
- to allow easy compressor start-up
- while the compressor is running
- to prevent compressor freeze-up
10: When using nitrogen for brazing, the pressure should be:
- Slightly below atmospheric
- 125 psig
- 50-100 psig
- Very low
11: A low oil switch is typically
- manual reset
- automatic reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
12: What is not a requirement of a class T machine room?
- self-closing doors
- automatic ventilation
- fire hose connection to the building fire protection system
- tight fitting doors
13: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- capacity control
- refrigerant control
14: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 10
- 15
- 24
15: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- .1
- 1.2
- 1.7
- .8
16: What is Trichlorotrifluoromethane?
- R-11
- R-13
- R-113
- R-12
17: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
18: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the warmest evaporator
- Suction line at the compressor
- Suction line of the coolest evaporator
- Suction line prior to the accumulator of the lowest temperature system
19: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device and a pressure relief valve installed
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
20: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
21: On a pumpdown system, the liquid-line solenoid is controlled by the
- low-ambient controller
- low pressure switch
- thermostat
- defrost timer
22: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
23: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 144 BTU
- 12,000 BTU
- 24,000 BTU
- 970 BTU
24: What happens after your initial inspection of a pressure vessel?
- Inspector leaves a metal tag with a certification listed on it
- 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.
25: Low ambient controls are used when
- economizers are used
- always
- when systems run all year round
- on air conditioning systems only