Topics: All categories in the pool
1: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- concentrated solution
- weak solution
- strong solution
- absorbed solution
2: Which is the lowest vacuum?
- 1,000 Microns
- 5 psig
- 10 psia
- 5" hg
3: A VRF system is a direct system
- true
- false
4: The most common type of motor starter is
- part winding starter
- across the line starter
- duel-winding starter
- delts-wye starter
5: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the high side
- the aggregate of the high side and low side
- 2.5 times the design pressure
6: What is the amp draw of a 40 VA transformer at 24 volts
- 1.6 amps
- 106 amps
- 1,000 amps
- 1K amps
7: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- Pumpdown procedures are not allowed with systems containing liquid recievers
- release the charge when the pressure exceeds 310 psig or higher
- receive the pumpdown charge
- hold up to 110% of the pumpdown charge
8: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- licensed welder
- competent welder
- welder qualified
- licensed technician
9: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
10: Which refrigerant class listed below is the most flammable?
- A-3
- B-2
- C-3
- A-1
11: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
12: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
13: What would be the classification for Stop & Shop grocery store?
- Large mercantile
- Industrial
- Place of assembly
- Instituional
14: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
15: The principle used in continuous type absorption systems is
- Ohm's Law
- Dalton's Law
- Boyle's Law
- Charles's Law
16: "P" represents ______ in the Watt's law formula
- voltage
- amperage
- reactance
- watts
17: A single pole-double throw switch used how many wires excluding the ground wire?
- four
- three
- five
- two
18: Large mercantile occupancy is
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
19: RPM's of a centrifugal compressor are at approximately?
- 15,000
- 500
- 30,000
- 10,000
20: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 1000F
- 600F
- 800F
- 700F
21: Capacity control on an absorption system is typically accomplished by varying the
- pressure setting on the system's rupture disc
- rate at which heat is supplied to the generator
- speed of the chilled water circulatory pump
- speed of the condenser water circulator pump
22: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 6.6 lbs
- 13.9 lbs
- 44 lbs
23: What instrument is used to measure very high resistance?
- voltmeter
- tape measure
- ammeter
- meg ohmmeter
24: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
25: Which is considered the more efficient condenser?
- spray cooled
- water cooled
- air cooled
- fan cooled