Topics: All categories in the pool
1: 1 Watt = ______ BTU's?
- 12
- 7.216
- 4.482
- 3.412
2: The low pressure oil safety switch
- never trips
- resets itself after the time delay has terminated
- resets itself automatically
- must be reset manually
3: What type of relief valve is used on a CO2 system?
- glove disc
- gate valve
- fusible plug
- rupture disc
4: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 10
- 25
- III
- 15
5: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- boiler
- compressor
- evaporator
- outside the machinery room
6: On a single phase motor, when does the start winding cut out?
- At 25% of its full rated speed
- Start windings do no cut-out of the run cycle
- At 75% of its full rated speed
- At 50% of its full rated speed
7: What device measures the specific gravity of a substance?
- Hygrometer
- Hydrometer
- Thermometer
- Manometer
8: Liquid line filter-driers on a 410A system must be rated for no less than
- 200 psig
- 1000 psig
- 600 psig
- 400 psig
9: 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
10: A hotel is considered a _______ occupancy.
- commercial
- mercantile
- institutional
- residential
11: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
12: "I" represents ____ in the Ohm's law formula.
- amperage
- capacitance
- voltage.
- resistance
13: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
14: An electronic bridge circuit is basically a
- high voltage circuit
- suspension
- 24 volt control circuit
- Wheatstone
15: The External equalizer of a TXV compensates for
- pressure within the evaporator
- pressure within the system
- pressure drop across the condenser coil
- pressure drop across the evaporator coil
16: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the liquid side of the system
- low side of the system
- the vapor side of the system
- high side of the system
17: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
18: 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
- competent welder
- welder qualified
- licensed welder
- licensed technician
19: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
20: Ammonia vaporization takes place at what temperature?
- -110F
- -460F
- -28F
- -32F
21: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
22: How many gallons of water per pound of ammonia do you need?
- 1
- 5
- 20
- 15
23: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
24: Humidity can be sensed with
- human hair
- thermometer
- pressure bellows
- bimetal
25: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 1 week
- 2 months
- 14 days