Topics: All categories in the pool
1: 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
- welder qualified
- licensed welder
- licensed technician
- competent welder
2: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, paper method, and frost line.
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, pressure, and dipstick
- sight glass, weight, pressure, and frost line
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: Increasing superheat will do what to your system?
- Nothing
- Decrease liquid flow
- Increase liquid flow
- Increase gas flow
5: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 20 amps
- There isn't enough information to answer.
- 24 amps
- 10 amps
6: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
7: Which of the following controllers would you expect to be most sensitive to temperature changes?
- line voltage t-stat
- low voltage t-stat
- aquastat
- immersion controller
8: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
9: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 50
- 350
- 550
- 100
10: Class A refrigerants are considered
- toxic
- non-toxic
- non-flammable
- flammable
11: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
12: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
13: It takes how many BTU/hr to melt one pound of ice at 32F
- 212
- 970
- 144
- 180
14: NH3 is
- R-508A
- lithium bromide
- ammonia
- R-718
15: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Automatic ventilation
- Self-closing doors
- Fire hose connected to the building fire protection system.
16: The color code of a tank of ammonia is
- white
- light green
- silver
- lavender
17: What is a Category "M" fluid?
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump systems
18: 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
19: Class T machine room
- shall have remote controls to stop the action of the refrigerant compressor
- has no flame producing apparatus permanently installed
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
20: If two 500 ohm resistors are connected in series, the resistance will be
- 1000 ohms
- 500 ohms
- 20 ohms
- 200 ohms
21: On a TXV, the purpose of an external equalizer is to?
- balance the evaporator load
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
- compensate for a pressure drop across the evaporator coil
22: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- 1.2
- .8
- 1.7
- .1
23: How many square inches per square foot?
- 144
- 98
- 24
- 64
24: Ammonia can come in contact with _______ ?
- Brass
- Copper tubing
- Copper
- Aluminum
25: The Board of Boilers adopts by reference
- MSCA Code
- the MACS Pressure Vessel Code of Massachusetts
- Montreal Protocol Safety Code
- the 1997 ANSI/ASHRAE Safety Code