Topics: All categories in the pool
1: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
2: The oil separator is always inserted in the system
- in a cool spot
- in the discharge line
- to prevent oil logging
- where it can be easily serviced
3: In an A/C unit, dirty filters will cause
- low suction pressure
- high suction pressur
- low oil pressure
- high discharge pressure
4: Ammonia is under what safety classification?
- B2
- A3
- B1
- B3
5: R-22 is considered a(n)
- HCFC
- HFC
- HCFCH
- CFC
6: Copper and its alloys shall not be used with ammonia
- True
- False
7: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- annually
- bi-annually
- quarterly
- regularly
8: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
9: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
10: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- black iron
- magnesium
11: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 80 ohms
- 27 ohms
- 104 ohms
- 71 ohms
12: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
13: Sublimation occurs when
- gas is formed directly from a solid
- ice melts and turns to water
- gas is formed from a liquid
- liquid is formed from a gas
14: The purpose of an accumulator is to
- store excess refrigerant from the reciver
- reduce friction loss to the flow of refrigerant
- assure no liquid returns to the compressor
- filter out impurities from the system
15: The two float-type metering devices are the
- liquid float and the low-side float
- liquid float and the vapor float
- vapor float and the low-side float.
- high-side float and the low-side float
16: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- A group sensing
- phosgene gas sening
- CO Sensing
17: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- red
- blue
- orange
- green
18: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- 24 volt secondary side of the Class 2 transformer to the thermostat
- load-side of the contactor in
- first disconnect in
- breaker panel in
19: The Department that certifies the transportation of refrigerant is the
- EPA
- EPO
- DOT
- RSES
20: Sensible heat is the heat added to a substance to
- change its state
- cause evaporation
- raise its temperature
- freeze it
21: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Kelvin
- 1 Therm
- 1 BTU
- The rate of conduction
22: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- insulated
- leak checked
23: Who approves containers for refrigerants?
- D.O.E
- D.O.D
- E.P.A
- D.O.T
24: The principle used in continuous type absorption systems is
- Boyle's Law
- Charles's Law
- Ohm's Law
- Dalton's Law
25: What must be done to refrigerant pipes before being buried?
- Encased
- Coated
- Leaked checked
- Certified