Topics: All categories in the pool
1: RPM's of a centrifugal compressor are at approximately?
- 500
- 30,000
- 15,000
- 10,000
2: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
3: The measurement of heat in a particular substance is
- specific heat
- sensible heat
- enthalpy
- latent heat
4: Halogenated refrigerants cannot be used with what material?
- Aluminum
- Stainless steel
- Copper
- Magnesium alloy
5: Large mercantile occupancy is
- 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
- 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 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 1500 persons congregate on levels above or below street level to purchase personal merchandise
6: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
7: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- ammonia
- Lithium bromide
- HCFC-123
- CFC-11
8: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- design pressure
- low pressure
- critical pressure
9: Capacitors are rated in
- kelvins
- megaohms
- micro-farads
- volt - amperes
10: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure within the system
- pressure drop across the evaporator coil
- pressure within the evaporator
11: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Enthalpy
- Latent heat
- Specific heat
- Sensible heat
12: Secondary refrigerants are usually
- expensive
- water or brine
- Prestone anti-freeze
- alcohol
13: Where would the EPR valve be located on a multiple evaporator system?
- inlet of the low temperature evaporator.
- outlet of high temperature evaporator
- outlet of the liquid line
- outlet of low temperature evaporator
14: Which of the following is not an air velocity meter?
- Hydrometer
- Anemometer
- Anemotherm
- Velometer
15: A chiller entering and leaving temperature difference is?
- 50 degrees F
- 20 degrees F
- 10 degrees F
- 5 degrees F
16: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 110
- 1,000
- 330
- 6.6
17: When an inspection is needed, how often must it be done?
- every 24 months
- annually
- every 18 months
- every 36 months
18: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
19: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
20: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
21: 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 technician
- welder qualified
- licensed welder
- competent welder
22: What is an example of institutional occupancy?
- Dorms
- Hospital
- Football stadium
- Shopping mall
23: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Air and dirt
- Oil and water
- Water and soap
- Moisture and air
24: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
25: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the high side
- upper chamber of the low side
- lower chamber of the low side
- lower chamber of the high side