Topics: All categories in the pool
1: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 10 amps
- 15 amps
- 20 amps
- 5 amps
2: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 1 week
- 2 months
- 14 days
- 30 days
3: What are the three components of a transformer?
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and copper contacts
4: Low pressure systems have what kind of compressor?
- Scroll
- Centrifugal
- Rotary
- Reciprocating
5: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- run as designed with low ambient controls
- decreases
- doesn't change
- increases
6: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
7: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- strong solution
- absorbed solution
- concentrated solution
- weak solution
8: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
9: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- run voltage
- boost voltage
- lift voltage
- pick up voltage
10: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 226 psig, 68 psig
- 257 psig, 77 psig
- 455 psig, 185 psig.
- 365 psig, 120 psig
11: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UM
- UV or UR
- UM or UL
- UL and UR
12: A micron is
- one thousandths of a millimeter
- one millonths of a centimeter
- a larger unit of measurement than Hg
- one millonths of a micrometer
13: How are a compressor and condenser fan wired?
- parallel
- parallel-series
- series
- series-parallel
14: What must be done if refrigeration lines pass through a concrete floor?
- leak checked
- moisture barrier
- insulated
- installed through a pipe casing
15: 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
- evaporator
- outside the machinery room
- compressor
- boiler
16: One atmosphere equals
- 29.4
- 0 psia
- 0 psig
- 14.7
17: "E" references ____ in the Ohm's law formula
- amperage
- voltage
- resistance
- capacitance
18: Gauge pressure is
- what a gauge reads when checking pressures on a chilled water system.
- atmospheric pressure
- force of pressure above that of atmospheric
- absolute pressure
19: 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
20: How much clearance do you need around the perimeter of electrical panels?
- 36"
- 12"
- 18"
- 24"
21: How many volts would you read on a 480V system phase to phase?
- 0
- 1/3 the voltage
- 277
- 480
22: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices
23: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
24: What section of ASHRAE-15 governs pressure vessels?
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- OSHA
25: 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