Topics: All categories in the pool
1: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs.
- 660 lbs
- 55 lbs
- 550 lbs
2: Total heat of a substance is considered
- enthalpy
- specific heat
- empathetical
- sensible heat
3: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
4: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- inlet of the low temperature evaporator.
- outlet of the liquid line
- outlet of low temperature evaporator
5: A low oil switch is typically
- manual reset
- automatic reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
6: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Zinc
- Nickel
- Magnesium
7: Sublimation occurs when
- ice melts and turns to water
- gas is formed from a liquid
- gas is formed directly from a solid
- liquid is formed from a gas
8: "I" represents _______ in the Watt's law formula.
- watts
- amperage
- voltage
- reactance
9: Brazed joints melt at temperatures above
- 1,200F
- 500F
- 800F
- 1,000F
10: The low pressure oil safety switch
- resets itself automatically
- must be reset manually
- never trips
- resets itself after the time delay has terminated
11: At higher altitudes, boiling temperatures
- depends on the refrigerant
- are unaffected
- decrease
- increase
12: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
13: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection and a rupture disc
- over pressure protection as well as a temperature protection device
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
14: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- ball valves
- gate or globe valves
- companion or block valves
- king valves
15: A high side float is a
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type valve that controls the crankcase oil level
- float type valve that controls the amount of refrigerant stored in the receiver
- float type switch that stops the compressor when the pressure on the high side becomes too high
16: R-11 belongs to Group
- A-2
- B-1
- B-3
- A-1
17: How many opening forces operate a thermostatic expansion valve?
- 2
- 4
- 3
- 1
18: How many groups of refrigerants are there?
- 1
- 7
- 3
- 5
19: Pressure relief valves shall be marked with the data from
- Section I Division VIII of ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section XIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
20: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.5
- 1.2
- 2.2
21: A motor starter contains a thermal overload and a
- transformer
- contactor
- solenoid
- 3-way relay
22: A rule of thumb in air conditioning is ____ CFM per ton?
- 500
- 600
- 100
- 400
23: 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
- 365 psig, 120 psig
- 257 psig, 77 psig
- 226 psig, 68 psig
- 455 psig, 185 psig.
24: 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
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