Topics: All categories in the pool
1: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Aluminum
- Copper
- Magnesium
2: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- thermostat
- low pressure switch
- low-ambient controller
3: When air is ducted through a machine room that services occupied space, What must be done?
- Welded and seamed.
- Insulated and cross broke
- Flanged and gasketed
- Ducted and sealed
4: Humidity can be sensed with
- bimetal
- thermometer
- human hair
- pressure bellows
5: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Football stadium
- Dorms
6: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
7: Horizontal piping should be run level.
- No, unless the supervisor on the job says so.
- Yes, if the condenser is located above the evaporator
- True
- False
8: What is the state of the refrigerant leaving the evaporator?
- a high temperature superheated vapor
- a high temperature subcooled liquid
- low temperature superheated vapor
- a low temperature subcooled liquid
9: Which refrigerant class listed below is the most flammable?
- C-3
- A-3
- B-2
- A-1
10: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 11F
- 9F
- 21F
- 29F
11: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
12: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
13: A restaurant is classified as a
- public assembly occupancy
- commercial occupancy
- large mercantile occupancy
- mixed occupancy
14: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices or fusible plugs
15: "I" represents _______ in the Watt's law formula.
- amperage
- reactance
- watts
- voltage
16: one BTU equals
- 12,000 hp
- 3.41 hp
- Pi
- 31.4 hp
17: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or more
18: Halogenated refrigerants cannot be used with what material?
- Copper
- Magnesium alloy
- Stainless steel
- Aluminum
19: A high side float is a
- 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
- float type valve that controls the crankcase oil level
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
20: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 25
- 10
- III
21: A hissing noise at the expansion valve is a good indication that
- liquid is passing thru it
- nothing is passing thru
- expansion valve is oversized
- gas is passing thru it
22: What device should be used on low-temperature freezers?
- high capacity TXV
- discharge muffler
- oil separator
- hot-gas by-pass
23: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
- over pressure protection
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
24: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 365 psig
- 327 psig
- 255 psig
- 125 psig
25: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the compressor
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- inside the room, immediately adjacent to each door