Topics: All categories in the pool
1: 1 HP = ____ Watts?
- 746
- 3.1416
- 11,239
- 3,412
2: A secondary coolant is defined as
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- a low temperature refrigerant used for cascading systems
- any refrigerant direcly in contact with the cooling space for process cooling
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
3: What measures gas pressure?
- Hygrometer
- Manometer
- Barometer
- Hydrometer
4: How many gallons of water do you need per pound of ammonia?
- 100
- 50
- 1
- 10
5: Ammonia systems use ____ pressure to adjust oil pressure
- air
- discharge
- liquid
- stream
6: Crankcase heaters are energized
- while the compressor is running
- to prevent compressor freeze-up
- to allow easy compressor start-up
- when the compressor is off
7: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Tight fitting doors
- Self-closing doors
- Automatic ventilation
8: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
9: The discharge relief valve is located (9.4.6)
- between the compressor and oil separator
- between the compressor and the stop valve
- on top of the condensor
- between the compressor and reciever
10: Halo-carbon refrigerants cannot be used with what material?
- Aluminum
- Stainless Steel
- Copper
- Magnesium alloy
11: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 24
- 48
- 36
- 18
12: Dew point is
- the temperature below which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
- the temperature of air of 50% RH
- the temperature above which water vapor in the air will start to condense
13: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-113
- R-11
- R-12
14: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
15: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- High suction pressure and high discharge pressure.
- Low suction pressure and low discharge pressure
- Low head pressure and high suction pressure
- High head pressure and low suction pressure
16: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- III
- 15
- 10
17: A movie theater would be considered a
- mixed occupancy
- institutional occupancy
- commercial occupancy
- public assembly occupancy
18: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
19: What would be the classification of a prison?
- Industrial
- Place of assembly
- Large mercantile
- Institutional
20: The evaporator is a device to
- remove heat from the refrigeration system
- store liquid refrigerant
- absorb heat into the refrigeration system
- Keep the compressor busy
21: 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
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection and a rupture disc
22: Where a refrigeration or air conditioning system is installed,
- The company who installed the system must notify the fire department in the jurisdiction where installed
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- the form or certificate shall be authorized by the Department of Public Safety
23: While water is evaporated in an evaporative condenser the impurities which were in the water are
- remain in the air
- washed out of the air by the spray pump
- blown to the atmosphere by the fan
- accumulate in the sump water
24: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
25: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 2.0
- 3.0
- 2.5