Topics: All categories in the pool
1: Suction line oil traps should be installed when the condenser is
- on the third floor roof and the evaporator is in the basement
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
- in the basement and the evaporator is on the third floor
2: A self contained system
- is a unit system Group I refrigerants only
- is any system or part of a system used to increase evaporation by expansion or vaporization
- is a complete factory made and tested system
- is a unit system Group II refrigerants only
3: The best way to detect ammonia in brine is
- nessler regaent
- CO2 gas
- carbonation of soda
- potassium of line
4: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
5: The reversing valve is commonly used
- when the code requires a check valve
- on multiple compressor systems
- on all heat pumps
- on commercial system that involve two different temperatures
6: If the power element on an expansion valve should lose its charge, the valve would
- Close
- Stay open
- Over feed
- Under feed
7: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the aggregate of the high side and low side
- 2.5 times the design pressure
- the high side
- the low side
8: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 1 week
- 30 days
- 2 months
- 14 days
9: A run capacitor is wired in series with the _____ windings.
- run
- start
- start capacitor
- common
10: A relief valve shall be located at least ___ above grade.
- 10'
- 15'
- 25'
- 36'
11: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
12: The freezing point of water at sea level is?
- 32F
- -10C
- 32C
- 0F
13: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
14: A high side float is a
- float type valve that controls the crankcase oil level
- float type switch that stops the compressor when the pressure on the high side becomes too high
- float type valve that controls the amount of refrigerant stored in the receiver
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
15: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 18
- 22
- 50
- 33
16: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
17: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EEV
- EPR valve
- CPR valve
- Solenoid valve
18: On a centrifugal compressor, stationary diffuser vanes are needed to
- stop gas flow
- prevent high pressure on the packing
- convert velocity energy to pressure
- increase the clearance space
19: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
20: Suction valve unloaders afford an effective means of
- refrigerant control
- capacity control
- evaporator control
- superheat control
21: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
22: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 24
- 18
- 36
- 48
23: The color code of a tank of ammonia is
- light green
- white
- silver
- lavender
24: The location of a thermal bulb of a TXV affects
- the amount of liquid in the condenser.
- the amount of liquid returning to the compressor
- the amount of liquid refrigerant in the evaporator
- subcooling
25: Copper and its alloys shall not be used with ammonia
- True
- False