Topics: All categories in the pool
1: Adjusting the spring pressure on a TXV
- changes subcooling
- adjusts the bulb charge
- changes superheat
- makes no difference
2: What type of material can't be used on the outlet of a relief valve?
- Copper
- Magnesium alloy
- Stainless steel
- PVC
3: While water is evaporated in an evaporative condenser the impurities which were in the water are
- remain in the air
- blown to the atmosphere by the fan
- washed out of the air by the spray pump
- accumulate in the sump water
4: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
5: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 250
- 350
- 100
- 400
6: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
- the gas returns to a liquid
- the gas is no longer saturated
7: How many volts would you read on a 480V system phase to phase?
- 480
- 277
- 1/3 the voltage
8: Which oil is hydoscopic?
- animal
- SW30
- mineral
- polyolester
9: 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
10: R-22 is considered a(n)
- HFC
- HCFC
- HCFCH
- CFC
11: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
12: Name a reason that does not cause reduced condenser air quantity
- Prevailing winds
- High ambient temperature
- Dirty Coil
- Dirty fan blades
13: Heat is a form of
- work
- power
- matter
- energy
14: How many groups of refrigerants are there?
- 5
- 7
- 1
- 3
15: Which of the following is an example of an azeotropic refrigerant?
- R-404A
- R-500
- R-410A
- R-134A
16: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
17: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- reset the safety valve
- start the fan and circulating pump
- reset the expansion valve
- start the comrpessor
18: 746 watts is equal to
- 100 hp
- 10 hp
- Pi
- 1 hp
19: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 75%
- 80%
- 90%
20: A positive displacement compressor is
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
21: An accumulator can be located between the
- evaporator and compressor
- condenser and evaporator
- compressor and condenser
- first stage and second stage compressors
22: Which is considered the more efficient condenser?
- water cooled
- air cooled
- spray cooled
- fan cooled
23: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
24: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- commercial occupancy
- mixed occupancy
- institutional occupancy
25: Liquid level gauges must be provided with what?
- Automatic shut-offs
- A relief valve
- A low level mark
- A red line