Topics: All categories in the pool
1: How many opening forces operate a thermostatic expansion valve?
- 3
- 1
- 4
- 2
2: 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
3: On cooling towers, what causes the condenser water to drop
- tower fans
- ambient temperatures
- sensible heat
- evaporation of the water droplets
4: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
5: Heat transferred by conduction from one body to another is done
- via heat rays
- via liquids
- via radiation
- via solids
6: A positive displacement compressor is
- 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
- 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
7: Ammonia belongs to Group
- B-2
- A-1
- B-1
- A-2
8: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
9: The Department that certifies the transportation of refrigerant is the
- EPA
- EPO
- DOT
- RSES
10: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
11: Secondary refrigerants are usually
- Prestone anti-freeze
- alcohol
- expensive
- water or brine
12: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-11
- Flush with RX-11
- Flush with R-718
- Flush with ammonia
13: A rule of thumb in air conditioning is ____ CFM per ton?
- 400
- 600
- 100
- 500
14: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above
15: "P" represents ______ in the Watt's law formula
- voltage
- reactance
- amperage
- watts
16: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the warmest evaporator
- Suction line at the compressor
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the coolest evaporator
17: How would you know if there was a loss of crankcase pressure?
- oil will thin out
- oil will foam
- oil will thicken
- oil level will rise
18: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
19: How is bring measured?
- manometer
- anemometer
- hydrometer
- hygrometer
20: How many CFMs are required per square foot of commercial office occupied space
- 5 CFM
- 20 CFM
- .5 CFM
- 15 CFM
21: What is the refrigerant dichlorodifluoromethane?
- R-12
- R-22
- R-134A
- R-123
22: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 10 amps
- 20 amps
- 24 amps
- There isn't enough information to answer.
23: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Pressure induced displacement.
- Positive displacement
- Low Pressure displacement
- Non-positive displacement
24: Which of the following is not an air velocity meter?
- Anemotherm
- Anemometer
- Velometer
- Hydrometer
25: How are a compressor and condenser fan wired?
- series
- parallel
- parallel-series
- series-parallel