Topics: All categories in the pool
1: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- ammonia
- HCFC-123
- Lithium bromide
- CFC-11
2: A split-phase motor has a ______ winding and a ____ winding
- duel-run, duel-start
- run, common
- start, common
- run, start
3: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 977.6 watts
- 9,776 watts
- .9776 watts
- 9.776 watts
4: Low pressure chiller systems use what type of compressor?
- Reciprocating
- Screw
- Scroll
- Centrifugal
5: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 104 ohms
- 71 ohms
- 27 ohms
- 80 ohms
6: Increasing superheat will do what to your frost line?
- Nothing
- Increasae
- Could either increase or decrease depending on the load conditions
- Decrease
7: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
8: Horizontal piping should be run level.
- Yes, if the condenser is located above the evaporator
- False
- True
- No, unless the supervisor on the job says so.
9: What kind of system uses two different refrigerants in separate systems dependent on each other?
- R-414B
- Cascade
- Low pressure
- Simple
10: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 22
- 25
- 66
11: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Sensible heat
- Latent heat
- Enthalpy
- Specific heat
12: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 24 amps
- 20 amps
- There isn't enough information to answer.
- 10 amps
13: The color code of a tank of ammonia is
- white
- silver
- light green
- lavender
14: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- blue
- orange
- green
- red
15: The principle used in continuous type absorption systems is
- Dalton's Law
- Ohm's Law
- Boyle's Law
- Charles's Law
16: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
17: The best way to determine the voltage requirement for an electrical component is to
- read the nameplate data
- determine the capacity of the service panel
- read the voltage with a mulitmeter
- check with the utility company
18: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
19: The generator shell contains the
- condenser and the generator
- condenser and the absorber
- evaporator and the absorber
- condenser, the evaporator, and the generator
20: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's water
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
- Because it's a non-flammable refrigerant
21: Class A refrigerants are considered
- toxic
- non-flammable
- non-toxic
- flammable
22: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
23: How many CFMs are required per square foot of commercial office occupied space
- 20 CFM
- 5 CFM
- 15 CFM
- .5 CFM
24: What is the state of the refrigerant leaving the evaporator?
- a high temperature subcooled liquid
- a low temperature subcooled liquid
- low temperature superheated vapor
- a high temperature superheated vapor
25: The best way to detect ammonia in brine is
- nessler regaent
- carbonation of soda
- potassium of line
- CO2 gas