Topics: All categories in the pool
1: How many gallons of water per pound of ammonia do you need?
- 15
- 20
- 1
- 5
2: Cooling tower lowers condenser water temp by
- evaporative cooling
- running fans at 100%
- running water thru a secondary heat exchanger
- condensation
3: Where must a refrigeration contractor's license number be displayed?
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
4: 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
5: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
6: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
7: When using nitrogen for brazing, the pressure should be:
- Slightly below atmospheric
- Very low
- 50-100 psig
- 125 psig
8: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- non-volumetric displacement compressor
- negative displacement compressor
- non-positive displacement compressor
- neutral chamber-type compressor
9: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 330
- 200
- 100
10: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure within the system
- pressure within the evaporator
- pressure drop across the evaporator coil
11: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- no
- yes, for systems under 10 tons
- yes
12: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
13: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
14: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- motor starter
- printed circuit board (PCB)
- duel-voltage switch
- centrifugal switch
15: A high side float is a
- 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
- float type valve that controls the crankcase oil level
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
16: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- public assembly occupancy
- illegal occupancy
- institutional occupancy
- commercial occupancy
17: A tachometer is an instrument used to measure
- RPM
- static pressure
- air velocity
- speed
18: A split-phase motor has a ______ winding and a ____ winding
- duel-run, duel-start
- run, start
- run, common
- start, common
19: It takes how many BTU/hr to melt one pound of ice at 32F
- 144
- 970
- 212
- 180
20: "P" represents ______ in the Watt's law formula
- watts
- amperage
- voltage
- reactance
21: What is the minimum size wire you can use on a 30 amp circuit?
- 16 AWG
- 12 AWG
- 14 AWG
- 10 AWG
22: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
23: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
24: Class 3 refrigerants are
- highly flammable
- toxic
- non-flammable
- non-toxic
25: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space