Topics: All categories in the pool
1: Gauge pressure is
- absolute pressure
- force of pressure above that of atmospheric
- what a gauge reads when checking pressures on a chilled water system.
- atmospheric pressure
2: What is the intention of the word “should” as used in the code?
- A mandatory requirement
- A recommendation or advisory guideline
- A technician’s choice of how it should be done
- None of the Above
3: The purpose of an accumulator is to
- reduce friction loss to the flow of refrigerant
- store excess refrigerant from the reciver
- assure no liquid returns to the compressor
- filter out impurities from the system
4: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
5: The most common type of motor starter is
- duel-winding starter
- across the line starter
- delts-wye starter
- part winding starter
6: Before replacing a seized compressor, the _______ should be determinded.
- current draw
- cause of seizure
- type of refrigerant
- designed head pressure
7: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
8: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- cooling temperature set-point
- opening at the pump inlet
- adjustment of the spring tension of the adjustment of the spring tension of the pressure regulating valve
- opening at the pump outlet
9: How many CFMs are required per square foot of commercial office occupied space
- .5 CFM
- 5 CFM
- 15 CFM
- 20 CFM
10: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
11: Capacity control on an absorption system is typically accomplished by varying the
- speed of the condenser water circulator pump
- rate at which heat is supplied to the generator
- pressure setting on the system's rupture disc
- speed of the chilled water circulatory pump
12: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
13: 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
14: If you have a motor of 2 HP or less and under 300V, you can use a single pole switch (light switch) with what rating?
- 4x FLA
- 3x FLA
- 2x FLA
- 5x FLA
15: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 10
- 15
- 20
- 25
16: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 5KW
- 600 watts
- 746 watts
- 1000 watts
17: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
18: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
19: What is NOT a positive displacement compressor.
- Centrifugal
- Reciprocating
- Rotary
- Scroll
20: Who authorizes the form of certificate of completion of refrigeration systems that should be used?
- Massachusetts Board of Boiler Rules
- Fire Marshal
- Supervisor or project manager in charge of the installation
- Owner
21: What does ANSI stand for?
- American National Standards Institute
- American National Safety Institute
- When a technician becomes a bit “ansi” when having an issue troubleshooting a system
- None of the above
22: What would be the classification for Stop & Shop grocery store?
- Place of assembly
- Industrial
- Instituional
- Large mercantile
23: The actual expansion curve of compressor follows most nearly which one of the following
- Volume
- Pressure-Temperature
- Adiabatic
- Isothermal
24: The External equalizer of a TXV compensates for
- pressure within the system
- pressure drop across the condenser coil
- pressure drop across the evaporator coil
- pressure within the evaporator
25: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above