16 Multiple Choice 2 points Compressor capacity control that involves making cylinders inactive by controlling the valves using solenoids is an example of O Cylinder unloading O Modular compression O Valve lifting O Speed variation 17 Multiple Choice 2 points What is used to cool water that is supplied to chilled water coils used in commercial systems? Water coolers OO Direct-expansion cooler Water chillers Evaporative coolers 18 Multiple Choice 2 points What is the purpose of an interlock in a control system? O To make certain that a major load does not attempt to operate without a necessary load operating To make certain that the condenser fan motor and water-cooled condenser are operating O To start the compressor and condenser fan motor at same time To make certain that the indoor blower is not operating without compressor operation 19 Multiple Choice 2 points Which of the following choices represents an advantage of using a compressor with part winding motor starting? O Smaller compressors can be used Part winding motors are quieter Higher starting torque OO Lower starting ampacity