Help with some test questions

I got a tip of some questions that will be on my journeyman exam tomorrow and there are some that I am not 100% on the correct answer. Wondering if you guys could offer any opinions? I've got arrows beside the answers I believe are correct

Describe the correct location of components for a unit designed to dehumidify:

​-heating coil upstream the cooling coil in the supply air duct, humidity sensor in the ​return air, supply air temperature sensor in the supply air ​-heating coil downstream the cooling coil in the supply air duct, humidity sensor in the ​return air, supply air temperature sensor in the supply air after the heating coil<<< ​-heating coil downstream the cooling coil in the supply air duct, humidity sensor in the ​supply air, supply air temperature sensor in the return air after the heating coil

When adding a microprocessor to a multiplex system what should you consider?

​-being able to see the screen ​-vibration ​-proximity to high voltage components<<<

What is the first thing to consider when installing a rooftop unit?

​-location of water lines and drainage ​-location of thermostat and power connections ​-angle of the roof and proximity to roof edge<<< ​-clearances for the unit and location of gas lines Where is the defrost termination sensor installed on a walk-in freezer with electric defrost?

​-in the supply air of the evaporator ​-in the return air of the evaporator ​-on the suction line ​-in the center of the return bends<<<

Describe the process of leak checking a sub-atmospheric (low pressure) chiller.

​-start chiller, use halide leak detector ​-start chiller, use electronic leak detector ​-stop chiller, raise pressure to 5 psi and use electronic leak detector<<< ​-stop chiller, raise pressure to 25 psi and use electronic leak detector

Thanks!

submitted by /u/tekknishun
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