Unit 31-49 Short Answers |120 Questions| With Correct Answers.

why are multiple smaller compressors sometimes preferred over one large compressor? {Ans: If one of the cylinders of a large compressor fails, the entire system is brought off-line. If one compressor of many goes bad, the other compressors will still operate and handle the load}where is the thermostat's sensing bulb located on a window air conditioner? {Ans: in the return air stream}what will happen if a technician uses a sling psychrometer that has a perfectly dry wick on the wet-bulb thermometer? {Ans: both thermometers will read the dry bulb temperature}how are centrifugal compressors lubricated? {Ans: with a separate oil circulating system then isolated from the refrigerant system}which type of fan create more pressure from inlet to outlet and is more desirable for a commercial duct system? {Ans: forward curved centrifugal fan}how can the cost of heating a home in the winter be lowered, and still have comfortable conditions in the home? {Ans: raising the humidity level and lowering the thermostat setting}