Pneumatic system is running but all of sudden system top and no air if coming out of compressor what is the cause? 1. Unloading valve fail 2. Low voltage 3. low current 4. Air leak in system 119. What is the primary function of the agitator in the process? 1. Does not allow solid to settle 2. For mixing the liquid 3. Heat Transfer 4. Promote Chemical Reactions 120. What kind of the valve is to be put at point "E" if pressure is drops? 1. A 2. B 3. C 4. D 121. W