Auxiliary Machinery. Test 63

When starting an air compressor, why is it necessary for the unloader to be activated before the drain valves are closed?

If the electric motor on an oil purifier is overloaded or has tripped, the most likely reason is _____

that the rubber plate has hardened causing excessive supply of sealing water.
that there are defects in the driving system, clutch, gears or bearings.
that the discharge pressure on the light liquid outlet is set too high, or the oil temperature has dropped.
that the amount of sealing water is insufficient or the sealing water timer is wrongly adjustment.

What is the purpose of the stuffing box in this combined piston compressor assembly ?

Why are anodes fitted to the seawater side of heat exchangers?

In a provison room refrigeration system what would be the most likely cause of high compressor discharge pressure?

When starting a compressor, why is it necessary for the unloader to be activated before the drain valves are closed ?

What is the most common reason for malfunctioning of a pneumatic amplifier ?

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