Excessive oil foaming in the crankcase

1、Foaming of the oil in a refrigeration

Foaming of the oil in a refrigeration compressor crankcase is caused by （）.Arefrigerant boiling out of solution from the lube oilBliquid refri...

2、Excessive alkalinity of the water in a

Excessive alkalinity of the water in an auxiliary boiler can cause （）.Acaustic embrittlement of the boiler metalBacidic corrosion of the boiler metalChard scale deposits on the boiler tubesDetching of the heat exchange surface

3、Sludge may form in the crankcase of an

Sludge may form in the crankcase of an air conditioning compressor as a result of （）.Abubbling refrigerantBoverheating and oxidationClowered operating temperaturesDreducing the cloud or flash point

4、In the common rail system, excessive p

In the common rail system, excessive pressure in the header may be caused by （）Aimproper adjustment of the bypass valveBa dribble in the fuel injection nozzleCinsufficient leak-off through injection nozzle packingDa malfunctioning injection nozzle

5、To prevent excessive （） in the transve

To prevent excessive （） in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible.Athermal stressesBbending momentsCthermal loadsDsurface tensio

6、If water is found in the crankcase of

If water is found in the crankcase of a diesel engine, the cause may be due to（）Aa cracked cylinder headBa leaky cylinder head gasketCa cracked cylinder linerDany of the above