Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）
1、A charge of fresh air is drawn into th
A charge of fresh air is drawn into the engine cylinder and then （） by the moving piston（） very high pressure.Apressed；toBpressurized；withCpushed；inDcompressed；to
2、The suction - force principle of opera
The suction - force principle of operation is a typical characteristic of （）.Acentrifugal pumpsBjet pumpsCpropeller pumpsDreciprocating pum
3、In the suction stroke air is induced i
In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.Aby an fuel valveBthrough an inlet valveCwith an exhaust valveDfrom an outlet valve
4、Air leakage between the shaft and stuf
Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by （）.Aa compressed packing glandBlantern tings between the packing ringsCa liquid sealDthe stuffing box gland
5、The emergency bilge suction or bilge （
The emergency bilge suction or bilge （） is used to prevent flooding of the ship.Ainjection valveBrelief valveCdischarge valveDinlet filter
6、Excessive oil foaming in the crankcase
Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.Aoverheated compressor bearingsBexcess lube oil viscosityCcarbon deposits on the compressor piston ringsDwax crystals forming in the lubricant