The boiler feed water check valves are

1、Safety valves on a boiler vent to the

Safety valves on a boiler vent to the （）.Afuel tankBbilgeCatmosphereDauxiliary exhaust line

2、The heated feed-water entering any fla

The heated feed-water entering any flash chamber of a flash-type evaporator will（）Avaporize, with the un-flashed water remaining at the temperat...

3、The correct pH value of boiler water i

The correct pH value of boiler water is achieved by continuous addition of a suitable （） to the feed.AacidBalkaliCsaltDNone of the above

4、The feed water to the boiler will comp

The feed water to the boiler will comprise （）.AcondensateBa small amount of make-up feedCA and BDNone of the above

5、When a boiler is operating, the water

When a boiler is operating, the water level in the gauge glass reads （） when the boiler is shut down.Alower thanBhigher thanCas much asDthe same a

6、The boiler feed pump discharge pressur

The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.Aensure feed water flow into the boilerBkeep the steam drum pressure highCprevent water hammer in the feed lineDhelp the feed water flash to steam