To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, () is fitted.
- Aa check valve
- Ba gate valve
- Ca pressure reducing valve
- Da quick closing valve
To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, () is fitted.
1、The purpose of a custom is to cut down
The purpose of a custom is to cut down imports in order to protect domestic industry and workers from foreign competition.AtaxBtollCfeeDtariff
2、The()enables water to be blow down or
The()enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.Amain stem stop valveBauxiliary steam stop valveCfeed check or control valveDblow down valve
3、() are used to limit the pressure in a
() are used to limit the pressure in any particular portion and mainly control the pressure after the valve.ARelief valvesBCheck valvesCSafety valvesDReducing valve
4、As to the bearing, of the following, w
As to the bearing, of the following, which statement is not true?()Aff overheat is found, the engine must be stopped for inspectionBMuch heat...
5、The newspaper will have to close down
The newspaper will have to close down if it cannot increase its __ considerabiA distributionB contributionC prescriptionD circulatiol
6、To maintain design discharge pressure
To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the ().Ashaft and impellerBmotor and pump shaftCcasing and impeller wearing ringsDlantern ring and impeller