单选题（） provides the head or pressure to supply the domestic water where required.AThe compressed airBThe compressing airCThe transfer pumpDThe head tank
单选题
（） provides the head or pressure to supply the domestic water where required.
A
The compressed air
B
The compressing air
C
The transfer pump
D
The head tank
参考解析
解析：
暂无解析
相关考题：
_____ is based on information gathered and analyzed about demand and supply. This forecast provides a prediction of short and long term prices and the underlying reasons for those trends.A Demand forecastB Price forecastC Supply forecastD Production forecastE None of the above.
184 _____ is based on information gathered and analyzed about demand and supply. This forecast provides a prediction of short and long term prices and the underlying reasons for those trends. A. Demand forecastB. Price forecastC. Supply forecastD. Production forecastE. None of the above
The new logistics strategy requires the support of the relevant ( ),for computer provides brand new manners to process the traditional task. A、firewallB、logistic softwareC、ERPD、supply-chain
If a refrigeration compressor is short cycling on high head pressure, you shouldA.purge the condenser if the waterside is dirtyB.check for proper water flow through the condenserC.increase the high pressure cutout settingD.reduce the cooling water flow
If the head pressure of a reciprocating refrigeration compressor is excessiveA.the relief valve should open before the high pressure cutoutB.the relief valve should open and allow the excess refrigerant to flow to the receiverC.the high pressure cutout switch should operate before the relief valve opensD.you should close the discharging valve
The pressure of a liquid leaving the pump can be referred to as the ______.A.total headB.discharge headC.net positive suction headD.suction head
In order to withstand fluid head pressure on a ship，stiffeners are often attached to the bulkhead ______.A.penetrationsB.platingC.framingD.brackets
What is the purpose of pressure-vacuum relief valves ________．A.Regulation of discharge pressure from cargo pumpsB.Maintaining constant velocity in cargo linesC.Regulation of suction head on cargo pumpsD.To maintain a tank or void at atmospheric pressure
单选题What is the purpose of pressure-vacuum relief valves? （）ARegulation of discharge pressure from cargo pumpsBMaintaining constant velocity in cargo linesCRegulation of suction head on cargo pumpsDTo maintain a tank or void at atmospheric pressure
单选题The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means （）.AstartersBpressure switchesCpressureDwater
单选题In a domestic fresh water system, the pump starters are controlled by （） switches which operate when the pressure in the tank varies within predetermined limits as water is drawn off.Awater levelBwater flowCtemperatureDpressure
单选题If a refrigeration compressor is short cycling on high head pressure, you should （）.Apurge the condenser if the waterside is dirtyBcheck for proper water flow through the condenserCincrease the high pressure cutout settingDreduce the cooling water flow
单选题A microbarograph is a precision instrument that provides a（）.Acharted record of atmospheric temperature over timeBcharted record of atmospheric pressure over timeCgraphic record of combustible gases measured in an atmosphereDgraphic record of vapor pressure from a flammable/combustible liquid
单选题Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level.Aa level controllerBa temperature switchCa pressure switchDa floating ball
单选题In general, domestic flesh water tank kept under pressure by an external supply of （）.Aforced circulating pumpBcompressed airCgravity tankDbead tank
单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.Athe relief valve should open before the high pressure cutoutBthe relief valve should open and allow the excess refrigerant to flow to the receiverCthe high pressure cutout switch should operate before the relief valve opensDyou should close in on the suction valve
单选题Which of the following terms is used to identify the pressure of the liquid entering a pump?（）ASuction headBPump headCDischarge headDTotal head
单选题If the head pressure is too high,（）Athe relief valve should open before the high-pressure cutoutBthe relief valve should open and let excess refrigerant go to receiverCthe high-pressure cutout switch should operate before the relief valve opensDclose in on the suction valve
单选题The static suction head of is the （）Adistance of the suction liquid level above the line of the pumpBdistance the suction liquid level is below the center line of the pumpCforce necessary to overcome frictional losses in the pump and pipingDamount in inches of mercury the total suction head is below atmospheric pressure
单选题Low compression pressure in a diesel engine may be the result of （）Ainsufficient fuel supply due to fuel pump valves sticking or leakingBexcessive mechanical clearance between the piston crown and cylinder headCexcessively worn fuel pump plungerDexcessive exhaust back pressure
单选题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 valveBa gate valveCa pressure reducing valveDa quick closing valve
单选题The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.Aan adequate supply of lube oilBan adequate supply of fuel oilCan adequate supply of turbine oilDan adequate supply of cylinder oil
单选题The pressure of a liquid leaving the pump can be referred to as the （）.Atotal headBdischarge headCnet positive suction headDsuction head
单选题The pressure head of a pump is given in the unit of （）.AkgBMPaCmeter fluid columnDNone of the above is true
单选题The single acting cylinder is the simplest form where pressure is applied to the full area of the piston head to move the load through piston rod extensionThe load causes rod （） when the drive pressure is released.AcontractionBretractionCexpansionDshrinkage
单选题The volute of centrifugal pump also acts as a diffuser converting （）into pressure head.Amechanical energyBheat energyCpotential energyDkinetic head