When the relief valve opens it discharges high pressure refr

Springs in fuel injectors will become not strong enough to work because______.

A.the injector opens at a lower pressure than designed

B.the needle valve and seat wear out

C.the nozzle holes wear out

D.long time in use

A portable dry chemical fire extinguisher discharges by ______.

A.gravity when the extinguisher is turned upside down

B.pressure from a small CO2 cartridge on the extinguisher

C.air pressure from the hand pump attached to the extinguisher

D.pressure from the reaction when water is mixed with the chemical

Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?

A.Pressure-reducing valve

B.Unloading valve

C.Counterbalance valve

D.Pressure-relief valve

What type of valve is used to direct the flow of hydraulic fluid?

A.relief valve

B.direction control valve

C.stop valve

D.pressure control valve

If the head pressure of a reciprocating refrigeration compressor is excessive

A.the relief valve should open before the high pressure cutout

B.the relief valve should open and allow the excess refrigerant to flow to the receiver

C.the high pressure cutout switch should operate before the relief valve opens

D.you should close the discharging valve