Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.

相似题目

• A leaking diesel engine fuel injector will cause（）

  A . prolonged maintenance intervals B . improved atomization C . greater fuel economy D . incomplete combustio

  查看最佳答案

• The sequence of parts in a generally used fuel oil supply system for a main engine is （） (1)tanks in the double bottom (2)centrifuges (3)service tank (4)settling tank (5)viscosity regulator

  A . (1)-(2)-(4)-(3)-(5) B . (1)-(4)-(2)-(3)-(5) C . (1)-(3)-(2)-(4)-(5) D . (1)-(5)-(4)-(2)-(3)

  查看最佳答案

• Fuel injector的中文意思是（）。

  查看最佳答案

• Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）

  A . grinding the spare plunger to the barrel B . replacing the plunger and the barrel C . highly polishing both the plunger and barrel D . replacing plunger only

  查看最佳答案

• The amount of fuel delivered by a unit injector is controlled by the （）

  A . camshaft B . main spring C . rack position D . nozzle orifice size

  查看最佳答案

• Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of（）.

  A . fuel/water separators B . day tanks C . injector test stand D . fuel filter

  查看最佳答案

• When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）

  A . quantity of fuel injected is decreased B . quantity of fuel injected will always be increased C . start of injection is advanced D . duration of injection will always be greater

  查看最佳答案

• The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.

  A . will lift B . will be lifted C . will close D . will be closed

  查看最佳答案

• When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）

  A . maintain higher than normal jacket water temperature B . change the lube oil more frequently than normal C . maintain a higher air-box temperature than normal D . maintain a higher air-box pressure than normal

  查看最佳答案

• A distorted spray pattern from a fuel injector can cause a diesel engine to have （）

  A . higher firing pressure B . more power output C . lower fuel pressure D . less power output

  查看最佳答案

• Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）

  A . changes the position of the fuel inlet ports B . changes the length of the pump stroke C . varies the quantity of fuel delivered D . varies the compression of the delivery valve spring

  查看最佳答案

• Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.

  A . heat conduction into the injected fuel oil B . heat conduction into the water jacket wall C . water circulation through passages in the holder D . fuel oil circulation through passages in the holder

  查看最佳答案

• Fix the fuel injector into （） after repair.

  A . the cylinder liner B . the cylinder cover C . the cylinder jacket D . the pisto

  查看最佳答案

• The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.

  A . be increased B . be decreased C . remain constant D . either be increased or remain constant

  查看最佳答案

• Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

  A . double bottom fuel oil tank temperature B . heater supply steam flow C . pressure of the fuel supplied to the burners D . attemperator steam flow in the heater discharge circuit

  查看最佳答案

• Injectors for use with heavy fuel oil must be cooled by either water or light oil to （）

  A . prevent heat corrosion to internal components B . increase fuel delivery rate and economy C . prevent pre-ignition D . avoid carbonization of the nozzle ti

  查看最佳答案

• Differential needle valves used in fuel injectors are directly closed by（）

  A . cam action B . spring force C . fuel oil pressure D . firing pressure

  查看最佳答案

• The fuel injector injects a fine spray of fuel into the hot air and combustion （）, producing much high pressure in the gases.

  A . has begun B . takes place C . occurs D . happe

  查看最佳答案

• The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.

  A . crankshaft B . camshaft C . piston rod D . rack and pinio

  查看最佳答案

• The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）

  A . the firing pressure in the cylinder B . a metering helix inside the pump C . varying the physical length of the plunger stroke D . varying the clearance between the injector cam and the injector rocker arm

  查看最佳答案

• The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.

  A . assist in a quick cutoff of fuel injection B . allow oil backflow from the injector to the helix C . reduce fuel oil pressure between injection strokes D . meter the quantity of fuel delivered

  查看最佳答案

• The fuel injector pump is operated by （） which drives the plunger up and down.

  A . a separate motor B . a cam C . a generator D . a chai

  查看最佳答案

• When the heavy fuel oil is heated to achieve the viscosity of 10-15 cSt, may occurTo avoid this, a system is used in most occasions.

  A.boiling and cavitations; low temperature B.boiling and cavitations; pressurized C.leaking and boiling; low temperature D.leaking and boiling; pressurized

  查看最佳答案

• ______most common kind of fuel used by______peasants in our district is wood.

  A．a/...the...the B．/...the.../ C．The.../...the D．The...the.../

  查看最佳答案