更多"If the plunger or barrel of a fuel "的相关试题:
[单项选择]The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）
A. No fuel will be delivered
B. The maximum effective stroke will be attained
C. The fuel delivered to the cylinder will be excessive
D. The injection nozzle will overheat and carbonize
[单项选择]Fuel injection systems meter fuel, atomize fuel, and （）.
A. create turbulence in the combustion chamber
B. aid in completing cylinder scavenging
C. inject fuel at the proper time
D. minimize fuel penetration into the cylinder
[单项选择]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
A. ensure penetration and distribution of the fuel in the combustion chamber
B. ensure the needle valve is flushed clean during each injection
C. prevent combustion gas blowback into the open needle valve
D. prevent reflected pressure waves when the needle valve closes
[单项选择]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 pinion
[单项选择]As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.
A. opened up
B. closed off
C. lined up
D. taken off
[单项选择]The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.
A. pinion arrangement
B. push rod
C. handle bar
D. cam device
[单项选择]Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A. lower compression pressures
B. overheating without smoking
C. failure to start
D. a run away without load
[单项选择]The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）
A. varying the pump discharge pressure
B. varying the pump return pressure
C. rotation of the pump plunger
D. rotation of the pump barrel
[单项选择]A common trouble with the fuel pump plunger or fuel valve spindle is （）.
A. water leakage
B. steam leakage
C. oil leakage
D. air leakage
[单项选择]While overhauling a jerk-type fuel pump it is necessary to replace the pump plungerWhich of the parts listed below must also be replaced?（）
A. Delivery check valve
B. Pump barrel
C. Tubing to the injector
D. Cam follower
[单项选择]Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.
A. water in the fuel oil supply
B. excessive fuel nozzle holder cooling
C. a distorted fuel spray pattern
D. leakage past the plunger into the oil drain
[单项选择]The main source of fuel injection system malfunctions is （）
A. improper adjustments
B. contaminated fuel
C. coated fuel lines
D. excessive vibration
[单项选择]Problems with the diesel engine fuel injection pump are usually caused by（）
A. improper adjustment
B. contaminated fuel
C. kinked fuel lines
D. excessive engine vibration
[单项选择]Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）
A. employing fuel oil as a cooling medium
B. preventing hard carbon deposit on nozzle tips
C. avoiding fuel oil temperature exceeding builder’s specification
D. ensuring good metallic contact between nozzles and cylinder heads
[单项选择]The sequence of fuel injection into cylinders is determined by （）.
A. the steering
B. the driven gear
C. the turning gear
D. the timing gear
[单项选择]Fuel injection equipment must be kept in good condition, timed correctly, and the （）in each cylinder must also be carefully balanced so that individual cylinders are not overloaded.
A. MIP
B. MCR
C. MEP
D. BHP
