更多"As the plunger moves upwards in the"的相关试题:
[单项选择]If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）
A. only the replacement of the entire pump would be acceptable
B. the injection pump and injection nozzle must be replaced
C. either the barrel or plunger must be replaced
D. the barrel and plunger must be replaced as a unit
[单项选择]As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.
A. being compressed
B. to be pumped up
C. is pressurized
D. are built up
[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]With Variable Injection Timing the start of injection may be （）as the engine load is reduced.
A. advanced
B. retarded
C. kept constant
D. none of the above
[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]The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.
A. barrel
B. ram
C. piston
D. rod
[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]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
[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]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]The distance a vessel moves parallel to the original course from the point where the rudder is put over to any point on the turning circle is called the（）.
A. advance
B. drift angle
C. pivoting point
D. transfer
[单项选择]Sometimes a tropical storm moves so slowly that a vessel，if astern of it，can（）it.
A. cross
B. approach
C. proceed near
D. run into
[单项选择]The distance a vessel moves at right angles to the original course，when a turn of 180°has been completed，is called the（）.
A. advance
B. pivoting point
C. tactical diameter
D. kick
[单项选择]While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
A. crankcase
B. slipper
C. cam housing
D. crankshaft
[单项选择]The distance that a ship moves forward with each revolutionof its propeller，if there is no slip，is called（）.
A. advance
B. head reach
C. pitch
D. transfer
[单项选择]The place where a channel moves from along one bank of the river over to the other bank of the river is called a（）.
A. draft
B. cutoff
C. draw
D. crossing
[单项选择]When a tornado moves over the water from land it is called a（）.
A. Tornado
B. Waterspout
C. Hurricane
D. Cyclone
[单项选择]The piston moves up and down, thus causing the rotational movement of the（）
A. crankshaft
B. connecting rod
C. cross-head
D. main beating
[单项选择]As a ship moves through the water，it drags with it a body of water called the wake. The ratio of the wake speed to the ship’s speed is called（）.
A. propeller velocity
B. speed of advance
C. wake distribution
D. wake fraction
