更多"(Piston area)X(Piston stroke)K(numb"的相关试题:
[单项选择]During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?（）
A. Intake stroke
B. Compression stroke
C. Exhaust stroke
D. Pumping stroke
[单项选择]In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.
A. by an fuel valve
B. through an inlet valve
C. with an exhaust valve
D. from an outlet valve
[单项选择]An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.
A. cause loss of hydraulic oil from the system
B. result in extreme damage to the pump
C. cause damage to the pump ff not continually drained from the pump casing
D. result in the system high side pressure to substantially drop off
[单项选择]A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.
A. crankshaft revolution
B. mechanical cycle of operation
C. period of two combustion cycles
D. cycle of two events
[单项选择]The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.
A. shut
B. closing
C. opened
D. closed
[单项选择]During the suction stroke, the piston is moving （）.
A. inwards
B. outwards
C. downwards
D. upwards
[单项选择]The four-stroke cycle begins with the piston （）.
A. coming up from the BDC
B. coming up from the TDC
C. coming down from the BDC
D. coming down from the TDC
[单项选择]On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers power to the crankshaft through the （）.
A. thrust block
B. sounding rod
C. connecting rod
D. push rod
[单项选择]The purpose of compressing the air within the cylinder of a diesel engine is to （）
A. produce the heat for ignition
B. decrease injection lag
C. increase ignition delay
D. aid in exhausting burnt gases
[单项选择]The lube oil to lubricate the surfaces of the cylinder liners is spread over by the （）.
A. sliding piston rings
B. engines camshaft
C. small pumps
D. forced feed system
[单项选择]The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.
A. dividing walls
B. divided walls
C. dividing liners
D. divided jackets
[单项选择]The rate of fuel injection in a diesel engine cylinder depends primarily on （）.
A. the size of the holes in the fuel nozzle
B. timing of the pump
C. supply pressure to the pump
D. shape of the combustion chamber
[单项选择]The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the （）.
A. control rack
B. delivery valve
C. governor speed
D. plunger crossbar
[单项选择]During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）
A. piston skirt
B. pinion
C. crosshead
D. compression rings
[单项选择]Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）
A. less even torque
B. higher cylinder head temperatures
C. fewer power strokes per revolution
D. greater weight/size requirements
[单项选择]Abnormal crankpin bearing and piston skirt surface wear indicate（）
A. a restricted air intake
B. a clogged connecting rod oil passage
C. incorrect connecting rod alignment
D. high cylinder firing temperatures
[单项选择]Piston cooling fins are located（）
A. atop the piston crown
B. beneath the piston crown
C. at the base of the piston skirt
D. inside the cylinder liner cooling water jacket
[单项选择]Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）
A. jam in the most worn part of the cylinder when the rings expand
B. break in the most worn part of the cylinder when the rings expand
C. wear eccentrically on the side opposite the end gap
D. overheat and jam at the top center on the combustion stroke
