更多"The effective stroke of a constant-"的相关试题:
[单项选择]The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）
A. fuel delivery pressure
B. pump plunger diameter
C. plunger control rack position
D. total pump stroke
[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]Symptoms of heat stroke are（）.
A. cold and moist skin，high body temperature
B. cold and dry skin，low body temperature
C. hot and moist skin，high body temperature
D. hot and dry skin，high body temperature
[单项选择]The boat command that means complete the stroke and level the oars horizontally with the blades trimmed fore and aft is（）.
A. Oars
B. Up oars
C. Way enough
D. Hold water
[单项选择]Each cylinder in a two stroke cycle engine experiences combustion（）.
A. once each crankshaft revolution
B. twice each crankshaft revolution
C. every other crankshaft revolution
D. every fourth stroke
[单项选择]According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）
A. 1/2
B. 1
C. 2
D. 3
[单项选择]According to the principle of four stroke diesel engine, what is the number of its efficient work stroke per revolution?（）
A. 1/2
B. 1
C. 2
D. 3
[单项选择]
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）
(1) scavenging air is cooling the exhaust gases
(2) exhaust cycle time is longer
A. (1) only
B. (2) only
C. both (1) and (2)
D. neither (1) nor (2)
[单项选择]In the suction stroke, the crankshaft is rotating clockwise and the piston is moving （） the cylinderThe inlet valve is （） and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.
A. up；opened
B. down；open
C. up；closed
D. down；closed
[单项选择]Two-stroke engine turbocharging is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
A. respectable
B. respectful
C. respective
D. respectively
[单项选择]The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the （）.
A. slide block
B. tilting box
C. pintle
D. reaction ring
[单项选择]Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.
A. improving cylinder scavenging
B. preheating the combustion chamber
C. reducing air charge density
D. preventing valve wear
[单项选择]What are the symptoms of sun stroke?（）
A. Temperature falls below normal，pulse is rapid and feeble，skin is cold and clammy
B. Temperature is high，pulse is strong and rapid，skin is hot and dry
C. Temperature is high，pulse is slow and feeble，skin is clammy
D. Temperature falls below normal，pulse is rapid，skin is clammy
[单项选择]For an ordinary modem marine four-stroke engine the inlet valves close （）.
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[单项选择]Today, crankshafts for large 2-stroke crosshead engines are of the （）type.
A. semi-built
B. built-up
C. solid forged
D. individual forged
[单项选择]For an ordinary four-stroke engine the inlet valves open （）
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[单项选择]For an ordinary four-stroke engine the exhaust valves open （）.
A. after TDC
B. before TDC
C. after BDC
D. before BDC
