更多"The delivery rate of a variable str"的相关试题:
[单项选择]When the tilting box of a variable stroke axial-piston pump is perpendicular to the pump shaft, which of the following conditions will exist?（）
A. The pistons reciprocate
B. The ‘B’ end cylinder barrel rotates
C. There is no fluid flow
D. Power is transmitted hydraulically
[单项选择]An axial轴向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned （）.
A. radially from the shaft
B. parallel to each other and to the shaft
C. parallel to each other but at a right angle to the shaft
D. at an angle to each other and to the shaft
[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]In the variable delivery pump, moving the spindle more from the central point will cause （） fluid to be pumped and consequently （）pressure is generated to drive the rams.
A. more；more
B. more；less
C. less；more
D. less；less
[单项选择]The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.
A. sliding block
B. pintle
C. reaction ring
D. tilting box or swash plate
[单项选择]Under rotary pumps are the gear, （）, cam-and-piston and screw types.
A. reciprocating
B. diffuser
C. turbine
D. vane
[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]In a fixed displacement axial piston hydraulic motor, the speed is varied by（）
A. regulating the ratio between torque and speed via the torque limiter at the motor
B. directing the motor output flow through a bypass line
C. maintaining a constant flow and pressure input
D. controlling the input flow rate
[单项选择]The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.
A. lathed
B. shaped
C. shrunk
D. developed
[单项选择]Attempts are made to eliminate axial thrust in centrifugal pump by （）.
A. providing the impeller with balancing holes
B. the use of symmetrical impeller
C. neither A nor B
D. either A or B
[单项选择]With reference to an axial piston pump, which one of the following statements is true?（）
A. The cylindrical barrel is coupled to the motor
B. The cylindrical barrel has an odd number of bores
C. The bores end in sockets
D. The sockets fit in the swash plate
[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]
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）
(1) MEP is lower and the scavenging air is cooling the exhaust gases
(2) valve overlap in a four-stroke
A. (1) only is correct
B. (2) only is correct
C. both (1) and (2) are correct
D. Neither (1) or (2) are correct
[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
