更多"In the variable delivery pump, movi"的相关试题:
[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]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]Which pump is the self-priming pump?（）
A. turbine
B. centrifugal
C. ejector
D. mixed flow
[填空题]城铁列车中VVVF（Variable Voltage Variable Frequency）电源，主要用于交流电动机调速。为保证电动机转速在较宽的范围内连续可调，要求逆变器输出（）和（）都有较宽的调节范围。为保证电动机气隙磁通恒定以防止铁心饱和，还必须使逆变器输出电压和频率（）变化。逆变器需要有（）的响应速度，以使电动机获得良好的调速性能。为了为了使电动机有较高的运行效率，并且在低速下也能稳定运行，应尽量减少逆变器输出的（）含量。
[单项选择]The （）pump is usually used as the bilge feed pump to an oily water separator.
A. turbine
B. screw
C. vane
D. ejector
[单项选择]A （） pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.
A. injector
B. positive displacement
C. centrifugal
D. centripetal
[单项选择]The control spindle operates the slipper ring or （） of the variable delivery pump, which controls the suction and discharge of the oil.
A. servo-motor
B. swash plate
C. plunger
D. cylinder
[单项选择]A mixed-flow pump is a （） pump classified by the working principle.
A. self priming
B. positive displacement
C. reciprocating
D. impeller
[填空题]数控机床的操作面板上"SPINDLE"表示（）。
[单项选择]A variable displacement system of hydraulic drives consists of （）.
A. a variable displacement axial piston pump
B. a constant displacement axial piston pump
C. a reciprocating piston pump
D. a centrifugal pump
[单项选择]Which variable factor affects the initial lashing requirements aboard Ro-Ro vessels? （）
A. Age of vehicle or cargo unit
B. Size and weight of vehicle/cargo unit
C. Reputation of shipper concerning condition of cargo
D. Air pressure in the vehicles tires
[名词解释]被控量 (controlled variable )
[单项选择]Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）
A. Impeller
B. Electric motor
C. Volute
D. Eye
[单项选择]Which pump installation would require an external source of sealing water?（）
A. Main circulator pump jacket water cooling
B. Salt water service pump
C. Auxiliary condensate pump
D. Bilge pump
[单项选择]Fuel pump index is （）.
A. the viscosity index
B. the fuel oil contents
C. the starting speed
D. the reading at the rack
[单项选择]Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.
A. one size smaller than the pump suction nozzle
B. the same size as the pump suction nozzle
C. one size larger than the pump suction nozzle
D. installed with a short radius elbow at the pump
[单项选择]Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.
A. one size larger than the pump discharge nozzle
B. the same size as the pump discharge nozzle
C. one size smaller than the pump discharge nozzle
D. installed with a short radius elbow at the pump
[单项选择]A centrifugal pump vibrates excessively during operationUpon disassembling the pump it is found that the impeller is out of balanceWithout an available spare, you should （）.
A. drill holes through the heavy side of the impeller until it balances
B. weld counterweights to the light side of the impeller
C. remove metal from the heavy side by machining in a lathe
D. acid wash and serape the heavy side until it balances
