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单选题
The amount of fluid delivered by a gear pump can be regulated by （）.
A
throttling the pressure line
B
changing the speed of the rotor
C
either A or B
D
None of the above is true
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单选题Which of the following statements about pump operations is NOT a correct statement?（）A
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单选题Which of the following statements is/are true regarding hydraulic pumps in general? （）A
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central valveB
radial plungerC
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单选题The pipe friction and the resistance will （） as a result of an increase in the amount of fluid flowing through the system.A
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throttling the pressure lineB
changing the speed of the pistonC
either A or BD
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单选题The amount of fluid delivered by a positive displacement pump can be regulated by （）.A
throttling the pressure lineB
changing the speed of the driving rotorC
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varying the pump discharge pressureB
varying the pump return pressureC
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单选题The pressure head of a pump is given in the unit of （）.A
kgB
MPaC
meter fluid columnD
None of the above is true
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