regulating the ratio between torque and speed via the torque limiter at the motor
directing the motor output flow through a bypass line
maintaining a constant flow and pressure input
controlling the input flow rate
第1题：
Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by ______.
A.permanent loss of pump suction
B.worn shaft seals
C.high level in the oil sump
D.low motor RPM
第2题：
an electric motor
a diesel engine
a compressor
oil
第3题：
The delivery rate of an axial piston hydraulic pump is controlled by varying the position of the
A.tilting box
B.slide block
C.pintle
D.reaction ring
第4题：
a variable displacement axial piston pump
a constant displacement axial piston pump
a reciprocating piston pump
a centrifugal pump
第5题：
lobe type
screw type
axial piston type
volute type
第6题：
excessive drive motor speed
excessive pump discharge pressure
too low of a tilting box angle
insufficient drive motor speed
第7题：
Constant pressure system
Variable pressure system
Variable displacement system
Constant volume system
第8题：
The usual number of single-acting pistons used in a variable stroke axial-piston pump is
A.3 or 5
B.5 or 7
C.7 or 9
D.9 or 11
第9题：
pump bearings in poor condition
excessively worn actuator-piston packing
broken directional control valve centering springs
low hydraulic oil viscosity
第10题：
in the pert position
in the starboard position
in the neutral position
to be dismantled