Basic Process Knowledge (Multiple Choice) 20180306
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Gear oil pumps are generally not suitable for operation in reverse because . A. Difficulties in motor commutation B. The direction of operation of the safety valve is already determined C. The oil trapping phenomenon will worsen D. The hydraulic radial forces will become unbalanced. Hint: Changing the wiring phase sequence of the motor will cause it to reverse direction ； Oil trapping has nothing to do with steering ； The radial force is unbalanced in both forward and reverse directions.
B. The operating direction of the safety valve has been determined
Why is it generally not advisable to run a gear oil pump in reverse? A. Difficulties in motor commutation B. The direction of operation of the safety valve is already determined C. The oil trapping phenomenon will worsen D. The hydraulic radial forces will become unbalanced. Hint: Changing the wiring phase sequence of the motor will cause it to reverse direction ； Oil trapping has nothing to do with steering ； The radial force is unbalanced in both forward and reverse directions. Choose B
B. The operating direction of the safety valve has been determined
B. The operating direction of the safety valve has been determined
B. The operating direction of the safety valve has been determined