You are attempting to parallel two AC generators, and the synchroscope(同步器) pointer is revolving in the fast direction. This indicates that the frequency of the incoming machine is ______.
A. higher than the bus frequency
B. lower than the bus frequency
C. the same as the bus frequency but out of phase with it
D. the same as the bus frequency and the circuit breaker may be closed at any pointer position
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Pressure drop in an operating hydraulic system is developed ______.
A. only by the pump as its primary function
B. by resistance to the fluid flow through the system
C. by the thermal input to the system's fluid
D. solely(单独地) by the charge applied by the accumulators
Which of the listed problems could produce a high absolute pressure within a flash type evaporator？
A. production of high salinity distillate
B. seawater feed temperature below 165℃
C. a leak in the first stage demister
D. a cracked distillate pump vent line
Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy？
A. the hydraulic pumps
B. valves
C. hydraulic cylinders
D. hydraulic motors
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