The load between two steam-driven alternators operating in parallel may be adjusted by varying （）
A、the speed of the alternators
B、the field strength of the machines
C、the power factor of the alternators
D、steam supply to the prime movers
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The thermal expansion valve responds to the（）
A、amount of superheat in the vapor leaving the coil
B、amount of superheat in the liquid
C、temperature in the evaporator coils
D、pressure in the evaporator coils
The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the （）.
A、bridge control panel
B、disconnect links
C、governor relay box
D、main switchboard
The SOLAS convention prescribes that the emergency steering drill should be carried out one time every （） months.
A、4
B、3
C、2
D、1
In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by（）
A、opening more bypass lines
B、opening additional expansion valves
C、adding refrigerant
D、speeding up the machine
Which of the following problems will occur if the internal drain at either end of a hydraulic, two-way, spool-type directional control valve cylinder were to become plugged?（）
A、The reservoir would become vapor bound
B、The valve would be placed in hydraulic lock
C、The spring loaded relief ports would open
D、The buffering chambers would be unable to function
