单项选择题

After resolving the trouble of main power supply, main switch of emergency generator should（）, if power supply is refreshed.

A.be switched off by the duty officer
B.be switched on by the duty officer
C.be switched off automatically
D.be switched on automatically

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单项选择题

Emergency generator is installed on board mainly to （）

A.connect to the busbar when the load increasing
B.supply power specially to charging panel
C.be put into operation during the ship arriving at or leaving port
D.ensure the power supply to critical equipment after the main switchboard out of power

单项选择题

（）is not installed on the emergency switchboard.

A.Ammeter
B.Voltmeter
C.Wattmeter
D.Synchroscope

单项选择题

（）belongs to emergency power supplying equipments.

A.argo winch
B.Windlass
C.Steering gear
D.Air compressor