The separate supplies are connected in either star or delta formationThe star formation is most commonly used and requires（） slip-rings on the alternator.

After a ship enters service it is（） for the main bus-ba...

单项选择题After a ship enters service it is（） for the main bus-bar to be made dead.

（） is a machine by which electrical energy is transform...

单项选择题（） is a machine by which electrical energy is transformed into mechanical energy.

（） shall be continuously powered and shall have an auto...

单项选择题（） shall be continuously powered and shall have an automatic changeover to a stand by power supply in case of loss of normal power supply.