Electrical Installations, Dangers. Test 1

Which of the following statements about shaft alternators is true ?

Shaft alternators produce direct current.
They produce the electrical power when a ship powered by medium speed diesels is at sea.
Shaft alternators produce the electrical power on steamships.
They are only found on ships powered by slow speed diesel engines.

What are the prime movers that can be used to drive medium to large size industrial alternators ?

Ohms are a measure of which of the following ?

On board ship an electrical transformer is used to _____

Which of the following statements about electrical fuses is true ?

A regularly failing fuse should be replaced with one of a high rating.
When a fuse fails it is necessary to replace it immediately.
After a fuse has failed it restores the current automatically once the fault has been found.
Fuses protect circuits and people from excess current automatically.

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