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Q5. Sketch and describe an arrangement for automatic connection of emergency batteries upon loss of main power, include in your answer:

(a) Means of obtaining d.c. charging supply from a.c. mains;

(b) A method of maintaining charge on lead acid batteries;

(c) The arrangement to check that batteries operate at loss of main power

(d) The length of time for which emergency batteries of passenger and cargo ships must provide power.