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Q7. Define briefly the construction details peculiar to each of the following types of closure that enables their primary function to be fully realized:

A. Water tight doors;             B. Fire proof doors; C. Gas tight doors,

D. With reference to above doors, State why (A) can perform function of (B) as well as of (C), whereas function of (B) and (C) are restricted solely to their primary function.

Q6. With respect to the hazardous areas of tankers,

A. Explain the term flameproof (Ex d) for electrical equipment;

B. State the type of electrical equipment that would be protected in this way.

C. List likely defects of flameproof equipment.