1. What are the different methods of protection regarding actual safety, cost and maintenance? Explain and compare the methods. 2. What are analysis, evaluation and construction as suggested by NFPA?...

1. What are the different methods of protection regarding actual safety, cost and maintenance? Explain and compare the methods.

2. What are analysis, evaluation and construction as suggested by NFPA?

3. (a) Draw the schematic diagram of an intrinsically safe installation and explain the

technique brie ly. (b) What is a zener barrier? How does it provide protection in an installation?

(c) Draw the balanced scheme of a zener barrier protection system and explain its operation.