With reference to boiler and steam generation systems:
(a) Explain the term water hammering, stating how it is caused and describing the possible consequences of it (4)
(b) Explain how water hammering can be avoided (4)
(c) Describe, with the aid of a sketch, how the boiler fuel system may be operated on port to comply with local emission control regulations (8)
UKM Tuticorin 
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