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Q7. A. Explain why centrifugal pumps cannot handle air or vapours to effect priming yet turbo- blowers operating on the same principle can.

B. If a vessel is fully laden, how may it be ascertained that the fire pump priming arrangements would operate satisfactorily in the ballast condition.

C. Explain a suitable method of priming suitable for a centrifugal pump.

Q6. A Centrifugal pump has been opened up due to abnormal noise:

a) List the checks you will carry out on various parts (4)

b) Name the parts which may require replacement. (4)

c) Checks to be carried out after assembly. (4)

d) Operational parameters, which may be required to be compared with manufacturers test records. (4)

Q4. a) Describe procedure for safe Isolation of Centrifugal Pump prior maintenance work. (6)

b) Describe in detail routine maintenance carried out on the pumps. (10)

Q7. a) Describe following terms used for pumps,

i) Flow Rate. (2)

ii) Pressure. (2)

iii) Head. (2)

iv) Net Positive Suction Head. (2)

b) During watch keeping round what checks are required on a running centrifugal pump? (8)

Q3. Performance of a Fire-pump has deteriorated and is not developing required head. Describe the following:

a) The procedure for dismantling the pump. (4)

b) The likely defects and remedial measures to be taken. (3)

c) Which all Clearances are to be checked. (3)

d) Precautions during assembly. (3)

e) Checks for alignment of motor pump coupling. (3)

Q4) Describe with the aid of suitable graph, the discharge characteristics of a centrifugal pump. Explain why it does not require a relief valve (16)