Q4. (a) What causes cavitation in a Centrifugal pump operation? (6) (b) If the Engine room Bilge pump not taking suction, explore the probable reasons? (6) (c) Why is a centrifugal pump started with its discharge valve shut? (4)
Q5. (a) How will you align a motor-pump shaft? What are the different methods of alignment that can be used? (8) (b) Why is the Refrigeration Compressor often belt Driven? (8)
Q3. Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service? (16)
(a) Copper.
(b) Copper and carbon.
(c) Carbon.
(d) Bronze.
Briefly justify your answer.
Q7. If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be (16)
(a) Contaminated fluid
(b) Pitted thrust rings
(c) Worn pintle bearings
(d) Obstructed suctions passage
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