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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