Q1. With reference to centrifugal pumps and pumping systems. A) Under what conditions, a centrifugal pump require a priming device for pump to operate normally? B) Draw a neat graph and explain and the performance curves of a centrifugal pump.
Q2. A. List the various type of valves used on board ship relating to the function required. B. With the help of sketch, describe how a screw down non-return globe valve be made a return valve?
Q3. Explain the working principle of differential Pressure Transmitter with the help of diagram and explain the following parts with
their usages. A. Zero and span calibration B. Negative feedback bellow C. Pilot amplifier functions D. Zero Elevation Concept
Q4. A) Explain the advantages of using hollow shaft in place of solid shaft for intermediate shaft in propulsion system. B) With the aid of a simple sketch describe the lubrication system of Plummer block bearing.
Q5. With respect to heat exchanges used on board ship A) Explain parallel and contra flow B) Draw a neat diagram showing the expansion arrangement of tubes in a tube and shell type heat exchanges C) What are the factors taken into account while deciding the number of phases for fluid at the design stage?
Q6. With regards to process control system explain following A. Proportional Control B. Integral Control C. Derivative Control D. The necessity of Derivative control
Q7. With respect to Main Air compressors explain the effect of the following on the running of the compressor A. Improper bumping clearance B. Improper connecting rod bearing clearance C. Fouled air intake filters D. Fouled after cooler
Q3. With regards to boiler water level control. Explain the following
A. Shrink and swell phenomenon B. Cascade control C. Split control D. Condensing chamber – Function and location.
Q9. With reference to electro hydraulic steering gear systems with four rams A. With the aid of a sketch describe the working principle of hydraulic pump. B. Explain the method adopted to prevent hydraulic oil leakage along the rams C. Discuss the methods
adopted to prevent damage to the steering gear due to jumping of rudder in heavy sens.
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