Q1. Describe a three-element feed water controller (i.e., regulator) measuring steam flow, drum level and feed water flow and explain what relationship is maintained between the three variables and how?
Q9. Describe with a sketch a pneumatic relay and show how feedback can be achieved when such a relay is used in conjunction with a flapper mechanism. (16)
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
Q6. With regards to process control system explain following A. Proportional Control B. Integral Control C. Derivative Control D. The necessity of Derivative control
Q5. Explain the term “cascade control’ and sketch such a system suitable for use with a main engine jacket cooling water system. Show the variation of pressure and temperature at major points of the system.
Q3. A. Sketch and describe TWO methods that employ manometric means for measuring tank contents. (6)
B. State what corrections are made to the readings obtained by the methods described in (A) in order to gauge the mass contents? (5)
C. Explain how bunkering requirements may be estimated when no records of main engine fuel consumption are available on board. (5)
Q6. State why the temperature of lubricating oil supplied to an engine needs close control. Sketch and describe an arrangement and explain the principle of operation of instrumentation and control equipment for automatically maintaining the temperature of lubricating oil supplied to an engine at its desired value
Q8. (a) Describe, with the aid of a sketch, the main engine auxiliary equipment for automatic monitoring and regulation of the fuel viscosity.
(b) Explain the operation of the system, which incorporates the equipment described in Q.8(a).
(c) For an engine which is maneuvered on distillate fuel but operated on heavy residual oil at sea, static, as second engineer, the standing orders you would issue for the procedure to be adopted when changing form distillate fuel to heavy residual oil and vice versa.
Q6. An engine room is operating in the unmanned (UMS) mode, in the event of a failure of the UMS systems explain the arrangements a second engineer officer should introduce to operate the machinery in manual mode for a passage of 10 days’ duration.
Q9. (a) Define proportional control action.
(b) Sketch and describe a simple pneumatic proportional controller.
(c) State a process where a proportional controller may be employed.
(d) State the disadvantage of proportional only action.
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