Tuesday, October 31, 2017

EKG III some Questions sep-17

1.   a)  Briefly explain the Concept of Integrated Bilge Water Treatment System (IBTS).                                                                                                                                                                                                  [4 Marks]
b)   Sketch and describe a Pre-treatment unit for oil separation which can be used                   incorporated with IBTS                            [4 Marks]
c)   State the definition of “Oil residue        sludge)”   [3 Marks]
d)  Draw a flow diagram of oil residue (sludge) collection and disposal arrangement which can be used incorporated with IBTS                   [5 Marks]                           
2.           a) 1) List the safety devices fitted on fuel-oil settling tanks, daily service tanks.                          2) State the reasons for fitting such safety devices.                           marks]
                      3) State what attention requires for above safety devices.                                [2 marks]
              b)  Describe with aid of a sketch a fuel oil supply line to a 2-Stroke Cross head type  Marine Diesel Engine indicating the safety devices, position and type of valves were fitted to ensure satisfactory operations of the fuel oil supply system.                                                   [6marks]
                 c) State the routine maintenance and inspections on above (b) mentioned fuel oil supply system to avoid/control any flammable oil spillage.                                                                                                 [6 marks]
3.          a) State how is the capacity of an air compressor specified                                           [2 Marks]
              b) Describe with an aid of a line diagram, the compression process of a two-stage air compressor indicating each stage air pressure and temperature.                                                                     [3 Marks]
              c) Describe how is the running gear of reciprocating air compressors lubricated      [3 Marks]
              d) Describe the bearing replacement procedure of a two-stage air compressor mentioning the necessary inspections and calibrations of its components.                                                                                    [8 Marks]
4.           a) Briefly explain with the aid of sketches, the control mechanism of following Electronic Control Equipment;
                 1) A digital sequential control device                                                    [3 Marks]
                2) An integrated Automation Control and Monitoring System (IACMS)                [3 Marks]
                3) A  Computer programmable                                                                              [3 Marks]
              b) State how Electronic control equipment cited above (a) are utilized for main and auxiliary machineries                                                                                                                          [3 Marks]
               c) Draw and explain a flow chart indicating automatic control system for main engine or generator control system.                                                          [4 Marks]
5.
               a) Briefly discuss the effects of Ozone Depletion substances on human health and environmental.                                                                                           [2 marks]
               b) Explain how to collect the refrigerant into a recovery bottle form a refrigerator plant
                                                                                                                                                                  [3 Marks]
               c) State how make the following leak tests for a refrigerator plant;
                                        1)        Pressure test                                                               [2 Marks]
                                        2)        Vacuum test                                                                                        [2 Marks]
              d) Explain how to charge refrigerant into a refrigerator plant                                        [3 Marks]
              e)    1) State the preparation and precautions for starting a refrigerator plant           [2 Marks]
                      2) State how operating condition of a refrigerator unit is identified in a good working order.                                                                                                                     [2 Marks]
6.           a) Define followings, for an elastic material subjected to a tensile load;
                               1)         elastic limit                                                                                                   [1 Mark]
                               2)         yield point                                                                                                     [1 Mark]   
                               3)         breaking strength                                            [1 Mark]
               b) State how vibration is caused on the elastic materials         [3 Marks]
               c) Describe the main sources of ship vibration                           5 Marks]
               d) Explain how ship vibration may be reduced.                         [5 Marks]
7. With reference to a hydraulic system, suitable for the operation of deck machinery.
                a) Sketch a line diagram showing the layout and components                       [8 Marks]
                b) Describe the operation of the system sketched in above (a)                      [8 Marks]
Section-B
       8. a) name the materials commonly used for the following part of cables.
                  1)       Conductors                                                                                                                     [1 Mark]
                  2)       Insulation                                                                                [1 Mark]
                  3)     Sheathing                                                                                 [1 Mark]
            b) Explain the following electrical diagrams
                   1)       Block Diagram                                                                                                               [2 Marks]
                   2)       System Diagram                                                                                                            [2 Marks]
                   3)       Circuit Diagram                                                                                                              [2 Marks]
                   4)        Wiring Diagram                                                                                                             [2 Marks]
            c) Sketch a circuit diagram for the following wiring diagram                          [5 Marks]
9          a) Explain the following characteristics of semiconductors 
                             1) photoelectric effect                                                                                                                                  [2 Marks]
                             2) thermoelectric effect                                                                                                 [                         2 Marks]
                               3) Communicating action                                                                                               [2 Marks]
                             4) hall effect                                                                                                                      [2 Marks]
              b) 1) Define Integrated Circuit (IC) and Large Scale Integrated Circuit (LSI) as circuit elements
                                                                                                                                                                          [2 Marks]
                   2) Describe the structure of an IC                                                                                            [3 Marks]
                   3) Describe briefly the functions of the following types of IC Complementary Metal-Oxide Semiconductor (CMOS)                                                                                                                                 [3 Marks]

Section-C
10. a) 1) Define the propeller singing                                                                                                         [2 Marks]
           2) Explain generation mechanism of propeller singing and preventive measures.                 [2 Marks]
      b) Describe with aid of sketches, a controllable pitch propeller (CPP) and its mechanism of changing blade   Angle                                                                                           [         6 Marks]
       c) Explain how propellers fit on propeller shaft.                                            [6 Marks]
11. Explain how external hull corrosion is inhibited by EACH of the following.
       a) Design and maintenance.                                                                                                  [6 Marks]
       b) Impressed current system.     protection.                                      [5 Marks]

       c) Cathode                                                                                           [5 Marks] 

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