sgsekm 4002

							                                                                                    SGED(M)
                                                                                     Sr. No. 4
                       EXAMINATION OF ENGINE DRIVERS OF SEA-GOING SHIPS
                                  ENGINEERING KNOWLEDGE
                                               (MOTOR)


                                        (Time allowed - 3 hours)

INDIA (2002)                                                              Total Marks 100
    N.B. -       (1) Attempt SIX questions ONLY.
                 (2) All questions carry equal marks.
                 (3) Neatness in handwriting and clarity in expression carries weightage

1. Issue a cautionary notice to the Navigation Watch Keeping Officer on too many engine
   movements during maneuvering, owing to under performing main air compressors. The
   notice should be in accordance with current practice in the company.

2. Sketch and describe any type of 4 stroke oil cooled piston used in medium speed marine
   diesel engines for main propulsion.

3. Write short notes on the following:
          (A) Friction losses and fuel consumption in auxiliary engines
          (B) The importance of stroke / bore ratio in engine performance
          (C) Noise reduction techniques used in main engines to improve noise level
               conditions for personel in the engine room.

4. What is the effect of vibration on the following fittings structures and components in a
    engine room
           (A) Main air compressor foundation
           (B) Main jacket Cooling water internal surfaces
           (C) Double bottom tanks
    Explain how these effects take place, specially the mechanism by which these effects take
place.

5. Which of the fuel injection systems listed uses a spring loaded differential spray needle
   valve and an individual pump for each cylinder?
          (A) Common-rail injection
          (B) Air injection
          (C) Jerk pump injection
          (D) Distributor injection
       Briefly Justify Your Answer

6. Proper lubrication of the main bearings is more easily obtained in a single acting four-
   stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine
   because ____________.
           (A) bearing pressure in a four-stroke/cycle single acting diesel engine is
               continually reversed
           (B) bearing pressure in a two-stroke/cycle single acting diesel engine is
               continually reversed
           (C) the maximum bearing pressure is higher in a single acting two-stroke/cycle
               diesel engine
           (D) two-stroke/cycle diesel engines require more complicated lubrication piping
       Briefly Justify Your Answer

7. The interior of some diesel engine saltwater heat exchangers are protected from corrosion
   by the use of __________.
           (A) aluminum plates
           (B) lead cathodes
           (C) copper baffle plates
           (D) sacrificial zincs
        Briefly Justify Your Answer


8. Increasing the valve clearance between a valve stem and rocker arm, will result in the
   valve _____________.
          (A) closing later
          (B) opening sooner
          (C) staying open for a shorter period of time
          (D) staying open for a longer period of time
       Briefly Justify Your Answer

9. Internal combustion engine crankcase vent outlets must be equipped with ______.

          (A) hinged rain guards
          (B) corrosion resistant flame screens
          (C) dipsticks for measuring oil levels
          (D) crankcase ventilation fans
       Briefly Justify Your Answer

10. The amount of chloride content in the water of an auxiliary boiler can be reduced by
    ____________.
           (A) adding hydrazine
           (B) blowing down the boiler
           (C) adding phenolphthalein
           (D) adding a sulfite chloride scavenger
        Briefly Justify Your Answer



                              -----------------X--------------------
                                                                              SGED(M)
                                                                               Sr. No. 4
                    EXAMINATION OF ENGINE DRIVERS OF SEA-GOING SHIPS
                               ENGINEERING KNOWLEDGE
                                           (MOTOR)


                                    (Time allowed - 3 hours)

INDIA (2002)                                                         Total Marks 100
    N.B. -     (1) Attempt SIX questions ONLY.
               (2) All questions carry equal marks.
               (3) Neatness in handwriting and clarity in expression carries weightage

                                      Answers

Answers for Question No. 5                Correct Answer : C

Answers for Question No. 6                Correct Answer : A

Answers for Question No. 7                Correct Answer : C

Answers for Question No. 8                Correct Answer : C

Answers for Question No. 9                Correct Answer : B

Answers for Question No. 10               Correct Answer : B