GENERAL ENGINEERING KNOWLEDGE – MEO CLASS 4 MMD PAPER

Section 2:

1. ESD III refractory
2. Fire
3. Insulation
4. Membrane webs

2. Change in volume in closed cooling system is achieved by ________________

ANS.: Fresh water expansion tank 

3. Turbocharger most preferred
   1. Cheap
   2. Boost air pressure
   3. Increase efficiency
   4. Reduce NO_x

ANS.: C

4. Microbial degradation
   1. Corrosive
   2. Stable emission
   3. Caustic fire
   4. All the above

ANS.: A

5. Function of a de- superheater is to:

1. Protect superheater from overheat
2. Control superheater steam outlet temperature
3. Increase the efficiency of the boiler
4. Reduce steam temperature for auxiliary uses after steam superheater

ANS.: D

6. Why should combustion blowers left running for while after firing a boiler?
   1. To cool the furnace internal
   2. To remove the gases
   3. To cool tubes
   4. None

ANS.: B

7. Dezincification of brass can be prevented by introduction of additives like
   1. Nickel
   2. Cobalt
   3. arsenic
   4. Tungsten

ANS.: C

8. Principle of fire fighting onboard is
   1. Watering of fire
   2. Starving of fire
   3. Cooling
   4. Smothering of fire

ANS.: A,B,C

3. Which of the following used in boiler treatment is an oxygen scavenging
   1. Polymer
   2. Neutralizing amine
   3. Sodium sulphate
   4. Filming amine

ANS.: C

4. Salinity of distilled water produced depends upon _
   1. Amount of feed set
   2. Amount of salt water
   3. Temp of sea water inlet

ANS.: A

5. High pressure differential of a M/E LO filter only can be reduced by
   1. Back flushing filter
   2. Changing over to standby filter
   3. Change M/E

ANS.: B

6. High pressure differential of a M/E LO filter only can be reduced by
   1. Back flushing filter
   2. Changing over to standby filter
   3. Change M/E

ANS.: 1,2

7. In a shell and type M/E L.O. cooler, the temperature of L.O. is controlled by an automatic temperature control valve. Out at sea with M/E running at sea load it is observed that the temperature control valve opening to the cooler is increasing day by until it becomes 100% open to the cooler. The L.O. outlet temperature _______________ after the above condition has reached
   1. Start increases immediately
   2. Start decreases immediately
   3. Will be maintained at the set point
   4. Can’t maintain at the set point and decrease slowly

ANS.: D

8. Fixed vane type emergency fire pump priming vacuum pump. After one week fire pump not taking suction. The vacuum pump is engaging, but not developing vacuum in the suction side. What will be the cause?
   1. Suction filter of the pump clogged
   2. Suction filter cover gasket leaks
   3. Vacuum pump not overhauled properly
   4. Sealing water tank is empty

ANS.: D

9. Single screw pump used as sludge pump the correct technical name.
   1. Snake pump
   2. Screw pump
   3. Progressive cavity pump
   4. Gear pump

ANS.: C

10. Excessive lubricator in compressor leads to
    1. Decompression
    2. Detonation
    3. Sticking in valves
    4. Carry over and deposit of all particles in pipe line and reservoir

ANS.: 1,2,3

11. Corrosion occurs in cooling fresh water system of marine diesel engine
    1. Stress corrosion
    2. Hot corrosion
    3. Bimetallic corrosion
    4. Selective phase corrosion

ANS.: D

12. Purpose of evaporator in domestic refrigeration system
    1. To transmit latent heat of evaporation
    2. To absorb latent heat of fusion
    3. To absorb latent heat of evaporation
    4. To transmit latent heat of fusion

ANS.: C

13. Sudden closing and opening of valve in sea water pipeline leads to
    1. Cavitations
    2. Water hammering
    3. Steam hammering
    4. There is no problem

ANS.: B

14. Centrifugal pump change over for pumping liquid of high specific gravity the discharge at the rated capacity will be
    1. Increase
    2. Decrease
    3. Same
    4. Convert 50%

ANS.: C

15. Centrifugal pump change over for pumping liquid of high specific gravity what will change?
    1. Discharge pressure
    2. Discharge head
    3. Power consumption
    4. Pump speed

ANS.: C

16. Centrifugal pump change over for pumping liquid of high specific gravity what will change?
    1. Discharge pressure
    2. Discharge head
    3. Power consumption
    4. Pump speed

ANS.: 1,3

17. Weldability steel depends on carbon equivalent
    1. CE<= 0.35
    2. CE between O.36 AND 0.4
    3. CE between o.41 and o.45
    4. CE between o.46 and o.5

ANS.: A

18. Sea water outlet temperature of LO cooler decreased while main engine load and sea water inlet temperature not changed this indicates
    1. Cooler efficiency has increased
    2. Cooler efficiency has decreased
    3. Sea water outlet temp nothing to do with efficiency
    4. The flow of sea water reduced

ANS.: B

19. Ballast pump suction filters during ballast in port purpose of getting blocked frequently you should
    1. Remove the suction filter
    2. Clean frequently as required and also open and check the sea chest filter
    3. Stop using the pump and keep fill in gravity
    4. Stop the ballast operation

ANS.: B

20. When steel components electroplated with chromium are used in corrosive environment
    1. Chromium plating provides corrosion protection to the steel components
    2. Chromium plating cannot provide corrosion protection as steel will be preferentially corroded
    3.  Zinc plating is to be used on top of chromium plating for
       corrosion protection
    4. Thickness of chromium plating is required to be increased for corrosion protection

ANS.: A