GENERAL ENGINEERING KNOWLEDGE – MEO CLASS 4 MMD PAPER

SECTION 4

1. Which of the following conditions should be used to support the need to change the lube oil when there has been an increase in the neutralization number?
   1. A decrease in the viscosity of the oil
   2. An increase in the viscosity of the oil
   3. A change in the cloud point
   4. A change in the floc point

ANS.: B

2. The purpose of bilge keels as an example is to reduce the amplitude of roll. What arrangements need to be made on a ship to achieve the following:
   1. lower the center of gravity of the ship
   2. reduce pitching
   3. reduce yawing
   4. reduce rolling

ANS.: B

3. A casing drain is provided for axial piston and bent axis variable stroke pumps to ___________.
   1. vent off any accumulated air from the system
   2. drain off any accumulated water from the pump casing prior to its being started
   3. assist the complete removal of hydraulic oil from the system prior to opening for major or minor repairs
   4. prevent damage due to agitation and overheating of oil accumulated in the casing as a result of minor internal leakage

ANS.: D

4. Increasing the speed of a rotary pump above its rated speed will result in most of the following conditions to occur?
   1. Increased suction
   2. Increased clearances
   3. Vibrations
   4. slippage

ANS.: B

5. After packing is added to the stern tube stuffing box, which of the following procedures should be observed to insure even tightening of the gland?
   1. Listen for a smooth, regular sound.
   2. Measure the distance between the gland and the stuffing box with a rule.
   3. Judge by feeling the gland for an increase in heat as it is being tightened up.
   4. Open the drain connection to allow seawater to flow in and make the distance even

ANS.: B

6. The temperature at which water vapor in the atmosphere begins to condense is called the ____________.
   1. dew point temperature
   2. condensation temperature
   3. psychometric temperature
   4. absolute humidity temperature

ANS.: A

7. One function of the air receiver in a compressed air system is to _____________.
   1. dry the air discharged from the intercooler
   2. minimize the system’s line pulsations
   3. receive exhaust air from pneumatic accessories
   4. remove all traces of oil from the air

ANS.: B

8. Which of the following statements describes the purpose of the split inflatable seal installed aft of the primary seal assembly for the propeller shaft?
   1. To serve as a seal when adding packing to the stuffing box.
   2. To allow repair or replacement of the primary seal elements when the ship is waterborne.
   3. To eliminate leakage via the propeller shaft when the shaft is not rotating.
   4. To provide a ready means for the entry of cooling water

ANS.: B

9. Why should a person performing maintenance on an air compressor wire and tag the system valves closed?
   1. To prevent the unexpected.
   2. To protect the equipment.
   3. To protect the operator performing the maintenance.
   4. Each of the above is correct.

ANS.: D

10. One of the main differences between the various types of screw pumps is in the __________.
    1. stuffing box diameter
    2. direction of rotation of the screws
    3. pitch of the screws
    4. type of driving gears

ANS.: C

11. The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to ____________.
    1. secure and tag the electrical circuit
    2. place a crow bar in the flywheel of the unit
    3. inform all persons in the area not to start the unit
    4. make a log book entry

ANS.: A

12. At which of the following locations would a duplex pressure gage most likely be located?
    1. Fuel oil service pump discharge flange
    2. Fuel oil strainer
    3. Fuel oil heater
    4. Fuel oil flow meter

ANS.: B

13. In any air system a safety device should be placed between any two points where air can be trapped between any two valves.
    1. Which can be closed manually.
    2. Between a non –return valve and a screw down valve.
    3. Between a non-return valve and a U-bend of a pipe.
    4. Between any valve and a nozzle

ANS.: 1,2

14. Some of the following are preferred refrigerants of the future(MCQ)
    1. Carbon dioxide  
    2. Refrigerant 11
    3. Refrigerant 502
    4. Ammonia
    5. Bromine
    6. Argon

ANS.: 2,3

15. Some of the following are preferred refrigerants of the future(Single choice)
    1. Carbon dioxide  
    2. Refrigerant 11
    3. Refrigerant 502  
    4. Ammonia
    5. Bromine
    6. Argon

ANS.: C

16. In the air conditioning of a ship a “Comfort Zone” constitutes
    1. Low humidity, low room temperature
    2. Low humidity, moderate temperature
    3. High humidity, moderate temperature
    4. Very low temperature, moderate humidity

ANS.: B

17. The passenger spaces of a passenger ship is protected against major fires by a
    1. High expansion foam system
    2. High density CO₂ system
    3. By a mixture of fire detection, fire retardant, ‘A-1 class bulkhead, fire doors, fire insulation and elabrate sprinkler system.
    4. High pressure steam system

ANS.: C

18. Sand impregnated with chemicals is kept in metal containers with a shovel, in the engine room, for the following purposes
    1. to cover small oil spills
    2. to use along with cement for doing repair jobs.
    3. for making the floor anti-skid by giving more friction.
    4. for use as grinding paste in case of emergency

ANS.: A

19. Which of the processes listed, consumes the greatest amount of power while producing the greatest amount of heat?
    1. Overcoming sliding friction
    2. Overcoming rolling friction
    3. Overcoming fluid friction
    4. Overcoming oil wedge friction

ANS.: A

20. Which of the following guidelines is considered to reflect good design practices of shipboard steam heating systems?
    1. Provide constant steam service for equipment operating throughout the year.
    2. Provide either a common or individual reducing station for each group of units requiring the same operating pressure.
    3. Run all piping so it may be drained by gravity.
    4. All of the above

ANS.: D

21. A distinguishing feature of an eductor, when compared to other pumps, is the ______________.
    1. discharge end being smaller than the suction end
    2. small size of impeller
    3. lack of moving parts
    4. ease at which the wearing rings may be changed

ANS.: C

22. When securing a flash-type evaporator for an extended period of time, you should _____________.
    1. fill the unit with saltwater
    2. fill the unit with descaling compound
    3. completely drain the unit
    4. tightly seal the unit to exclude air

ANS.: C

23. The portion of a hydraulic hose that determines its overall strength, is the _____________.
    1. inner tube
    2. braided inner layer(s)
    3. outer cover
    4. outer armor

ANS.: B

24. Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?
    1. Close radial clearance between impeller hub and casing
    2. Low rotational speed of impeller
    3. Removable end plate
    4. Replaceable impeller and casing wearing rings

ANS.: D

25. An acceptable method of dealing with accumulated oil found in the pump room bilges is to ______________.
    1. transfer the oil to the sea chest
    2. pump the oil into the slop tanks
    3. discharge the oil over the side on an outgoing tide
    4. pump the oil into a clean ballast tank

ANS.: B

26. A ship is required to carry an Oil Record Book, and must maintain the book as per rules on board for _______________.
    1. one year
    2. two years
    3. three years
    4. four years

ANS.: C

27. Which of the following actions, pertaining to saltwater lubricated stern tube stuffing boxes, is usually observed when the ship is expected to be in port for an extended period?
    1. The stuffing box is continually flushed.
    2. The drain connection is left opened.
    3. The stuffing box gland is tightened.
    4. The packing is adjusted for greater cooling or replaced

ANS.: C