GENERAL ENGINEERING KNOWLEDGE – MEO CLASS 4 MMD PAPER

Section 3:

1. The pressure produced within the oil wedge of a rotating journal is ____.
   1. the same as the pressure in the lubricating system
   2. less than the pressure in the lubricating system
   3. greater than the pressure in the lubricating system
   4. highest at the oil groove location

ANS.: C

2. Which of the main shaft segments listed below, that are connected with the main engine, are coupled to the tail shaft flange?
   1. Thrust shaft
   2. Stern-tube shaft
   3. Intermediate shaft
   4. Crank shaft

ANS.: C

3. Piping cross-sections over 30 cm in diameter are sized by the __________.
   1. inside diameter
   2. wall thickness
   3. outside diameter
   4. threaded diameter

ANS.: C

4. The ambient heat in an engine room which is identified by only a change in temperature is known as
   1. sensible heat
   2. latent heat
   3. total heat
   4. residual heat

ANS.: A

5. The usual number of single-acting pistons used in a variable stroke axial-piston pump used for steering gears is _____________.
   1. 3 or 5
   2. 5 or 7
   3. 7 or 9
   4. 9 or 11

ANS.: C

6. Heavy soot accumulations in an auxiliary boiler could be caused by _____
   1. water in the fuel oil
   2. excessive cycling
   3. high fuel oil pressure
   4. improper burner maintenance

7. An axial piston pump differs from a radial piston pump, as the pistons of an axial piston pump are positioned _________.
   1. radially from the shaft
   2. parallel to each other and to the shaft
   3. parallel to each other but at a right angle to the shaft
   4. at an angle to each other and to the shaft

ANS.: B

8. In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be _____________.
   1. superheated
   2. saturated
   3. condensed
   4. convected

ANS.: B

9. Positive displacement, helical gear pumps are well suited for pumping oil because
   1. stuffing boxes eliminate the leakage problems usually associated with other gear pumps
   2. it is not necessary to closely maintain design clearances this pump
   3. they are essentially self-priming and produce a high suction lift
   4. these pumps are designed with extreme tooth angles

ANS.: C

10. The conical steel or composition cone installed on a propeller, known as a fairwater cone, provides which of the following benefits?
    1. Reduce turbulence
    2. Help with lubrication
    3. Protect against electrolytic corrosion
    4. All of the above

ANS.: A

11. It is desirable for an auxiliary boiler safety valve to pop open and reseat quickly to
    1. give warning that excessive boiler pressure has been reached
    2. prevent wire drawing of the disc and sea
    3. prevent valve pounding
    4. provide sufficient blow down

ANS.: B                                   

10. The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to
    1. cool the furnace to prevent pre-ignition
    2. remove explosive vapors from the furnace
    3. evaporate accumulated unburned fuel oil
    4. provide sufficient air in the furnace to allow ignition of the fuel

ANS.: B

12. Short cycling of a refrigeration compressor refers to _____________.
    1. Frequently cutting out on over load.
    2. frequently starting and stopping
    3. running too fast
    4. running too slow

ANS.: B

13. The emergency bilge suction valve is typically used _____________.
    1. to inject cleaning additives when the bilges are extremely dirty
    2. when the main condenser becomes fouled, in order to provide additional cooling water circulation
    3. to connect the rose box to the independent bilge suction
    4. if the bilges become flooded and they cannot be emptied by any other means

ANS.: D

14. The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally
    1. removed by cellulose type filters
    2. gums, varnishes, and acids
    3. always neutralized by oil additives
    4. harmless and have no effect on system components

ANS.: B

15. Which of the following describes the purpose of a striker or doubler plate?
    1. Provides a surface for the application of force, or the installation of machinery.
    2. Provides landing surface for the sounding bob of a tank sounding tape.
    3. Absorbs machinery vibration.
    4. Prevents valve stem over travel

ANS.: B

16. Which of the following statements represents the proper relative direction of flow through a globe valve?
    1. Direction of flow through the valve is unimportant.
    2. Direction of flow through the valve depends upon the type of seat design used in the valve.
    3. Direction of flow should be from below the seat.
    4. Direction of flow should be from above the seat.

ANS.: C

17. A portion of the cargo of an LNG carrier boils off during each voyage. How the cargo boils off is normally handled?
    1. Compressed, condensed, and returned to the cargo tanks.
    2. Vented to the atmosphere.
    3. Burned in the boilers.
    4. Mixed with nitrogen and recirculated through the primary barrier.
    5. Burnt off in a controlled manner through a chimney smoke stack from within the funnel.

ANS.: C

18. In Vessel construction, beam brackets are triangular plates joining the deck beam to a
    1. bulkhead
    2. frame
    3. stanchion
    4. deck longitudinal

ANS.: B

19. The cylinders and intercoolers of most low pressure air compressors are cooled by _
    1. water
    2. oil
    3. air
    4. CO₂

ANS.: C

20. A one ton air conditioning system has which of the listed operating characteristics?
    1. It forces approximately 1000kgs of refrigerant through the evaporator per day.
    2. It forces approximately 1000kgs of air per hour across the evaporator coils.
    3. Its cooling power equals that of melting approximately 1000kgs of ice per day.
    4. It contains approximately 1000kgs of refrigerant.

ANS.: C

21. Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?
    1. Copper
    2. Copper and carbon.
    3. Carbon
    4. Bronze

ANS.: C

22. When using a handheld hacksaw, you should apply pressure only on the forward stroke ____________.
    1. only when cutting thin wall tubing
    2. only when cutting carbon steel
    3. only when cutting conduit
    4. at all times

ANS.: D

23. An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to ____________.
    1. have a high viscosity index
    2. mix readily with refrigerant
    3. have a high freezing point
    4. have a low pour point

ANS.: D

24. If the intercooler relief valve lifts while an air compressor is operating under load, you should check for ____
    1. a defective pressure switch or pilot valve
    2. a leak in the intercooler piping
    3. leakage through the low pressure unloader control diaphragm
    4. leaking high pressure discharge valves

ANS.: D

25. Latent heat can be defined as the heat which must be added to a substance in order to change it from a
    1. solid to liquid
    2. liquid to vapor
    3. solid to vapor
    4. all of the above

ANS.: D

26. The designation “schedule 80 extra strong ” refers to ____________.
    1. weight of steel plate
    2. tensile strength of bolts
    3. piping wall thickness
    4. tube bursting strength

ANS.: C

27. Tapping threads into a blind hole should be finished by using a ______
    1. short tap
    2. taper tap
    3. plug tap
    4. bottoming tap

ANS.: D

28. Distilled water from an evaporator may be discharged into a potable water tank
    1. through a detachable hose connection
    2. after passing through an activated charcoal filter
    3. after chemical analysis shows it is fit for consumption
    4. through a solenoid operated three-way valve

ANS.: D

29. The factors that determine the service life of packing in a pump will include which of the following conditions?
    1. type of pump
    2. condition of the shaft
    3. length of time in use
    4. all of the above

ANS.: D