Motor Engineering – MEO CLASS 4 MMD PAPER

SECTION 6

1. Temperature at which hazing of oil is called
   1. Haze point
   2. Cloud point
   3. Floc point
   4. Flash point

ANS.: A

2. Operating pressure of which type is greater?
   1. Ram type
   2. Rotary vane
   3. Both are almost same
   4. None of them

ANS.: A

3. Which steering gear type is electro hydraulic?
   1. Ram type
   2. Rotary type
   3. Both
   4. None

ANS.: C

4. Sealing arrangement of T/C of Main engine.
   1. Compressed air with 30 bar
   2. Control air
   3. Air directly from compressor of T/C.

ANS.: C

5. When cross head bearing of a large 2 stroke marine engine on a cargo ship is opened up for survey is mandatory for the cross head to be inspected by the
   1. port state inspector
   2. cargo gear surveyor
   3. ISM auditor
   4. Attending workshop superintendant

ANS.: D

6. The temperature, at which a fuel will start to burn under given conditions, is called its, ignition temperature. This temperature varies greatly with
   1. Composition of the air-fuel mixture.
   2. Amount of excess air.
   3. Size, shape and temperature of the compression space.
   4. All the above

ANS.: D

7. VESSEL IS AT DRYDOCK , WHO ISSUE HOT WORK PERMIT…???

1. Options were CE
2. 2E
3. shipyard engineer
4. Ship superintendant

ANS.: C

8. Following method is sometimes used in constant pressure turbochargers of a 4-stroke diesel alternators during starting and rapid acceleration:
   1. Auxiliary electrical blowers assisting turbochargers during starting
   2. Auxiliary shaft driven blowers assisting turbochargers during starting
   3. Auxiliary air drive for turbocharger acceleration during starting
   4. Variable geometry turbocharging

ANS.: D

9. Automatic combustion control systems for some auxiliary boilers are designed to cycle burners on in response to
   1. low fuel pressure
   2. fuel return pressure
   3. low steam pressure
   4. furnace air pressure

ANS.: C

10. A normal manometer reading of turbocharger air suction filter and normal speed of the turbocharger but reduced scavenge air pressure may be due to:
    1. Fouling of the nozzle ring
    2. Fouling of diffuser or compressor wheel
    3. Fouling of the turbine
    4. Cold climate

ANS.: D

11. Abnormal wear occurring in engines due to localized welding and fracture is known as
    1. Scoring
    2. Scuffing
    3. Peeling
    4. None of the above

ANS.: B

12. The bearings used to support the crankshaft are generally called
    1. line shaft bearings
    2. connecting rod bearings
    3. main bearings
    4. support bearings

ANS.: C

13. Which of the following statements is true?

1. A fuel with high cetane index has longer ignition lag and is associated with better combustion.
2. A fuel with high cetane index has shorter ignition lag and is associated with better combustion.
3. A fuel with low cetane index has longer ignition lag and is associated with better combustion.
4. A fuel with low cetane index has shorter ignition lag and is associated with better combustion

ANS.: B

14. The flame safeguard control system of a large automatic auxiliary boiler will provide fuel shut off in the case of high

1. water
2. voltage
3. fuel pressure
4. steam pressure

ANS.: D

15. What prevents rotation and fretting between a thin shell bearing and its housing ?
    1. Location tangs or pegs
    2. The nip or crush of the bearing
    3. A special kind of adhesive
    4. Any of the above

ANS.: B

16.Which of the following can be a consequence of worn scraper rings and sealing rings of a piston rod stuffing box?

1. Increased risk of scavenge fire
2. Increased risk of crankcase explosion
3. Increased Lube oil consumption
4. All of the above

ANS.: D

17. Which of the following types of crankshafts is much lighter at similar power requirements?
    1. Fully built type
    2. Semi built, all welded type
    3. Semi built type
    4. Solid forged type

ANS.: B

18. Which of the following types of scavenging systems is most popular in modern engines?
    1. Loop scavenging
    2. Cross flow scavenging
    3. Uniflow scavenging
    4. Reverse scavenging

ANS.:  C

19. Steam temperature control for the ESD boiler is achieved by :
    1. Fitting a de-superheater between 1st & 2nd passes of superheater
    2. Fitting an attemperator between 1st & 2nd passes of superheater
    3. Bypassing the superheater
    4. Gas dampers in boiler uptake

ANS.: B

20. Which of the following statements is true?
    1. The TBN value of cylinder oil should be ideally matched with the sulfur content of the fuel.
    2. The TBN value of cylinder oil is not a function of the sulfur content of fuel oil.
    3. Cylinder oils with higher TBN values should be used for fuel oils with lower sulfur content.
    4. The TBN value of cylinder oil is a function of maximum combustion pressure.

ANS.: A

21. The super long stroke slow speed 2-stroke diesel engines when compared to short stroke version gives:
    1. Poorer propulsive efficiency but better fuel combustion
    2. Better propulsive efficiency but poorer fuel combustion
    3. Better propulsive efficiency as well as better fuel combustion
    4. Poorer propulsive efficiency as well as poorer fuel combustion

ANS.: C

22. Coked material remaining after an oil has been exposed to high temperature, is an indication of the coke forming tendency of the oil. It can be expressed as
    1. Conradson
    2. Ramsbottom
    3. Micro Carbon Residue(MCR)
    4. Any of the above

ANS.: A

23. The purpose of valve spindle rotators in case of exhaust valves of modern two stroke engines is to:
    1. Improve engine efficiency by allowing even temperature distribution through the combustion chamber
    2. Allow even temperature distribution along the disc of the valve spindle, even wear rate and removal of any deposits
    3. Utilising waste energy in the exhaust gases to increase the engine efficiency
    4. Allow exhaust gases to exit in a rotational motion, inducing good draught of scavenge air for better mixing of air and fuel for effective combustion

ANS.: B

24. In modern 2-stroke marine diesel engines the exhaust valves are:

1. Mechanically actuated
2. Pneumatically actuated
3. Hydraulically actuated
4. Electrically actuated

ANS.: C

25. Which of the following is a proper practice to follow in the event of discovery of a small soot fire in exhaust gas boilers?

1. Repeated soot blowing
2. Stopping cooling water circulation
3. Reducing main engine speed
4. Opening the inspection doors and extinguishing the fire

ANS.: C

26. An additive added to a lubricant to keep engine parts clean is known as ______________
    1. Dispersant
    2. Detergent
    3. Cleaning agent
    4. None of the above

ANS.: B

27. The scavenge ports of a uniflow scavenged 2-stroke engine cylinder liner are machined at an oblique angle to the axis of the cylinder, why ?
    1. To prevent exhaust gases from coming out of scavenge ports
    2. To allow rotary motion to scavenge air to reduce exhaust gas temperature for reduced NOx emission
    3. To allow rotary motion to scavenge air for better scavenging and better air-fuel mixing
    4. To allow rotary motion to scavenge air for better cylinder oil distribution on the liner walls and better turbocharger performance

ANS.: C

28. Both power units of a steering gear system need to be switched on ______________
    1. When the ship is within 12 nautical miles from shore.
    2. When pilot is on board
    3. When navigational circumstances demand caution
    4. ALL

ANS.: D

29. The kinetic energy imparted to air by the compressor impeller of a turbocharger is converted into pressure energy at the:
    1. Nozzle ring
    2. Diffuser ring
    3. Inducer ring
    4. None of the above

ANS.: B

30. Which of the following is one of the disadvantages of cast iron chokes, used in holding down arrangement of engines?
    1. Poor compressive strength
    2. Poor vibration damping
    3. Cast iron is brittle and prone to crack
    4. All of the above

ANS.: C

31. Economisers are built up with
    1. Copper tubes
    2. Plain steel tubes
    3. Stainless steel tubes
    4. Steel tubes fitted with shrunk on C.I. grills

ANS.: D

32. Which of the following is the primary advantage of supercharging the air quantity in a diesel engine, by means of a turbocharger?
    1. It leads to considerable gain in thermal efficiency.
    2. It increases the maximum pressure generated in a cylinder appreciably.
    3. It improves the power to weight ratio of the engine
    4. All of the above

ANS.: D

33. Only a pre determined fixed amount of water should be used during:
    1. Water washing of the turbine side of a turbocharger
    2. Water washing of the blower side of a turbocharger
    3. Water washing of both blower and turbine sides of a turbocharger.
    4. Exhaust gas boiler water washing

ANS.: A 

NEW SECTION – 1

1. The pH value of water in a diesel engine closed cooling water system should be maintained between____
   1. 6.0 to 7.5
   2. 8.0 to 9.5
   3. 10.0 to 11.5
   4. 12.0 to 13.5

ANS.: B

‎2. A diesel engine fails to start, even though it can be barred over, but not cranked over. The probable cause is _________________.

1. a seized piston
2. an improperly fitted bearing
3. a closed or obstructed air starting line valve
4. insufficient compression

ANS.: C

3. At which of the following locations would a duplex pressure gauge 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

4. Efficient soot blowing of exhaust gas economizers and boilers is essential_____________
   1. To minimize chances of soot fire
   2. To increase efficiency
   3. To minimize chances of heavy corrosion and localized heating leading to tube failure
   4. All of the above

ANS.: D