GENERAL ENGINEERING KNOWLEDGE – MEO CLASS 4 MMD PAPER

SECTION  – 7

1. Which of the following statement is true if the oil temperature is allowed to become excessively high in the heaters?
   1. Excessive temperature will increase oil viscosity that results to poor combustion
   2. Excessive temperature will cause the oil to crystallize resulting in pulsating fires
   3. The fuel will carbonize and its heating ability will be reduced
   4. The fuel will ignite even it has not reached point of ignition

ANS.: C,D

2. A drop in compression pressure in one cylinder of a diesel engine can be caused by ___________.
   1. only fuel injection
   2. burned valves
   3. too late fuel injection
   4. low fuel penetration

ANS.: B

3. Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling temperature from an individual cylinder begins to rise, what should you suspect?
   1. That there is an overloading of cylinder
   2. That there is an overloading of the adjacent cylinder
   3. That there is an increase blow-by of the cylinders
   4. That there is an incomplete combustion in that cylinder

ANS.: A,C,D

4. Which of the listed actions should be carried out if a ship is to be laid up for an indefinite period of time ______.

I – Boilers to be laid up wet should be completely filled

II – All fuel tanks should be cleaned & gas freed

III – All potable water tanks should be cleaned & disinfected

1. I only
2. II only
3. I & II
4. I, II & III

ANS.: A

5. Adding trisodium phosphate in boiler water will _______.

I – Decrease salinity

II – Increase salinity

III – Decrease alkalinity

1. I only
2. II only
3. I & II
4. I, II & III

ANS.: A

6. A shortage of refrigerant in the refrigeration system is indicated by ___________.
   1. the compressor short cycling
   2. high head pressure
   3. high suction pressure
   4. bubbles in the sight glass

ANS.: D

7. Directional control v/v used in hydraulic p/p is controlled
   1. manually
   2. mechanically
   3. electrically
   4. all

ANS.: D

‎8.  Electric and electro-hydraulic steering gear motors are required by Coast Guard Regulations (46 CFR) to be _________.

1. protected by a circuit breaker set at 125% and a thermal overload device
2. provided with a running motor overcurrent protection device
3. served by a single two conductor cable
4. served by two feeder circuits

ANS.: D

9. Dezincification of brasses may be prevented by introducing which of the following additives during manufacturing brass?
   1. 0.04% Nickel
   2. 0.04% Cobalt
   3. 0.04%Arsenic
   4. 0.04%Tungsten

ANS.: C

10. One cause of leaky valves in a low pressure air compressor may be attributed to..USCG Q. 90
    1. running with an air filter element different from that required by the original manufacturer’s specifications
    2. excessive operating hours without carrying out preventive maintenance
    3. the compressor running too fast
    4. excessive discharge pressure

ANS.: B

11. The static suction lift of a pump is the difference in elevation between the
    1. centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump
    2. centerline of the pump and the suction liquid level when the source of liquid is above the pump
    3. centerline of the pump and the level of the discharge liquid
    4. liquid levels of the suction and discharge

ANS.: A

12. Plate type heat exchangers are preferred over shell and tube type ones because ____________
    1. They can be cleaned more thoroughly.
    2. Their capacity can be altered by adding or removing plates.
    3. Turbulent flow and more margin for increased fluid velocity ensures less deposits and hence longer time interval between cleanings.
    4. All of the above

ANS.: D

13. Preferential tripping of electrical machineries prevents
    1. Overloading of generators
    2. Black out in engine room
    3. Allows starting of large machineries
    4. None of the above

ANS.: A,B

14. Which is the only gas product ,allowed by gas codes, to be burnt in ship’s boilers?
    1. LPG
    2. Ethylene
    3. Butane
    4. LNG

ANS.: D

14. Frequent cutting- in & cutting -out of a fresh water pump on a hydrophone system indicates which of the following?
    1. Nothing abnormal
    2. Excessive air charge
    3. Insufficient air charge.
    4. The differential setting between cut-in and cut out is too low

ANS.: D

15. 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

16. You must have worked with mooring winch and windlass hydraulic systems. The cooling of hydraulic oil for the above system on large merchant ships is provided by:
    1. There is no cooling arrangement as the system doesn’t require cooling
    2. Air cooled hydraulic reservoir
    3. Water cooled plate or shell type heat exchangers
    4. Radiator and fan arrangement

ANS.: C

17. In case of failure of the control system of a centrifuge, the correct sequence for manually desludging a purifier would be-
    1. Stop feed-give sealing water-close sealing water -shut operating water-open and close desludging water quickly
    2. Stop feed- shut operating water-open and close desludging water quickly
    3. Shut operating water-stop feed- open sealing water for a short time then close-open and close desludging water quickly
    4. Shut operating water- stop feed- open and close desludging water quickly

ANS.: A

18. Liquid ring primer used for priming main and emergency fire pumps onboard
    1. Is to be filled with water in the water tank to maintain water level
    2. Is to be capable of automatic engagement and disengagement with drive shaft
    3. Is to have sufficient capacity to exhaust air out from pump in all sea conditions
    4. All of the above

ANS.: D

19. Back pressure valve in a refrigeration system with multiple chambers is fitted _____________

1. At the refrigerant exit end of evaporator of each chamber
2. At the refrigerant exit end of evaporators of chambers with higher temperature settings
3. At the refrigerant exit end of evaporators of chambers with lower temperature settings
4. None of the above

ANS.: B

20. Inert Gas System on board tankers is used during which of the following operations-
    1. Inerting of empty tanks
    2. Inerting during crude oil washing
    3. Purging before gas freeing
    4. All of the above

ANS.: D

21. To prevent main engine stoppage during periods of bad weather

1. Ensure lube oil level is topped up
2. Ensure over speed trip override switch set up to rough sea setting
3. Ensure reduced speed setting to prevent overload
4. All of the above

ANS.: D

22. Subsequent to a oil spill in Engine Room and ingress of oil in the bilge wells ,the best course of action is to ________________

1. Use oil spill dispersant chemical in the bilge wells
2. Transfer the oily mixture and let it settle in the bilge holding tank/bilge separator tank
3. Transfer the oily mixture using a portable pneumatic pump to a waste oil tank and then physically demark and clean the bilge wells using environment friendly cleaner
4. Dilute the bilge wells by flooding with water and then use the general service pump to pump out the bilges

ANS.: C

23. In case of an exhaust gas boiler fire ,which of the following is a suitable control measure?

1. Start frequent soot blowing
2. Increase main engine speed to blow away the soot particles on fire
3. Stop cooling water circulation to avoid leakage
4. None of the above

ANS.: D

24. Refractory damage in boiler furnace onboard is caused due to

1. Presence of moisture in the boiler before startup
2. Rapidly fluctuating temperatures inside boiler furnace
3. Overheating of boiler tubes due to lack of heat transfer from tubes due to scale
4. Boiler panting and vibrations

ANS.: A,B,D

25. An economizer uptake fire in the engine room is extinguished by

1. Boundary cooling of the uptake
2. Injecting fixed fire fighting system if provided
3. Injecting water from the uptake
4. None of the above

ANS.: A,B

26. LNG STORAGE AND PUMPING DETERMINED BY WHAT PROPERTY
    1. VAPOUR PR
    2. PARTIAL VPR PR
    3. FLASH POINT
    4. POUR POINT

ANS.: A