MEO CLASS IV MEP QUESTIONS AND ANSWERS
MEO CLASS IV exam is conducted by DG SHIPPING govt. of India. Below is the list of questions most frequently asked in meo class 4 MEP ( Marine engineering practice ) exam.
Precaution is taken to give all correct answers at the same time author is not responsible for any mistakes whatsoever.
These class 4 MEP questions and answers can be considered as a reference guide for your class 4 written exam.
MEO CLASS IV MEP QUESTIONS AND ANSWERS
You have overhauled a centrifugal pump and while assembling forgot to install the o- ring between the sleeve (provided in way of gland packing) and the shaft. What impact does this have?
A. It will not affect the pump in any way
B. It will cause leakage of fluid(air/water) in between the shaft and the sleeve and will affect the pump performance *
C. It will not affect the pump performance n any way but will corrode the shaft between the o-ring and shaft
D. It will cause dynamic imbalance of the shaft
Which of the following types of boiler burners have maximum turn down ratio? (Y-jet, 20:1)
A. Pressure jet type
B. Spinning cup burner
C. Spill type burner
D. Y-jet type burner *
Copper tubing is used in Refrigerant system because
A. It has less internal resistance
B. It is cheaper compared to other materials
C. It is easier to check leaks in copper based system
D. None of the above *
Which of the following is a true statement? (Choose more than one option if true)
A. Mild steel will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte *
B. Stainless steel will be subject to preferential corrosion when in electrical continuity with Mild steel in presence of an electrolyte
C. Copper will be subject to preferential corrosion when in electrical continuity with Mild steel in presence of an electrolyte
D. Zinc will be subject to preferential corrosion when in electrical continuity with Aluminium in presence of an electrolyte *
F.O. transfer pump was working efficiently, but it stopped taking suction suddenly. There is a sounding of 6.0 m in the F.O. deep tank. The suction pressure gauge was renewed recently and is showing a positive pressure when pump is running, but Pump is not transferring any F.O. What is the most probable cause?
A. Pump is damaged and needs overhaul
B. Suction filter cover gasket might leaking
C. Pump relief valve might be leaking *
D. The pump suction pipeline is blocked
Motor stator winding badly contaminated by dirt, oil and grease should be cleaned by:
A. High pressure compressed air
B. Suction or vacuum cleaning
C. Brushing, spraying or immersion in an approved cleaning solvent *
D. Immersion in fresh water followed by drying
Aluminum being lower than zinc in galvanic series provides lesser protection to steel compared to the zinc coating. Which one of the following is a true statement?
A. Aluminum coating provides good corrosion protection compared that of zinc at elevated temperatures *
B. Zinc is always preferred over aluminum coating irrespective of the temperature of metal surface
C. Aluminum is never used as coating material
D. Aluminum reacts with steel , so cannot be used for coating steel
Which of the following statements is False about hydraulic jacks/tensioning tools?
A. The piston of the jack should be turned back by a certain degree after hand tightening to prevent easy removal after un tightening of the nut.
B. The piston of the jack should not be turned back after hand tightening during un tightening of the nut
C. The piston of the jack need not be turned back during tightening of the nut.
D. The hydraulic pressure need not be relieved during removal of the jack *
Which of the following can lead to premature failure of roller bearings?
A. Misalignment *
B. Contamination *
D. Over greasing *
Which of the following is NOT a true statement?
A. Butterfly valves are used for modulating flow and can be throttled
B. Globe Valves can be straight flow or angle flow type
C. Swing check valve will provide lesser resistance than same bore diameter globe type check valve
D. In a globe type valves, mechanical seals are used for providing sealing between the valve bonnet and the spindle *
When A/E stand by FO heater in use M/E is running the heater fuel inlet v/v open slowly
A. Sudden open of fuel inlet v/v pressurize and damage heater
B. Fuel oil inlet v/v vapour lock inside the heater and allow steam
C. Fuel oil inlet v/v cause drop in M/E fo pressure stand by heater is not pressurzed may by leave sudden change in engine load RPMD. * D.Heater leaking
Impingement corrosion is a
A. Physical action *
B. CHEMICAL action
C. Physical and chemical action
D. None of the above
Which of the following is NOT a correct point for sampling of system lube oil for on board or shore analysis?
A. Standpipes *
B. Purifier outlets *
C. Inlet or outlet of L. O. coolers
D. Tank drains *
In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel?
C. Shrinkage cracking
D. Slagging *
A thin layer of electrolyte trapped in a small pits on a metal surface, and remaining stagnant over a period of time, may cause:
B. Bimetallic corrosion
C. Crevice corrosion *
D. Corrosion fatigue
In case of tankers, the speed of cargo pumps is reduced while stripping, why?
A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reduced *
B. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reduced
C. To prevent the pump from over speeding if it loses suction *
D. Decreasing the speed increases the discharge head of the pump which is required to pump out the remaining cargo
A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing?
A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed
B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat *
C. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing
D. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat
Which of the following statements is False about cleanliness of electric motors?
A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat generated
B. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of a motor.
C. High-pressure dry compressed air cleaning is preferred over suction cleaning for stator windings. *
D. Dry compressed air at a high pressure can drive in dirt inside windings instead of removing them.
The attached vacuum pump of a ballast pump operates on the principle of a:
A. Centrifugal pump
B. Reciprocating pump
C. Gear Pump D. Vane Pump *
Surface preparation of steel surfaces, prior carrying out painting is important because (choose the best alternative):
A. Any rust and contaminant inclusions may cause local paint film breakdown *
B. Too much paint will be consumed if surface preparation is not carried out
C. Surface will be very rough if proper surface preparation is not carried out
D. Surface preparation deposits a chemical onto steel surface which reacts with paint film and causes
Increasing the rotational speed of a cargo pump the pump flow rate will:
A. Increase in direct proportion to the increase in speed *
B. Decrease in direct proportion to the increase in speed
C. Flow rate doesn’t depend upon speed
After maintaining correct discharge pressure, soon ceases to discharge water what are possible cause?
A. Pressure gauge wrong
B. Pump sucking air *
C. Discharge valve throttled
D. Casing wear ring is worn
The flow rate through a F.O. transfer pump will not be affected by which of the following factors?
A. Low F.O. temperature
B. Low sounding in F.O. tank
C. Internal leakage within the pump
D. Leaking discharge valve *
Which of the following valves are designed to have valve seat in pairs – one facing the inlet side and the other facing the outlet side within the valve body?
A. Butterfly valve *
B. Ball Valve
C. Globe Valve
D. Gate Valve
In Impressed Current Cathodic protection system, the current for cathodic protection is supplied by:
A. Use of sacrificial anodes
B. A low voltage D.C. supply *
C. A low voltage A.C. supply
D. 110 V A.C. supply
Which of the following can lead to short cycling or frequent cutting in and cutting out of a fridge compressor?
A. Dirty condenser
B. Air entrapped in refrigerant
C. High cooling water temperature
D. Grossly insufficient charge *
In a Sea Water cooled J.C.W. cooler, the most common cause for loss in cooling efficiency of the heater is:
A. Scale formation on J.C.W. side
B. Mud/silt deposits on J.C.W. side
C. Scale formation on S.W. side *
Cadmium coatings provide corrosion protection. Cadmium coatings are commercially carried out using which of the following methods:-
A. Metal Spraying
B. Electro-plating *
D. Metal diffusion
The machinery which is usually tested first once the ship reaches a dry dock is
A. Engine room crane *
B. Engine room lift
C. Gantry crane for engine room
D. All of the above
A recently completely overhauled Engine room bilge pump was working efficiently. Suddenly one day you find that the pump is not taking suction. You have tried priming with sea water but still the pump doesn’t take suction from any of the bilge wells or bilge tank. What could have gone wrong inside the pump? Choose the best alternative.
A. The bucket rings have worn out
B. The suction or discharge valve must have worn out and started leaking
C. The suction or discharge valve might be stuck in one position or some debris mighthave lodged itself in between the valve and the seat
D. Pump suction filter might be clogged *
The common term used for failure of metal and alloys in a corrosive environment, when subject to high stresses is known as:
A. Fatigue failure
B. Corrosion fatigue
C. Stress corrosion cracking *
D. Fretting Corrosion
Wheel operated butterfly valves are operated through a reduction gearbox. The Gear arrangement inside of gear box is of________type
A. Bevel Gear
B. Rack & Pinion Gear
C. Planetary Gear
D. Worm & Worm Wheel *
Cladding is the process used for:-
A. Protection of metal surfaces against corrosion *
B. Protection of metal surfaces against erosion
C. Protection of metal surfaces against cavitation erosion
D. Protection of metal surfaces impingement corrosion
Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?
B. Purifier outlets
C. Inlet or outlet of L. O. coolers *
D. Tank drains
Chromium is a nobler metal when compared to that of steel. In some marine applications Chromium is electroplated to the steel surfaces. Why?
A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected
B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces *
C. Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protection
D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant
Correct method of greasing a centrifugal pump bearing is:
A. To pump the grease until you feel high back pressure on the Grease pump
B. To pump the grease for 3-4 pumping strokes of Grease pump for each bearing
C. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. the drain plug should then be replaced
D. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug, until all the old grease is removed and new grease starts coming out of the drain, repeating same for each bearing. the drain plug should then be replaced *