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OTCTO Exit Exam Questions and Answers 2024, Exams of Water and Wastewater Engineering

Indiana University EastWater and Wastewater Engineering

OTCTO Exit Exam Questions and Answers 2024

Typology: Exams

2023/2024

Available from 04/09/2024

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OTCTO Exit Exam Questions and Answers 2024
1. When the IG plant is shutdown, the IBC cooling water should be let on the scrubber for at least
hour(s)
a) 1
b) 2
c) 3
d) 4
2. What are consequences of a high oxygen content alarm sound during normal operation?
a) The plant is shut down
b) The pressure control valve and the flue gas isolating valve will automatically close
c) The alarm in Ccr will sound loud and the plant will auto stop
d) The deck demand valve will automatically close. The atmosphere purge valve will open and the
furnace presser control valve will regulate.
3. What are these types of tanker:-LR1 (large range 1)
a) 25,000-49,999DWT
b) 50,000-79,999 DWT
c) 80,000-159,999 DWT
d) None Of The Above
4. The petroleum remaining after the removal of products such as methane is termed
a) Crude oil
b) Diesel oil
c) HFO
d) None Of These
5. PROTECTION for acetylene & oxygen line flame arresters & N/R flow back valves are for
a) Carrying out gas welding & acetylene gas cutting work
b) Protection of personnel from high temp.
c) Preventing sparks from entering a tank or vent opening
d) Fire fighting
6. In case of P/V valve for one tank is not working and the tank pressure is rising, what immediate
actions are necessary usually set to follow?
a) Abort filling that individual tank
b) Try to open the valve manually
c) Isolate the line and change the valve from vessels tested spare
d) Follow all the procedures (A) + (B) &(C)
7. Which topic is not required to be discussed at the pre- transfer conference?
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OTCTO Exit Exam Questions and Answers 2 024

  1. When the IG plant is shutdown, the IBC cooling water should be let on the scrubber for at least hour(s) a) 1 b) 2 c) 3 d) 4
  2. What are consequences of a high oxygen content alarm sound during normal operation? a) The plant is shut down b) The pressure control valve and the flue gas isolating valve will automatically close c) The alarm in Ccr will sound loud and the plant will auto stop d) The deck demand valve will automatically close. The atmosphere purge valve will open and the furnace presser control valve will regulate.
  3. What are these types of tanker:-LR1 (large range 1) a) 25,000-49,999DWT b) 50,000-79,999 DWT c) 80,000-159,999 DWT d) None Of The Above
  4. The petroleum remaining after the removal of products such as methane is termed a) Crude oil b) Diesel oil c) HFO d) None Of These
  5. PROTECTION for acetylene & oxygen line flame arresters & N/R flow back valves are for a) Carrying out gas welding & acetylene gas cutting work b) Protection of personnel from high temp. c) Preventing sparks from entering a tank or vent opening d) Fire fighting
  6. In case of P/V valve for one tank is not working and the tank pressure is rising, what immediate actions are necessary usually set to follow? a) Abort filling that individual tank b) Try to open the valve manually c) Isolate the line and change the valve from vessels tested spare d) Follow all the procedures (A) + (B) &(C)
  7. Which topic is not required to be discussed at the pre- transfer conference?

a) Estimated time of finishing cargo b) Details of transfer and receiving system c) Emergency shutdown procedures d) Identity of the product to be transferred

  1. Example of inorganic chemicals as: a) Sulphuric acid b) Phosphoric acid c) Nitric acid d) All of the above
  2. Clean ballast is normally a) Ballast water loaded directly into a cargo tank after discharge b) Ballast water into cargo tanks which have been crude oil washed c) Ballast water loaded into cargo tanks which have been crude oil and water washed d) Ballast water loaded in designated tanks used only for that purpose
  3. During loading operation ullage and temp measuring equipment is showing low battery which place can we replace battery a) Can be replaced on tank area b) Can be replaced near manifold area c) Can be replaced at pump room entrance d) Can be replaced only inside accommodation
  4. Vessels in clean service normally do not have or need heater coils as the viscosity of the clean product is low enough to permit easy pumping at atmospheric temps. a) Applies to all clean petroleum product ( CPP ) b) With the exception of some lube oils & special vegetable oils c) Applies to all chemicals d) Applies to all condensates
  5. The foam system is operated from the room a) CCR b) ECR c) FGFC d) All the above
  6. MARPOL Annex VI applies: a) Only the ships that fly the flag of a state that is party to MARPOL annex VI b) Only to ships that visit ports of a state that is party to MARPOL annex VI c) To ship with both of the above d) All ships irrespective of flag or port state control requirements

c) Ballast water from a different origin d) All the above (A) , (B) and (C)

  1. While the vessels is in a Red sea port during loading/discharging a hydrocarbon cargo, should air suction for the accommodation be: a) Closed down all together b) Recirc full open fresh air intake closed c) A mixture of both d) Placed on full recirculation
  2. Why the carriage and usage of hand gas lighters are prohibited on board oil and chemical tankers. What is alternative means for lighting a fire. a) Intrinsically safe lighters are used to test the heat & flame detectors. b) Safety igniters are used for lighting up gas torches before hot work c) Safety matches are available to used in designated smoking area d) Both the points (A) and (C)
  3. The IG blower should be capable of maintaining a positive pressure of mm WG minimum in the cargo tanks regardless of the tank combination for discharging a) 100 b) 200 c) 300 d) 400
  4. What are the necessary conditions that must take place for an electrical discharge [ spark ] to occur? a) Electrostatic separation b) Electrostatic accumulation c) Electrostatic discharge d) All the above
  5. In enclosed space, declared gas free further gas may be released a) After loose scale and sludge are disturbed b) When oxygen level become reduced c) When water is loaded into the cargo tank d) When the temp of the sea water rises
  6. The prime mover of deep well pump is usually an motor. a) Electric b) Hydraulic c) Pneumatic d) Electric or hydraulic
  1. How is sea water supplied to the deck seal? a) Through the deck fire line b) Through the main sea water pump or the cargo condenser pump c) Through the deck seal pump fitted in the engine room d) Through a sea water aggregrate pump fixed on the cargo deck
  2. Operation of educator what is correct? a) Continuous checking suction pressure b) According to the specific educators performance curve c) Min 8 bar drive pressure and high back pressure d) Min12 bar drive pressure
  3. If you changed the set point of relief valve where would you made a record of the change? a) Personal record book b) Cargo record book c) Ships log d) Engine room log
  4. Material for IG blower casing is a) Mild steel b) Stainless steel c) Cast steel d) Cast iron
  5. Inert gas after leaving the demister will consist the following a) Oxygen less than 5% b) SO2 less than 2.0% c) Water vapour 1% d) Both A & B
  6. How much volume of air needs to be changed in pump room a) 10 vol/hr b) 25 vol/hr c) 20 vol/hr d) 15 vol/hr
  7. Fixed foam monitors having a operating capacity L/min a) 1250 b) 1450 c) 1150 d) 1650
  1. Before cargo operations start the master should establish liaison between the ship and a) The terminal b) The flag state administration c) The port authority d) The harbour control
  2. If at sea the inert gas low pressure alarm is activated it may be necessary to conduct a) Cargo heating operations to raise the pressure b) Cargo transfer operation to raise the pressure c) Inert gas topping up operations d) Reduce engine speed to allow safe ingress of atmospheric air
  3. When oil temperature rises, the volume a) Varies b) Reduces c) Increases d) Remain the same
  4. An important publication required to be approved by the flag state and carried onboard chemical tankers a) The procedure and arrangements manual b) The operation manual c) The arrangements manual d) The procedures manual
  5. The low velocity fog applicator used in conjunction with the all purpose fire fighting nozzle, should always be a) Stored in the rack when not in actual use b) Attached to the nozzle by the chain c) Coated with heavy grease to prevent corrosion d) Left in place in the all – purpose nozzle
  6. Which safety device is fitted on the inert gas scrubber tower to monitor the efficient operation of the plant? a) The inert gas low flow alarm b) The scrubber tower high level alarm c) The scrubber tower low pressure & non flow alarm of cooling tower d) Both (B) & (C)
  7. In IG plant, prior starting switch on the oxygen analyzer at least hours before start up. a) 2 b) 3

c) 4 d) 5

  1. Start up the scrubber tower cooling water pump and put water onto the scrubber mins before starting the blowers a) 90 b) 15 c) 60 d) 45
  2. Start the blower at minutes before IG is required by the deck operators. a) 30 b) 90 c) 15 d) 45
  3. When loading by gravity the last valve to be opened should be a) Shore tank valve b) Ships manifold valve c) For the cargo tank to be loaded into d) The ships drop line valve
  4. Any hawser by which a vessel is secured to a dock or mooring. It may be made of natural materials (manila), synthetics, (polypropylene), or wire. Under certain circumstances the anchor chain is detached from the anchor and a section of that is used to secure the vessel a) Breast line b) Spring line c) Heaving line d) Mooring line
  5. Temperature control of cargoes means a) Applying heat in a controlled manner b) Allowing the cargo to adopt ambient temps. c) Allowing the cargo to heat naturally d) Monitoring the cargo temp.
  6. The narrow, empty space between two adjacent watertight or oil tight compartments. This space is designed to isolate the two compartments from each other and / or provide additional buoyancy. This space is called a) Void tank b) Buoyancy tank c) Reserve fuel tank

a) Master b) 2 nd^ /off c) Loading /berth master d) CH/off

  1. In the event of cargo spillage, which of following would be informed first? a) The clean up contractor b) The agent c) The ship owner d) The port authority
  2. One of the requirements for the crude oil washing on tankers is that an inert gas system be fitted, according to regulations supply of an inert gas system can be have portable connection to which space other than cargo tank? a) Every cargo tank b) Every cargo and slop tank and cofferdam c) Every cargo and slop tank d) Every cargo tank, slop tank, cofferdam and ramp space
  3. High IG temperature trip is about a) 55C b) 65C c) 85C d) 75C
  4. The flammable range of different chemicals may be a) Always the same b) The same c) Often different d) Always different
  5. The apparatus consist of double opposed nozzles which rotate slowly about their horizontal and vertical axis and project two streams of water through all possible angles against all inside surfaces of the space being cleaned. a) Crude oil washing machines b) Butterworth tank cleaning machine c) Manually operated deck tube nozzle machine d) All of the above ( A) (B) (C) or combinations of attachment
  6. Pyrophoric iron sulphide is formed: a) In the presence of oxygen b) In presence of H2S

c) When rust is formed in tanks d) All of the above

  1. It is lowest liquid temperature at which the small flame initiates a flash of flame across the surface of the liquid, there by indicating presence of flammable gas above the liquid a) Pour point b) Flash point c) Cloud point d) None of the above
  2. What does ODME means a) Oil detecting – master evaluating b) Over board detecting measure equipment c) Oil detection measure equipment d) Oil discharge monitoring equipment
  3. Which of the following is compulsory on ships fitted with inert gas? a) No smoking is allowed in any place at all on the vessel b) an entry permit is required each time a person enters the pump room for any reason c) Notice is to be placed at entrance as required NO ENTRANCE WITHOUT PERMISSION OF RESPONSIBLE PERSON (C / O ) inert gas d) Three (3 ) breathing apparatus sets with spare bottles and a refilling compressor Is fitted in the forecastle
  4. All VLCC normally has cargo tank heating arrangement as a) Heating steam arrangement in the individual tanks by steam circulation b) Deck heaters electrically heated for circulation through heaters c) Deck steam heater heated by steam circulation d) None of the above
  5. is considered as best material for IG blower impellers a) Chromium b) Steel c) Titanium d) Aluminium
  6. IG blowers are to be fitted with inlet and outlet valves in gas line with seats a) Copper b) Aluminium c) Leather d) Rubber
  7. There is an isolated fire on the poop deck, where should the master take control from?

d) Loaded with caution

  1. A cargo educator casing normally made of which of the following material? a) Phosphor bronze cast b) Specially made cast steel c) Cast iron d) Stainless steel
  2. What types of ships are commonly known as pre-MARPOL tankers? a) A ship which do not comply with the requirements for protectively located segregated ballast tank b) A category 2 oil tanker c) A ship which do comply with die requirements for protectively located segregated ballast tank d) A category 3 oil tanker
  3. What is the meaning of non-volatile cargo a) Flash point below 65 c b) Flash point above 60 c c) Flash point above 65 c d) Flash point below 60 c
  4. When discharging a tanker, how can list be control? a) By shore side personnel b) By using the after peak tank, loading as necessary c) By using wing tank near the longitudinal center , discharging as necessary d) By using a center tank near the bow , discharging as necessary
  5. Which of these valves will be cycled from fully open to fully closed when the angle is turned 90 a) Butterfly valve b) Check valve c) Globe stop valve d) Gate valve
  6. The frequency of pressure testing ashore of BA sets should as a maximum be every a) 10yrs b) 6yrs c) 5yrs d) 15yrs
  7. such as petrol (motor spirit ) and diesel oil tend to be liquid under normal atmosphere a) Very light molecules b) Very heavy molecules

c) Intermediate molecule d) None of these

  1. The allowable time specified in the charter party for vessels loading or discharging of cargo a) Lay time b) Specified loading time c) Maximum allowed loading time d) Charter party loading time
  2. When discharging a double hulled tanker, the discharge plan must take into account a) A discharge rate is that too fast b) A discharge rate is too slow c) Crude oil washing and discharging simultaneously d) Inerting is adequate with respect to discharge
  3. Fixed foam monitors having a nozzle rotation angle of degree a) 180 b) 270 c) 360 d) 240
  4. During cargo operation or whenever dangerous vapour may be present on deck a) All accommodation doors and windows should be open to allow vapour to dissipate b) Immediately cease all cargo operations c) Hoist flag bravo d) Keep closed all ports and windows which are facing the cargo area Q. What is the minimum distance from the forward division of the accommodation for accesses to the accommodation? a) 1 metre b) 3 metre c) 4 metre d) 2 metre Q. What is the general requirement for closing mechanism for in and outlets of all ventilation systems (ships other than passenger ships carrying more than 36 passengers)? a) Only manually closing mechanism allowed b) To be remotely controlled from central fire control panel c) Closing must be possible from outside the spaces being ventilated d) Automatic closure for each section to be activated by the detection and alarm system

d) All the above

  1. To discharge the last amount of cargo ashore, the stripping pump through the small diameter line is used from cargo tanks. Where does this small diameter line come from in the pump room? a) From the individual stripping line to the stripping pump. b) From the tank suction line to the Main cargo oil pump. c) From the cargo pump suction pipe line to the stripping pump. d) From the cargo pump discharge line to the stripping pump.
  2. The term solubility refers to the ability to mix with a) Oil b) Air c) Water d) Other liquids
  3. Fixed foam monitors having a maximum capacity of L/min a) 4400 b) 5500 c) 6600 d) 7700
  4. Cargo tanks are not with IG before gas freeing then the concentration of atmosphere will pass through flammable range a) Crude oil washed b) Purged c) Tank cleaning d) Re-inerting
  5. In scrubber is readily absorbed by water a) SO b) SO c) SO d) SOx
  6. Inert gas system has scrubber tower in a flue gas from boiler flue gas type of system. What is the arrangement for a separately fired inert gas Generator? a) The IG Generator also has scrubber tower combined with the furnace. b) The IG Generator can also have separate scrubber tower. c) The separately fired IG Generator does not have a scrubber tower. d) Conditions (A) and (C) are suitable.
  7. Why CO2 is not used as an inert gas

a) More denser b) Have more conductivity c) Have intense electro-static field d) None of the above

  1. An inert gas is one which has little or no ability to react with other gases, or to heat. Examples of Inert gases are nitrogen and CO2. Shipboard inert gas systems utilize CO2, either from flue gas sources or from inert gas generators. a) True b) False
  2. Submerged cargo pumps cofferdam leakage is tested by the following intervals a) Every 6 monthly b) Every 12 monthly c) Every monthly d) Every monthly & suitably after every operation of discharge/ballasting.
  3. Who should tank cleaning operations be supervised by? a) Shore representative b) Pump man c) Deck Officer d) Responsible Officer
  4. Which of the following terms is used to identify the pressure of the liquid entering a pump? a) Suction head b) Discharge head c) Total Pump head d) Pump RPM
  5. In theory, a cargo pump should be able to draw up a liquid to a height equalling atmospheric pressure. This would be approximately a) 30 metres b) 15 metres c) 5 metres d) 10 metres
  6. Separate CO2 system comprises of 4 cylinders that are manually operated, is there for a) IG fan room b) Emergency generator room c) Incinerator room d) All the above

d) 17

  1. The main inert gas distribution line on deck is provided with one or two a) Gauge glass to monitor the presence of liquid b) Flow meter c) PV breaker d) Fixed oxygen content analyser
  2. Internally lined deck seal shells should be fitted with a _ in the way so the steam heating pipe entering the shell a) Drain valve b) Steam trap c) Heat sink d) All the above
  3. While discharging cargo if the oxygen content within the inert gas main is above the SOLAS 1974 recommendations and the Engine Room inform you that they cannot reduce it, what would your actions be? a) Continue with cargo operations b) Call the Chief Engineer and continue with cargo operations c) Stop all cargo operations d) Call the Master and continue with cargo operations
  4. Depending upon the temperature rise across the blower this could result in over kg of salts being deposited onto the blower internals over a 24 hour period a) 7 b) 8 c) 5 d) 9
  5. What does code R stand in ship shore safety checklist a) Remarks b) Request c) Require d) Re-checked
  6. Black oils are generally a) Static accumulators b) Static non- accumulators c) Both d) None of the above
  1. The gas regulating valve should be opened very slowly in order to avoid: a) Back flow gas b) Water carry over c) Noise d) Vibrations
  2. In crude oil tankers, the gas detectors installed should be a) Correct electrical classification b) Weather proof c) Corrosion resistant d) All of the above
  3. If the flash point of an oil cargo is 580 C, it is said to be a) Volatile b) Non-volatile c) Toxic d) None of the above
  4. Which are the basic safety device fitted on the deck inert gas line to monitor the supply condition of the inerted tanks and pipelines of supply of gas? a) The inert gas low pressure alarm b) The inert gas high temperature alarm c) The inert gas low flow alarm d) All the above (A), (B) and (C)
  5. Which of these is a positive displacement pump? a) Gear b) Reciprocating c) None of the above d) Both (A) and (B)
  6. What is the purpose of a “part flow system” installed on some oil tankers? a) The Part Flow system makes it possible to discharge dirty ballast below the water line on older tankers. b) The Part Flow system makes it possible to observe the discharge visually for oil content, on older tankers with discharge below the waterline. c) The Part Flow system makes it possible to observe the discharge visually for oil content,even in darkness. d) The Part Flow system makes it possible to measure the oil content, even if the Oil Discharge Monitoring Equipment is not working.
  7. Who should attend during connection of cargo oil transfer arms/hoses