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TASCO exit exam questions and answers — Set 5

Set 5 of the Advanced Training for Oil Tanker Cargo Operations (TASCO) exit exam bank — 30 of 181 questions, with the correct option marked and a one-line explanation for every one. Read it end to end, jump to a single set, or search it — then sit the same bank as a timed paper. The real DG Shipping exit exam is 30 marks with 15 to pass.

These are the bank's original groupings. Practising deals the whole bank out again every time you reshuffle, so a practice “Set 3” is a different 30 questions each time — the set numbers below are the source file's, and are only used here so the key stays navigable. Options are listed in their original order with fixed letters; when you practise, those move too.

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Set 5 — 30 TASCO exit exam questions with answers

1. Cargo tank fill alarm indicator panels:

  • A. are normally fitted on the bridge and sometimes in the engine control room
  • B. are normally fitted in the cargo control room and sometimes on deck
  • C. are normally fitted on the bridge and sometimes on deck
  • D. are normally fitted in the engine control room and sometimes on deck
Answer: B — are normally fitted in the cargo control room and sometimes on deck
Cargo tank high-level and overfill alarms are critical safety instruments; they are typically monitored in the Cargo Control Room (CCR) where the transfer is being managed, with local alarms often provided on deck.

2. Identify the equipment in the IG system correctly:

  • A. 1-O2 Analyzer; 2-Demister; 3-Air Intake-Gas Freeing; 4- Regulating Valves; 5- Blowers
  • B. 1- Demister; 2-O2 Analyzer; 3-Regulating Valves; 4-Air Intake-Gas Freeing; 5- Blowers
  • C. 1- Demister; 2-O2 Analyzer; 3 - Blowers; 4- Regulating Valves; 5- Air Intake-Gas Freeing
  • D. 1- Demister; 2-O2 Analyzer; 3-Air Intake-Gas Freeing; 4- Regulating Valves; 5- Blowers
Answer: D — 1- Demister; 2-O2 Analyzer; 3-Air Intake-Gas Freeing; 4- Regulating Valves; 5- Blowers
The standard IG system flow path includes the scrubber (demister), blowers, O2 analyzer, regulating valves for flow control, and air intake for gas freeing, arranged to ensure clean and safe delivery of inert gas.

3. Working instructions specifying the manner in which the ship is to be loaded and ballasted to avoid unacceptable stresses in the vessel's structure is required for tankers:

  • A. Greater than 75 meters in length
  • B. Greater than 100 meters in length
  • C. Greater than 150 meters in length
  • D. Greater than 50 metres in length
Answer: C — Greater than 150 meters in length
Regulation regarding structural integrity and loading calculations for tankers requires that ships over 150 meters in length carry specialized loading instruments and documentation to monitor shear forces and bending moments.

4. A self-contained breathing apparatus is used to

  • A. determine if the air in a tank is safe for men
  • B. resuscitate an unconscious person
  • C. enter areas that may contain dangerous fumes or lack oxygen
  • D. make underwater repairs to barges
Answer: C — enter areas that may contain dangerous fumes or lack oxygen
Self-contained breathing apparatus (SCBA) is essential personal protective equipment (PPE) for entering hazardous environments where the atmosphere may be oxygen-deficient or contaminated with toxic cargo vapours.

5. Identify correct labelling for Tanker VEC

  • A. 1- P/V Valve; 2- Mast Riser; 3- P/V Breaker; 4 - Deck water seal
  • B. 1- P/V Valve; 2- P/V Breaker; 3- Deck water seal; 4- Mast Riser
  • C. 1- P/V Valve; 2- P/V Breaker; 3- Mast Riser; 4 - Deck water seal
  • D. 1- Mast Riser; 2- P/V Breaker; 3- P/V Valve; - Deck water seal
Answer: A — 1- P/V Valve; 2- Mast Riser; 3- P/V Breaker; 4 - Deck water seal
In a standard tanker VEC (Vapour Emission Control) system configuration, the sequence involves the P/V valve (pressure regulation), Mast Riser (venting), P/V Breaker (vacuum protection), and the deck water seal as the primary flame arrestor.

6. Part A of the the ISGOTT Ship/Shore Safety Check-List provides operational procedures for:

  • A. Transfer of bulk liquids - elements to be verified verbally
  • B. Additional considerations for Bulk Liquefied Gases
  • C. Additional considerations for Bulk Liquid Chemicals
  • D. Transfer of bulk liquids, physical checks
Answer: D — Transfer of bulk liquids, physical checks
Part A of the ISGOTT Ship/Shore Safety Check-list is designated for physical verification of safety measures. It ensures that critical items, such as hose connections and bonding, are checked manually before cargo transfer commences.

7. The approval period for a shipboard Oil Pollution Emergency Plan expires after

  • A. five years
  • B. four years
  • C. two years
  • D. three years
Answer: A — five years
The Shipboard Oil Pollution Emergency Plan (SOPEP) is a mandatory requirement under MARPOL Annex I, Regulation 37. It must be reviewed and updated regularly, with approval typically valid for a five-year cycle to align with the ship's safety management system and periodic surveys.

8. Which of the listed functions is the purpose of a gas scrubber in an inert gas generation system?

  • A. Cools the inert gas.
  • B. Maintains the oxygen content at 5% by volume.
  • C. Bleeds off static electricity in the inert gas.
  • D. Maintains flow to the water seal on the gas main.
Answer: A — Cools the inert gas.
In an Inert Gas System (IGS), the gas scrubber is essential for cooling the hot exhaust gases from the boiler or inert gas generator using water. It also performs the critical function of removing sulfur oxides and soot particles from the flue gas.

9. With an increase in temperature the volume of flammable and combustible liquids

  • A. contracts
  • B. expands
  • C. remains constant
  • D. remains constant if pressure remains constant
Answer: B — expands
Flammable and combustible liquids possess a coefficient of thermal expansion, meaning their volume increases as temperature rises. This physical property necessitates the implementation of ullage spaces in cargo tanks to prevent over-pressurization due to thermal expansion.

10. The standard unit of liquid volume used in the petroleum industry, as well as the tanker industry, is a __________.

  • A. liter
  • B. barrel
  • C. gallon
  • D. drum
Answer: B — barrel
In the global petroleum and tanker industry, the standard unit of measurement for volume is the barrel. One barrel is equivalent to 42 US gallons, providing a standardized basis for cargo calculations, bill of lading documentation, and commercial trading.

11. Combustible gas indicators operate by drawing an air sample into the instrument

  • A. where its specific gravity is measured
  • B. where it is ignited by a sparking device
  • C. where it is mixed with nitrogen
  • D. over an electrically heated platinum filament
Answer: D — over an electrically heated platinum filament
Combustible gas indicators (explosimeters) utilize a Wheatstone bridge circuit. An air sample is drawn over an electrically heated platinum filament; the combustion of flammable gas on the filament increases its temperature and resistance, which is then measured and displayed as a percentage of the Lower Explosive Limit (LEL).

12. Each ship having an inert gas system must have a portable instrument to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure

  • A. oxygen
  • B. carbon dioxide
  • C. nitrogen
  • D. water vapor
Answer: A — oxygen
Ships with an inert gas system are required to maintain portable monitoring equipment to verify the atmosphere within cargo tanks. This must include an oxygen analyzer to ensure the oxygen content is maintained below the critical limit (typically 5% or 8% by volume) to prevent combustion.

13. As required by Reg.31 of Annex 1 of Marpol the ODMCS should be provided with a recording device for recording the discharge in litres per nautical mile and total quantity discharged. This discharge should be kept onboard at least for a period of

  • A. Continuous, 3 years
  • B. Continuous, 1 year
  • C. Intermittent, 1 year
  • D. Intermittent, 3 years
Answer: A — Continuous, 3 years
MARPOL Annex I, Regulation 31 requires the Oil Discharge Monitoring and Control System (ODMCS) to have a recording device to track discharges. These records must be preserved for at least three years to be available for inspection by Port State Control or Flag State authorities.

14. After each reading of an oxygen indicator, the instrument should be purged with

  • A. fresh air
  • B. CO2
  • C. the tested compartment's air
  • D. water
Answer: A — fresh air
To ensure accuracy and prevent sensor damage or 'memory effects' from previous samples, the oxygen indicator must be purged with fresh ambient air. This restores the sensor to the baseline atmospheric oxygen concentration (approx 20.9%) before the next measurement.

15. When the cofferdam to be purged to check the leakage and remove the leaked oil?

  • A. Before starting the cargo operation
  • B. Before starting the cargo operation and after the cargo operation is completed
  • C. After the cargo operation is completed
  • D. During the cargo operation
Answer: B — Before starting the cargo operation and after the cargo operation is completed
Cofferdams adjacent to cargo tanks must be purged and checked before cargo operations commence to ensure no leakage is present, and again after completion to verify the integrity of the bulkheads during the operation. This is a vital practice for preventing pollution and fire hazards.

16. What does "I" stand for in the centrifugal pump diagram?

  • A. Shaft
  • B. Impeller
  • C. Diffuser
  • D. Eye (Suction)
Answer: A — Shaft
In standard centrifugal pump diagrams, the central rotating component supported by the bearing housing that transmits power from the motor to the impeller is referred to as the shaft.

17. The area indicated by the number "III" in the pump diagram is known as the

  • A. Cargo Purging Connection
  • B. Local Control Valve
  • C. Speed Torque Control Valve
  • D. Cofferdam Purging
Answer: C — Speed Torque Control Valve
In a cargo pump hydraulic system diagram, section 'III' usually denotes the control valve assembly. This valve regulates the flow and pressure of the hydraulic oil to the hydraulic motor, thereby controlling the speed and torque of the pump.

18. How the Framo pump has almost eliminated cavitation for free flowing liquids?

  • A. Volute casing is designed in such a way, that its smoothness avoids cavitation
  • B. The hydrofoil design of the curved vanes, eliminate cavitation
  • C. Since the suction pipe is eliminated, cavitation is also eliminated for liquids with free flow
  • D. The backwards curved vanes eliminate the cavitation
Answer: C — Since the suction pipe is eliminated, cavitation is also eliminated for liquids with free flow
Framo submerged cargo pumps eliminate the suction pipe by being placed directly at the bottom of the cargo tank. By removing the long, tortuous suction piping, the pressure drop is minimized, effectively preventing cavitation for free-flowing liquids.

19. Select the correct statement regarding pressure.

  • A. The water reservoir of a self-priming pump may be at the back of the impeller.
  • B. Dynamic pressure is a function of the fluid velocity and its density.
  • C. Pressure type vacuum valves can prevent Backflow.
  • D. Stripping pumps are not of the self-priming type.
Answer: B — Dynamic pressure is a function of the fluid velocity and its density.
Bernoulli's principle establishes that dynamic pressure is directly related to the density of the fluid and the square of its velocity. This relationship is fundamental to understanding pump head, flow velocity, and pressure energy conversion within the pump casing.

20. How portable pumps are used?

  • A. Potable pumps are used in parallel with the main Framo pump to discharge the tank in a short time
  • B. When main pump is not working, the portable pump is used to transfer the cargo from this tank to another empty tank, where the main pump is working
  • C. When main pump is not working, portable pumps are used to discharge the liquid cargo to the terminal
  • D. Potable pumps are used in series with the main Framo pump to discharge the tank with large pressure.
Answer: B — When main pump is not working, the portable pump is used to transfer the cargo from this tank to another empty tank, where the main pump is working
Portable pumps are primarily used as emergency or backup equipment. If a fixed main cargo pump fails, a portable pump can be lowered into the tank to facilitate cargo transfer to another tank where a functioning main pump can then discharge it to the terminal.

21. What does "II" indicate in the pump diagram?

  • A. Impeller
  • B. Diffuser
  • C. Eye (Suction)
  • D. Shaft
Answer: C — Eye (Suction)
The eye of a centrifugal pump is the central inlet point where the fluid enters the pump impeller. It is the area of lowest pressure, and its design is crucial for preventing cavitation.

22. Which number represents the Hydraulic Motor in the pump cross-section illustration?

  • A. III
  • B. I
  • C. IV
  • D. II
Answer: B — I
In a cross-section illustration of a submerged cargo pump, 'I' typically marks the hydraulic motor section. This motor is powered by the vessel's hydraulic system and drives the impeller directly.

23. The part "IX" in the centrifugal pump diagram indicates

  • A. Packing
  • B. Stuffing Box
  • C. Casing
  • D. Shaft Sleeve
Answer: A — Packing
In a pump assembly diagram, 'IX' identifies the packing or mechanical seal arrangement. These components are critical for preventing cargo leakage from the pump into the hydraulic motor section or the engine room.

24. From the pump illustration, identify the part marked - "IV".

  • A. Impeller
  • B. Anti-rotation Brake
  • C. Volute Casing
  • D. Hydraulic Motor
Answer: C — Volute Casing
In a typical cargo pump diagram, the volute casing refers to the spiral-shaped housing surrounding the impeller. It is designed to convert the kinetic energy of the fluid (velocity) into pressure energy as it moves toward the discharge nozzle.

25. How vacuum drain is done in Framo pumps?

  • A. vacuum drain is part of the pump casing
  • B. Vacuum is created in the stripping line to pump the cargo out to make the well dry
  • C. Vacuum drain is used to check leakage in pump's cofferdam
  • D. Pump has a different vacuum line which is connected to the cargo tank well; vacuum pump is used to suck the oil out to make the well dry
Answer: D — Pump has a different vacuum line which is connected to the cargo tank well; vacuum pump is used to suck the oil out to make the well dry
Framo cargo pumps utilize a specialized vacuum drain line connected to the tank well. By applying a vacuum, the system can clear the remaining cargo from the well even when the main pump has lost suction due to low levels.

26. Why the cargo pump in the Framo cannot be overloaded?

  • A. The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, the pump runs at the optimum speed
  • B. The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, the pressure can run the pump at 75% of the capacity
  • C. The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, when the pump over speeds, the flow of oil is reduced
  • D. The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, the flow is always kept constant
Answer: A — The pressure of hydraulic oil to the motor driving the cargo pump is designed in such a way that, the pump runs at the optimum speed
Framo pumps are designed with an integrated hydraulic control system that matches the power delivery to the load. By maintaining optimum speed and preventing excessive power draw, the pump system prevents mechanical overloading of the components.

27. What does figure "V" represent in the centrifugal discharge diagram?

  • A. None of the above
  • B. Vane
  • C. Discharge nozzle
  • D. Eye of impeller
Answer: C — Discharge nozzle
In a centrifugal pump, the fluid is accelerated by the impeller and forced into the discharge nozzle. This component guides the fluid out of the pump casing into the main cargo piping system.

28. Normally how much hydraulic oil is required to run the Framo portable pump?

  • A. 140 litres per min
  • B. 360 litres per min
  • C. 90 litres per min
  • D. 250 litres per min
Answer: A — 140 litres per min
Framo portable pumps are specifically rated for hydraulic flow requirements to achieve their design performance. For standard portable pumps, this requirement is typically 140 liters per minute of hydraulic oil.

29. Select the correct statement regarding operation of the portable pumps?

  • A. Ensure that only the lower half of the pump is submerged and is lowered as the cargo level falls.
  • B. Make sure that the portable pump is completely submerged and lowered till the bottom of the tank and then start the pumping operation
  • C. Before using portable pump, rig the pump on the deck and while pumping, lower the hose in the tank
  • D. When the liquid cargo level goes down, lower the hose accordingly, keeping the rigged pump on the deck
Answer: A — Ensure that only the lower half of the pump is submerged and is lowered as the cargo level falls.
During operation, the portable pump must be lowered as the liquid level drops to maintain suction. Submerging only the lower half ensures the intake remains flooded while preventing the pump from resting on bottom sediments that could clog it.

30. What is the pressure of the hydraulic oil in the return side after running the hydraulic motor?

  • A. Above 15 bar
  • B. Around 15 bar
  • C. Around 10 bar
  • D. Around 3 Bar
Answer: D — Around 3 Bar
In a closed-loop hydraulic system, the return pressure must be kept low to ensure efficient operation of the hydraulic motor. A pressure of approximately 3 bar is standard for the return side of these systems.

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