Mentora Quiz Editor
VLEC Managment / Day 4 Revision - Cargo Tank Loading and Cargo Pumps
Back To Mentora Home
Open Mentora Quiz
Mentora quiz.json
{ "quizId": "day4_loading_and_pumps_revision", "courseId": "VLEC Managment", "title": "Day 4 Revision - Cargo Tank Loading and Cargo Pumps", "subtitle": "BSM Maritime Training Centre", "passPercent": 70, "version": "1.0", "date": "2026-03-17", "questions": [ { "id": 1, "topic": "Learning Objectives", "question": "Which topic is specifically listed as a Day 4 learning objective?", "options": [ "Propylene polymerization control", "Filling limit, loading limit, and reference temperature", "Boiler combustion tuning", "Fresh water generator maintenance" ], "answer": "Filling limit, loading limit, and reference temperature", "explanation": "The learning objectives explicitly include understanding filling limit, loading limit, and reference temperature." }, { "id": 2, "topic": "Pipeline Capacity", "question": "What is the stated maximum flow rate for a 16-inch liquid manifold on the VLEC loading table?", "options": [ "1250 m3/h", "1750 m3/h", "3100 m3/h", "5200 m3/h" ], "answer": "3100 m3/h", "explanation": "The Day 4 pipeline table shows a 16-inch liquid manifold with a maximum flow rate of 3100 m3/h." }, { "id": 3, "topic": "Loading Capacity", "question": "What total loading capacity is given when using both liquid headers simultaneously?", "options": [ "2100 m3/h", "2600 m3/h", "5200 m3/h", "7600 m3/h" ], "answer": "5200 m3/h", "explanation": "The loading capacity slide states a maximum total loading capacity of 5200 m3/h using both liquid headers." }, { "id": 4, "topic": "Pressure Management", "question": "During loading, what tank pressure range should be maintained using the reliquefaction plant?", "options": [ "0.00 to 0.02 barG", "0.04 to 0.20 barG", "0.30 to 0.50 barG", "0.70 to 1.00 barG" ], "answer": "0.04 to 0.20 barG", "explanation": "The pressure management guidance says to use compressors to maintain tank pressure in the 0.04 to 0.20 barG range." }, { "id": 5, "topic": "Loading Modes", "question": "In loading with vapour return, what is normally returned to the terminal?", "options": [ "Only condensed liquid", "The initial tank atmosphere", "Only seawater vapour", "Cargo pump lubricating oil" ], "answer": "The initial tank atmosphere", "explanation": "With vapour return, the initial tank atmosphere such as nitrogen or mixed atmosphere is returned to the terminal." }, { "id": 6, "topic": "Loading Without Vapour Return", "question": "Without vapour return, what system is used to manage rising tank vapour pressure?", "options": [ "Main engine turbocharger", "Reliquefaction plant", "Ballast pump crossover", "IG generator only" ], "answer": "Reliquefaction plant", "explanation": "When vapour return is unavailable, the reliquefaction plant compresses and liquefies displaced vapour to control tank pressure." }, { "id": 7, "topic": "Pre-Loading Preparation", "question": "Which of the following is part of pre-loading preparation?", "options": [ "Dry-docking the vessel", "Custody transfer measurement before loading begins", "Stopping all water curtains", "Opening all manifold blinds permanently" ], "answer": "Custody transfer measurement before loading begins", "explanation": "The pre-loading preparation slide includes custody transfer measurement, communication checks, arm connection, and safety checks." }, { "id": 8, "topic": "ESD Triggers", "question": "Which condition is listed as an automatic Emergency Shutdown trigger?", "options": [ "Tank overfill alarm activation", "Cargo pump discharge temperature of 20C", "Bridge clock failure", "Sound-powered phone test" ], "answer": "Tank overfill alarm activation", "explanation": "The ESD trigger slide states that overfill alarm activation automatically triggers ESD." }, { "id": 9, "topic": "ESD Triggers", "question": "At approximately what temperature do fusible plugs melt to trigger ESD and water spray?", "options": [ "50C to 60C", "70C to 80C", "98C to 104C", "140C to 160C" ], "answer": "98C to 104C", "explanation": "The fusible plugs are described as melting in a fire between about 98C and 104C." }, { "id": 10, "topic": "ESD Effects", "question": "What happens to cargo pumps and compressors when ESD is activated?", "options": [ "They automatically switch to manual mode", "They stop", "They run at reduced speed only", "Only the booster pump stops" ], "answer": "They stop", "explanation": "ESD causes all cargo pumps, booster pumps, cargo compressors, and refrigerant compressors to stop." }, { "id": 11, "topic": "ESD Levels", "question": "What is the main function of ESD2 in the loading arm system?", "options": [ "Close manifold ESD valves only", "Release the loading arms through the PERC", "Start reliquefaction compressors", "Open vent mast valves" ], "answer": "Release the loading arms through the PERC", "explanation": "The ESD1/ESD2 slide states that ESD2 is the release of loading arms via the Powered Emergency Release Coupling." }, { "id": 12, "topic": "PERC", "question": "What remains on the ship's manifold after PERC release?", "options": [ "The complete loading arm", "The upper section of the arm", "The lower section", "Nothing remains attached" ], "answer": "The lower section", "explanation": "The PERC description notes that the lower section remains on the ship's manifold after coupling release." }, { "id": 13, "topic": "Cold ESD", "question": "When should the cold ESD test be performed?", "options": [ "Before arm cooldown in ambient condition", "After cargo lines and arms are cooled down under cryogenic conditions", "Only during dry dock", "Only after sailing from the terminal" ], "answer": "After cargo lines and arms are cooled down under cryogenic conditions", "explanation": "Cold ESD is performed after lines and arms are cooled down, under actual cryogenic conditions." }, { "id": 14, "topic": "ESD Trip Test", "question": "According to IGC Code 18.10.2, within what time should liquid piping ESD valves close fully and smoothly?", "options": [ "10 seconds", "20 seconds", "30 seconds", "60 seconds" ], "answer": "30 seconds", "explanation": "The ESD trip test slide states that liquid line ESD valves must close fully and smoothly within 30 seconds." }, { "id": 15, "topic": "Filling Limits", "question": "What filling limit is stated under IGC Code Chapter 15 on the Day 4 slides?", "options": [ "95.0%", "96.5%", "98.0%", "99.5%" ], "answer": "98.0%", "explanation": "The filling limits slide states a filling limit of 98.0%." }, { "id": 16, "topic": "Loading Limit Formula", "question": "In the loading limit formula, what does reference temperature mean?", "options": [ "The current seawater temperature", "The temperature corresponding to the saturated vapor pressure at the PRV set pressure", "Ambient air temperature at manifold", "The cargo pump discharge temperature" ], "answer": "The temperature corresponding to the saturated vapor pressure at the PRV set pressure", "explanation": "Reference temperature is defined as the temperature corresponding to the saturated vapor pressure of the LEG at the set pressure of the pressure relief valves." }, { "id": 17, "topic": "Sloshing Restrictions", "question": "For membrane tanks, what upper level is shown as a sloshing restriction limit for sea-going conditions?", "options": [ "50% H", "70% H", "85% H", "99% H" ], "answer": "70% H", "explanation": "The sloshing restrictions slide shows an upper limit of 70% H and a lower limit of 10% H." }, { "id": 18, "topic": "Loading Start", "question": "At the beginning of loading, when should the operator request a rate increase from the terminal?", "options": [ "Immediately after arm connection", "Only when tank pressure is stable", "Before starting reliquefaction compressors", "After all tanks are at 95%" ], "answer": "Only when tank pressure is stable", "explanation": "The loading start procedure says to request rate increase only after pressure is stable." }, { "id": 19, "topic": "Loading Rate Control", "question": "Why are tank levels staggered before topping off?", "options": [ "To ensure simultaneous completion of all tanks", "To avoid simultaneous tank completion and improve control", "To increase sloshing deliberately", "To stop all vapour generation" ], "answer": "To avoid simultaneous tank completion and improve control", "explanation": "Staggering tank levels helps avoid simultaneous completion and allows topping-off to be controlled more safely." }, { "id": 20, "topic": "High Level Alarm Test", "question": "When is a high-level alarm test required by raising cargo liquid to the alarm point?", "options": [ "Every watch during loading", "At the first full loading after delivery and after each dry-docking", "Only when loading without vapour return", "Only for propane cargoes" ], "answer": "At the first full loading after delivery and after each dry-docking", "explanation": "The high-level alarm test requirement is stated for the first full loading after delivery and after each dry-docking." }, { "id": 21, "topic": "Overflow Protection", "question": "At what level does the filling valve close at Very High level in Tank 1?", "options": [ "95.0%", "96.7%", "98.5%", "99.0%" ], "answer": "98.5%", "explanation": "For Tank 1, LAVH (Very High) is shown as 98.5% and causes the filling valve to close." }, { "id": 22, "topic": "Loading Completion", "question": "Why should reliquefaction plant suction be stopped before topping off?", "options": [ "To increase vaporization on the liquid surface", "To allow accurate sounding of the liquid level", "To force ESD activation", "To cool the manifold drains" ], "answer": "To allow accurate sounding of the liquid level", "explanation": "Stopping reliquefaction suction reduces surface evaporation and allows a more accurate sounding." }, { "id": 23, "topic": "Post-Loading", "question": "After loading, why should one filling valve be kept open?", "options": [ "For entrapped liquid drainage and thermal expansion protection", "To allow seawater to enter the line", "To increase cargo pressure", "To keep the ESD test active" ], "answer": "For entrapped liquid drainage and thermal expansion protection", "explanation": "The post-loading guidance says one filling valve should remain open to drain entrapped liquid and protect against thermal expansion." }, { "id": 24, "topic": "Arm Disconnection", "question": "What is the principal objective during cargo arm disconnection?", "options": [ "Increase manifold pressure quickly", "Eliminate liquid release risk and minimize vapour release", "Maximize cargo loss for sampling", "Keep all vapour lines commoned to shore" ], "answer": "Eliminate liquid release risk and minimize vapour release", "explanation": "The arm disconnection overview states that the principal objective is to eliminate liquid release risk and minimize vapour release to atmosphere." }, { "id": 25, "topic": "Final Disconnection", "question": "What gas-content condition is required at the manifold drain before final disconnection?", "options": [ "CH4 below 10%", "CH4 below 5%", "CH4 below 2%", "O2 below 21%" ], "answer": "CH4 below 2%", "explanation": "The final disconnection slide specifies CH4 less than 2% at the manifold drain." }, { "id": 26, "topic": "Deepwell Pumps", "question": "Where is the motor located on the deep-well centrifugal cargo pump arrangement?", "options": [ "At the pump impeller near tank bottom", "On the tank dome with a long shaft drive", "Inside the cargo line strainer", "On the seawater pump skid" ], "answer": "On the tank dome with a long shaft drive", "explanation": "The Day 4 cargo pump slide describes a motor on the tank dome with a long shaft to the pump." }, { "id": 27, "topic": "Pump Specifications", "question": "What rated flow capacity is given for the Day 4 cargo pump specification overview?", "options": [ "200 m3/h", "400 m3/h", "650 m3/h", "800 m3/h" ], "answer": "650 m3/h", "explanation": "The pump specification slide lists a capacity of 650 m3/h." }, { "id": 28, "topic": "Shaft Sealing", "question": "What is the key advantage of the double mechanical seal with pressurized oil?", "options": [ "It prevents cargo leakage automatically", "It removes seawater fouling from the pump", "It eliminates the need for level gauges", "It allows the pump to run dry indefinitely" ], "answer": "It prevents cargo leakage automatically", "explanation": "The shaft sealing system uses pressurized oil and double mechanical seals to prevent cargo leakage to atmosphere." }, { "id": 29, "topic": "Seal Filling Procedure", "question": "What pressure should the shaft seal be maintained at relative to tank pressure after filling?", "options": [ "0.5 bar below tank pressure", "Equal to tank pressure", "1 bar above tank pressure", "3 bar above manifold pressure" ], "answer": "1 bar above tank pressure", "explanation": "The filling procedure states that shaft seal pressure should be 1 bar above tank pressure." }, { "id": 30, "topic": "Seal Refill", "question": "When should the shaft sealing system be refilled?", "options": [ "When seal pressure falls below 0.4 bar above tank pressure", "Only once per voyage", "Whenever tank level reaches 95%", "When seawater temperature drops below 20C" ], "answer": "When seal pressure falls below 0.4 bar above tank pressure", "explanation": "The refill guidance says refill is needed when shaft seal pressure approaches the minimum requirement of 0.4 bar above tank pressure." } ], "courseFolder": "VLEC Managment", "quizFolder": "Day 4 Revision" }
Saving validates the JSON and requires a top-level
questions
array.
Save Mentora Quiz
View Current File