u.s.c.g. merchant marine exam mobile offshore drilling

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U.S.C.G. Merchant Marine Exam

Mobile Offshore Drilling Units

Q441 BCO – MODU Operations

(Sample Examination)

of 12 Q441 BCO – MODU Operations

7/29/2021

Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0

Choose the best answer to the following Multiple Choice Questions.

1. In MODU drilling operations, the term tripping means __________.

o (A) welding hard metal to tool joints o (B) sliding a joint of drill pipe down to the pipe rack ramp o (C) releasing the tongs from the drill pipe • (D) hoisting drill pipe out of and returning it to the wellbore

If choice D is selected set score to 1.

2. The DEEP DRILLER is loaded as shown in the Sample Load Form #5 (Survival), when an unexpected, slowly increasing port list and bow down trim occurs. A leak in C1P is found. By deballasting from ballast tanks 2P and 3P, the inclination slowly decreases. The increase in the longitudinal free surface correction is __________.

o (A) 0.90 foot o (B) 0.83 foot o (C) 0.57 foot • (D) 0.49 foot


3. The transfer procedures required to be followed on tankships shall contain which item?

o (A) A list of each port of discharge • (B) A line diagram of the vessel's transfer piping o (C) The duties by name of each person in charge required for each transfer operation o (D) A current crew list

If choice B is selected set score to 1.

4. In selecting a tug for moving a MODU, consideration should be given to its __________.

o (A) indicated horsepower, bollard pull, and displacement o (B) indicated horsepower, maneuverability, and displacement • (C) bollard pull, displacement, and maneuverability o (D) indicated horsepower, bollard pull, and maneuverability

If choice C is selected set score to 1.


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Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 5. Subtracting the height of the center of gravity corrected for longitudinal free surface effects from the

height of the longitudinal metacenter of a MODU yields __________.

• (A) GML o (B) GM o (C) KGL o (D) KML

If choice A is selected set score to 1.

6. The COASTAL DRILLER, following discharge of preload, should __________.

• (A) close all dump valves o (B) replace dump valves o (C) leave dump valves open o (D) remove dump valves


7. Accumulations of H2S gas on a MODU can be dangerous. It is imperative that personnel know that H2S gas possesses which of the listed characteristics?

o (A) mildly toxic o (B) lighter than air • (C) heavier than air o (D) a yellow gas that is easily recognized


8. When the height of the metacenter has the same value as the height of the center of gravity, the metacentric height is equal to __________.

o (A) the height of the metacenter o (B) the height of the center of gravity o (C) the same as half the height of the metacenter • (D) zero


9. Apparent wind speed blowing across a MODU under tow can be measured by a(n) __________.

o (A) wind vane o (B) barometer o (C) thermometer • (D) anemometer



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Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 10. During storm conditions on a MODU, the mooring tensions should be adjusted so that __________.

o (A) all horizontal tension forces on the windward lines are no greater than the vertical tension forces

o (B) all mooring lines have a different tension o (C) the leeward lines have higher tension than the windward lines • (D) the maximum tension of the most heavily loaded line does not exceed the safe working load


11. An uncontrolled flow of gas, oil, or other well fluids into the atmosphere is called a __________.

o (A) breakout • (B) blowout o (C) kick o (D) flow


12. In MODU construction, a greater number of watertight bulkheads results in __________.

o (A) reduced compartmentation o (B) greater deck load capacity • (C) increased capacity to set flooding boundaries o (D) decreased capacity to set flooding boundaries


13. The COASTAL DRILLER has a change of trim by the head of 2.0 feet. What is the change of draft at the forward draft marks?

o (A) 0.66 feet o (B) 1.00 feet • (C) 1.33 feet o (D) 2.00 feet


14. The COASTAL DRILLER is loaded as shown in the Sample Load Form #1 (Rig Move). If the entire contents of bulk tanks #2 and #3 are back-loaded to an offshore supply vessel, what transverse moment would have to be created to level the unit in list at the new draft?

o (A) -3,604 ft-kips o (B) -4 ft-kips • (C) 3,470 ft-kips o (D) 7,088 ft-kips



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Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 15. You discharge food waste overboard at sea. You have recorded your vessel's position as required,

what other items must be included in the report?

o (A) The vessel's latitude and longitude is all that is required o (B) The vessel's latitude, longitude, course, speed, and a copy of that days noon position slip o (C) The vessel's latitude, longitude and approximate depth of water • (D) The vessel's latitude, longitude, date and time of the discharge


16. The DEEP DRILLER is loaded as shown in Sample Load Form #4 (Drilling). What would be the new sum of vertical moments for Fuel Oil if the entire contents of Tank 4P are transferred to Tank 4S?

• (A) 3,493 foot-tons o (B) 1,797 foot-tons o (C) 100 foot-tons o (D) 1,748 foot-tons


17. On the COASTAL DRILLER, the bilge discharge is normally through the __________.

o (A) skimmer tank o (B) dump valves • (C) overboard discharge o (D) sump valves


18. The DEEP DRILLER, while loaded as shown in the Sample Load Form #4 (Drilling), suffers damage to the starboard aft column below the waterline. Pumping from tanks 8S and 9S is not sufficient to prevent increasing starboard list and stern down trim. You should consider counterflooding in tank __________.

• (A) 1P o (B) 1S o (C) 10P o (D) C2BP


19. A casing string that is run below the previous casing string, but does not extend to the wellhead is called a __________.

• (A) liner o (B) squnch joint o (C) production string o (D) packer



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Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 20. In the DEEP DRILLER, VCG is obtained from the sum of the vertical moments by __________.

o (A) multiplying by displacement o (B) adding displacement • (C) dividing by displacement o (D) subtracting displacement


21. If you see someone fall overboard from a MODU, you should __________.

o (A) immediately jump in the water to help the individual • (B) call for help and keep the individual in sight o (C) run to the radio room to send an emergency message o (D) go to the control room for the distress flares


22. Leg penetration to depths which require pullout forces greater than that which can be supplied by the buoyancy of the hull may exist in __________.

• (A) soft to firm clays o (B) silt o (C) soft mud o (D) sand


23. After jacking down your liftboat you have an unexpected list. You find that the only cause of this list must be a flooded leg. To keep adequate stability you should __________.

o (A) pump out all ballast to increase reserve buoyancy • (B) jack back up and ballast the vessel's high side as necessary o (C) proceed with all legs half raised to lower KG o (D) get underway with the flooded leg ONLY half raised to reduce KG


24. When taking soundings on a MODU, coating the tape with chalk helps to __________.

o (A) reduce possibility of sparks o (B) show the depth of any water in an oil tank • (C) better identify the correct reading o (D) make the tape roll easier



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Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 25. The COASTAL DRILLER, with no trim, is at a true mean draft of 10 feet and 10 inches. TM is -6,800

ft-kips. Using only tanks 1, 25, and 26, how many kips of drill water must be transferred to level the jack-up?

o (A) Transfer 100 kips from 26 to 25 o (B) Transfer 200 kips from 25 to 26 • (C) Transfer 100 kips from 25 to 26 o (D) Transfer 53.1 kips each from 25 and 26 forward to 1


26. Until a change to lightweight has been approved, the weights and moments shown in the Changes to Lightweight Record of the COASTAL DRILLER are treated as __________.

o (A) fixed loads • (B) variable loads o (C) basic loads o (D) stationary loads


27. The DEEP DRILLER, at 58.0 feet draft in sea water, discharges 200 long tons. What is the new draft?

o (A) 55.55 feet • (B) 56.55 feet o (C) 57.05 feet o (D) 59.45 feet


28. Fighting a rig fire in a watertight compartment with hoses could reduce the stability of the rig by __________.

o (A) progressive downflooding o (B) reducing the KG to minimum allowable • (C) causing a list due to the water in the compartment o (D) reducing the level of drill water from the storage tanks


29. When removing the cap from a sounding tube on a MODU, the sound of air escaping indicates the tank __________.

• (A) may be partially flooded o (B) is completely flooded o (C) level has dropped o (D) is full



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Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 30. Keeping the draft of a MODU at or below the load line mark will insure that the unit has adequate

__________.

• (A) reserve buoyancy o (B) critical motions o (C) lightweight displacement o (D) reserve ballast


31. How much drill water should be transferred from tanks 23 and 24 to tank 1 to level the COASTAL DRILLER, in transit at a draft of 10 feet 6 inches, if the total longitudinal moments are 1,700,000 ft-kips?

o (A) 438 kips • (B) 451 kips o (C) 521 kips o (D) 537 kips


32. The Cantilever Beam Load Chart for the COASTAL DRILLER shows the load limits in the hook, setback, conductor tension, and __________.

o (A) pipe rack loads o (B) wind loads o (C) wave loads • (D) rotary loads


33. Scouring usually occurs with soils such as __________.

o (A) clay • (B) sand o (C) mud o (D) coral


34. A set of clamps that are latched onto the drill pipe to allow the driller to raise or lower the drill string out of or into the hole are the __________.

• (A) elevators o (B) lifts o (C) collars o (D) clamps



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Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 35. The wire ropes of the riser tensioning system are attached to the __________.

o (A) inner barrel of the telescoping joint o (B) ball joint • (C) outer barrel of the telescoping joint o (D) marine riser connector


36. Sea water temporarily pumped into tanks to simulate the increased vertical loading of environmental forces is termed __________.

o (A) liquid variable load o (B) basic load • (C) preload o (D) fixed load


37. The COASTAL DRILLER's ability to meet the damage stability criteria depends on maintaining a watertight integrity, KGL and KGT less than maximum allowed, level attitude, and displacement less than __________.

o (A) 11,777 kips o (B) 13,158 kips • (C) 14,158 kips o (D) 17,280 kips


38. An integral part of a blowout preventer that serves as the closing element on an open hole, and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the __________.

o (A) shear ram • (B) blind ram o (C) pipe ram o (D) annular ram



7/29/2021

Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 39. The COASTAL DRILLER is observed to be level at a draft of 10 feet 6 inches. At the same time, the

calculated load form shows the displacement to be 13,445 kips. What is the weight of the missing load?

o (A) 46 kips o (B) 84 kips o (C) 189 kips • (D) 217 kips


40. Salt water ballast tank 2P on the DEEP DRILLER contains 5.0 feet of ballast. It is decided to fill the tank. What is the VCG of the added liquid?

o (A) 7.5 feet o (B) 10.0 feet • (C) 12.5 feet o (D) 15.0 feet


41. The DEEP DRILLER is loaded as shown in the Sample Load Form #3 (Preparing to Drill). If all the liquid mud (see table 8) is dumped, what would be the new height of the longitudinal metacenter?

o (A) 61.13 feet • (B) 61.19 feet o (C) 61.22 feet o (D) 62.94 feet


42. Among the valves to open on the DEEP DRILLER, if you have to transfer ballast from Tank 1P to Tank 10S using #1 ballast pump, is valve __________.

o (A) 44 Port o (B) 33 Port o (C) 44 Starboard • (D) 33 Starboard


43. On the COASTAL DRILLER, except when pumping from a tank, the bilge system valves should be __________.

o (A) opened for draining o (B) in the check-stop position • (C) closed o (D) cracked open



7/29/2021

Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 44. Survival practice in the mooring system is to slack off the tensions on the leeward side and

__________.

o (A) tighten the anchor buoys on the leeward side anchors o (B) deballast the unit to transit draft o (C) release the anchors on the windward side • (D) adjust as evenly as practical the windward tensions


45. Which is an exception to the garbage discharge requirements in Annex V to MARPOL 73/78?

• (A) A person falls overboard, and a plastic ice chest is thrown for flotation. o (B) The garbage to be discharged will sink. o (C) The destination port or terminal cannot receive garbage. o (D) Garbage accumulation on board has exceeded storage space.


46. Which of the following items should all MODU personnel be familiar with?

o (A) navigational systems • (B) boarding and operating procedures o (C) maintenance schedule o (D) fuel consumption rates


47. What is the weight of 100 barrels of 17 pound per gallon drilling mud?

o (A) 24.9 kips o (B) 41.5 kips • (C) 71.4 kips o (D) 93.0 kips


48. When the ullage is 5.7 feet in P-Tank #6 for the Deep Driller, the transverse moment for P-Tank #6 is __________.

o (A) 1,288 foot-tons • (B) 1,887 foot-tons o (C) 3,169 foot-tons o (D) 4,596 foot-tons



7/29/2021

Q441 BCO - MODU Operations U.S.C.G. Merchant Marine Exam Mobile Offshore Drilling Units Illustrations: 0 49. Reinforcing frames attached to a bulkhead on a MODU are called __________.

o (A) side longitudinals o (B) brackets • (C) stiffeners o (D) intercostals


50. Which of the following would be the most probable location to encounter explosive and flammable gasses on a MODU?

• (A) on the drill floor and liquid mud handling areas o (B) at any location o (C) in machinery spaces o (D) in bulk storage tanks



7/29/2021

u.s.c.g. merchant marine exam mobile offshore drilling

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