Free USCG-MOT Practice Questions

Question 1

An ocean tug is towing a loaded barge on a wire hawser. In a long swell, the wire repeatedly lifts nearly clear of the water and snatches tight as the vessels separate. There is ample sea room and water depth, and more hawser can safely be paid out. Which adjustment most directly cushions these peak loads?

Accepted Answer

Pay out more hawser to increase the available catenary.

Answer

Shorten the hawser to keep the barge closer to the tug's stern.

Answer

Increase towing speed until the hawser remains continuously stretched tight.

Answer

Shorten the bridle legs to reduce the barge's freedom to yaw.

Question 2

Under the International Rules, a tug towing astern and a ferry are crossing in clear visibility, outside a narrow channel or traffic separation scheme. Neither vessel has restricted maneuverability. The ferry approaches from the tug's port side and makes an early, substantial alteration to pass astern of the entire tow. Repeated observations confirm that the ferry's action is effective. What should the tug do during the passage?

Accepted Answer

Maintain course and speed while monitoring the ferry's passage.

Answer

Reduce immediately to bare steerageway until the ferry clears the last barge.

Answer

Alter substantially to starboard to provide the ferry with additional clearance.

Answer

Increase speed to pull the barge across the ferry's projected track sooner.

Question 3

Shipyard personnel plan a routine inspection inside a barge void under 29 CFR 1915.12. Calibrated sampling throughout the space shows 20.8% oxygen and flammable vapor at 14% of the lower explosive limit (LEL). Tested toxic contaminants are below their applicable exposure limits. No hot work is planned. How should the competent person classify the space for this entry?

Accepted Answer

Not safe for workers; 14% LEL exceeds the 10% routine-entry threshold.

Answer

Safe for workers, but not for hot work.

Answer

Safe for entry with continuous ventilation and oxygen monitoring.

Answer

Safe for workers wearing SCBA, because their breathing air is independent of the space's atmosphere.

Question 4

While following the Atlantic Intracoastal Waterway southbound, a towing vessel reaches an intersection with a separately marked channel. A red nun buoy carries a yellow square. The chart confirms that the vessel is continuing along the ICW rather than turning into the other channel. How is this buoy to be passed?

Accepted Answer

Keep it to port because the yellow square governs this ICW passage.

Answer

Keep it to starboard, following its red lateral color.

Answer

Keep it to starboard; the nun shape overrides the yellow square.

Answer

Pass on either side because the yellow marking removes the buoy's lateral significance.

Question 5

A compass check on a steady heading gives a shore-range bearing of 146° true and 151° by the standard magnetic compass. Current variation is 3° west. The deviation to record for this heading is:

Accepted Answer

2° west

Answer

2° east

Answer

5° west

Answer

8° west

Question 6

A twin-screw towboat moving ahead in a straight, narrow river reach draws close to the starboard bank. Her bow begins to sheer to port while her stern moves toward the bank. Both rudders follow helm orders, engine loads are balanced, and the wind is negligible. Which mechanism best fits this combination?

Accepted Answer

Bank cushion at the bow combined with bank suction at the stern.

Answer

A port rudder stuck away from its ordered position.

Answer

Unequal ahead thrust from the two propellers.

Answer

Shallow-water squat producing a change in fore-and-aft trim as the depth decreases.

Question 7

An upbound towboat and a downbound towboat with a following current are meeting in a narrow channel on the Mississippi River. They are in sight, 0.4 mile apart. The downbound master proposes a starboard-to-starboard passage and sounds two short blasts. The upbound master determines that the proposed passage is safe, although the upbound tow is larger. What is the appropriate response?

Accepted Answer

Answer with two short blasts and permit the proposed passage.

Answer

Answer with one short blast and arrange a port-to-port passage instead.

Answer

Sound five short blasts and require the smaller downbound tow to give way.

Answer

Answer with one prolonged blast before maneuvering for the proposed meeting.

Question 8

A tug's machinery-space fire continues after the initial portable-extinguisher attack. All personnel are outside and accounted for. Fuel, machinery, and ventilation have been shut down as required by the installed total-flooding CO2 system's procedures, and the space is closed. The release station is safely accessible. What is the next firefighting action?

Accepted Answer

Discharge the fixed CO2 system and keep the machinery space sealed.

Answer

Reopen the normal ventilation louvers during discharge.

Answer

Send an SCBA-equipped team inside to locate the flames.

Answer

Keep the fixed charge in reserve and continue external boundary cooling alone.

Question 9

A navigator takes a corrected bearing of a lighthouse at 0810 and a corrected bearing of a different charted tower at 0825. The tug has moved between observations, and its intervening ground displacement is established. The navigator intersects the two original bearing lines and labels the crossing an 0825 fix. How must the plot be corrected?

Accepted Answer

Advance the 0810 line parallel to itself by the ground displacement, then intersect it with the 0825 line.

Answer

Retain the intersection because both observed objects have fixed charted positions.

Answer

Retard the 0825 line to 0810 and label its intersection with the first line as the 0825 position.

Answer

Move the original intersection forward by half the tug's displacement between observations.

Question 10

Before loading petroleum into a tank barge, the vessel and shore persons in charge complete the required pretransfer inspection and agree on communications and shutdown procedures. Neither has signed the Declaration of Inspection. The shore operator asks to start at a low rate while the signatures are obtained. What must happen before oil starts flowing?

Accepted Answer

Both persons in charge must sign the Declaration of Inspection.

Answer

The barge person in charge must sign; the shore signature may follow after startup.

Answer

Both persons in charge must authorize startup verbally; the signatures may follow the initial leak check.

Answer

The shore person in charge must record the starting rate; signatures are needed before full-rate transfer.

Free USCG-MOT Practice Questions

Domain 1: Rules of the Road: Inland and International Q100 (TV01/TV02), or Inland Q300 (Western Rivers TV03)

Question 1

Question 2

Domain 2: Deck General: Q410 (OC/NC), Q418 (Great Lakes and Inland), Q423 (Western Rivers)

Question 3

Question 4

Question 5

Domain 3: Deck Safety: Q411 (OC/NC), Q419 (Great Lakes and Inland), Q424 (Western Rivers)

Question 6

Question 7

Domain 4: Navigation General: Q412 Near Coastal OR Q413 Oceans; Q420 Great Lakes and Inland; Q425 Western Rivers

Question 8

Domain 5: Navigation Problems: Chart Plot: Q414 (OC/NC), Q421 (Great Lakes and Inland), Q426 (Western Rivers)

Question 9

Domain 6: Navigation Problems: Near Coastal (Q415), TV01 OC/NC routes

Question 10

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