Free NMUGI Practice Questions

Question 1

In clear visibility on open U.S. Inland waters, your power-driven vessel has another power-driven vessel crossing from your port side. The other vessel makes an early, substantial alteration to pass astern. Continued observations confirm a safe passing distance, with no other traffic or navigational constraint. How should you handle your vessel while the pass develops?

Accepted Answer

Maintain course and speed, monitoring the other vessel until she is past and clear.

Answer

Reduce to bare steerageway to give the other vessel more time to complete her crossing.

Answer

Alter to port toward her stern to increase the separation between bows.

Answer

Match the other vessel's course alteration so the two vessels become approximately parallel.

Question 2

A laden ship making steady headway with its engine ahead develops a sheer to port near the starboard bank of a narrow, shallow channel. The stern is being drawn toward that bank. Rudder indication follows the helm orders, and neither wind nor current has changed. What is producing this combination of motions?

Accepted Answer

Bow cushion pushes the bow off the bank while bank suction draws the stern toward it.

Answer

Bank suction pulls the bow in while pressure at the stern pushes it away from the bank.

Answer

A cross-current sets the hull bodily to port without creating a turning moment.

Answer

Propeller transverse thrust while backing walks the stern to starboard and the bow to port.

Question 3

An engine-room fire has defeated the initial portable-extinguisher attack. The master orders the fixed total-flooding CO2 system used. Everyone is accounted for outside the space; fuel is isolated, machinery and ventilation are stopped, and all required closures are secured. The prescribed pre-discharge warning has been completed. What should the release team do next?

Accepted Answer

Discharge the CO2 using the approved operating sequence, keeping the space sealed.

Answer

Send a breathing-apparatus team inside for one more attack before release.

Answer

Run the exhaust fan at low speed to distribute the gas.

Answer

Wait until boundary cooling restores normal bulkhead temperatures.

Question 4

The helm order must produce a heading of 126° true. Variation is 8° west; deviation on the intended compass heading is 3° east. Which compass course belongs in the helm order?

Accepted Answer

131° compass

Answer

121° compass

Answer

137° compass

Answer

134° compass

Question 5

After a prolonged gale on Lake Erie dies away, gauges at opposite ends of the lake show alternating rises and falls. When one end rises, the other falls; the oscillations continue after the wind has eased. A mate is assessing the effect on harbor-entry depths. Which explanation fits this record?

Accepted Answer

A seiche: a standing oscillation of the lake water following the wind disturbance.

Answer

Persistent wind setup: water remains piled at the downwind end without reversing.

Answer

An astronomical spring tide: the lunar cycle produces the large alternating lake levels.

Answer

A seasonal level change: evaporation lowers both ends progressively over the same period.

Question 6

For a static lift of a 6.0-tonne machine, two identical sling legs share the load symmetrically. Each leg is 60° above the horizontal and has a straight-pull working load limit of 4.0 tonnes. All other lifting components are adequately rated. Which assessment accounts for the sling angle?

Accepted Answer

About 3.46 tonnes of tension per leg; the legs are within their working load limits.

Answer

About 3.00 tonnes of tension per leg; the legs are within their working load limits.

Answer

About 6.00 tonnes of tension per leg; the legs exceed their working load limits.

Answer

About 2.60 tonnes of tension per leg; the legs are within their working load limits.

Question 7

At a U.S. channel junction, a buoy has a red upper band, a green middle band, and a red light flashing in a two-plus-one group. Your vessel is proceeding in the conventional direction of buoyage and will use the preferred channel. How should this mark be left?

Accepted Answer

To starboard, taking the port-hand branch of the junction.

Answer

To port, taking the starboard-hand branch of the junction.

Answer

On either side; its bands identify a safe-water mark.

Answer

On either side, well clear of the isolated danger it marks.

Question 8

Under the International Rules, a vessel in fog detects a closing target by radar alone, 035° on the starboard bow. The target is not being overtaken. Plotting establishes collision risk. With ample sea room and no other contacts, the master proposes altering to port. What specific objection should the watch officer raise?

Accepted Answer

Rule 19 says to avoid a port alteration for this radar-only target forward of the beam.

Answer

A target on the starboard bow makes this a Rule 15 crossing situation.

Answer

Course alterations must wait until the vessel is identified visually or by AIS.

Answer

Restricted visibility requires stopping propulsion before altering course.

Question 9

Before an ordinary inspection entry during shipyard repairs, a competent person tests a tank under 29 CFR 1915.12. Oxygen is 20.9% by volume, flammable vapor is 14% of the lower explosive limit, and the relevant toxic contaminants are below their exposure limits. No hot work is planned. What does this atmosphere permit?

Accepted Answer

No ordinary entry; the flammable-vapor reading requires ventilation and retesting.

Answer

Ordinary entry with a standby person because the oxygen concentration is normal.

Answer

A brief inspection because the vapor concentration remains below 100% of the lower explosive limit.

Answer

Entry with supplied-air respirators because respiratory protection also controls the ignition hazard.

Question 10

A plotted leg runs due east, 090° true. The vessel will make 10.0 knots through the water, and a steady current sets 180° true at 2.0 knots. There is no wind or leeway. Select the course to steer and resulting speed over ground that will keep the vessel on the plotted track.

Accepted Answer

078.5° true and approximately 9.8 knots over ground.

Answer

101.5° true and approximately 9.8 knots over ground.

Answer

078.5° true and approximately 10.2 knots over ground.

Answer

090.0° true and approximately 10.2 knots over ground.

Free NMUGI Practice Questions

Domain 1: Rules of the Road: International and Inland (Q100), or Inland-only (Q300) where applicable

Question 1

Question 2

Domain 2: Deck General (Q308)

Question 3

Question 4

Domain 3: Deck Safety (Q309)

Question 5

Question 6

Domain 4: Navigation General Great Lakes and Inland (Q310)

Question 7

Question 8

Domain 5: Chart Plot (Q311)

Question 9

Domain 6: Great Lakes Topics (Q312; Great Lakes route only)

Question 10

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