U.S.C.G. Merchant Marine Exam DDE-1000/4000 HP Q630 Motor Plants Sample Examination

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Asked: April 28, 2021In: Engine, Examination, U.S.C.G. Merchant Marine Exam DDE-1000/4000 HP Q630 Motor Plants Sample Examination

You are assigned to a towing vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine’s crankshaft is turning at 900 rpm, what will be the rotational speed of the two camshafts? Illustration MP-MS-12

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You are assigned to a towing vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine’s crankshaft is turning at 900 rpm, what will be the rotational speed of the two camshafts? Illustration ...Read more

You are assigned to a towing vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine’s crankshaft is turning at 900 rpm, what will be the rotational speed of the two camshafts? Illustration MP-MS-12

(A) 450 rpm
(B) 900 rpm
(C) 1800 rpm
(D) Not enough information is given to determine camshaft rpm.

If choice B is selected set the score to 1.

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Seafarers MeaningExplanier

Asked: April 28, 2021In: Engine, Examination, U.S.C.G. Merchant Marine Exam DDE-1000/4000 HP Q630 Motor Plants Sample Examination

Suppose the diesel generator set drive engines are of the type shown in the illustration on your ship docking tug. What description best represents the operating cycle and aspiration method? Illustration MP-HS-07

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Suppose the diesel generator set drive engines are of the type shown in the illustration on your ship docking tug. What description best represents the operating cycle and aspiration method? Illustration MP-HS-07 (A) Naturally aspirated, two-stroke cycle engine (B) Crankcase scavenged, ...Read more

Suppose the diesel generator set drive engines are of the type shown in the illustration on your ship docking tug. What description best represents the operating cycle and aspiration method? Illustration MP-HS-07

(A) Naturally aspirated, two-stroke cycle engine
(B) Crankcase scavenged, two-stroke cycle engine.
(C) Roots-blown, two-stroke cycle engine.
(D) Roots-blown, four-stroke cycle engine.

If choice C is selected set the score to 1.

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Seafarers MeaningExplanier

Asked: April 28, 2021In: Engine, Examination, U.S.C.G. Merchant Marine Exam DDE-1000/4000 HP Q630 Motor Plants Sample Examination

For diesel engines, such as those used for main propulsion and auxiliary power on river push boats, while running at speed, how is the ignition of fuel within the cylinder achieved?

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(A) Ignition is achieved by the heat of compression created by compressing intake/charge air within the cylinder into a relatively small volume. (B) Ignition is achieved by intense heat by passing an electric current through the element of a specially ...Read more

(A) Ignition is achieved by the heat of compression created by compressing intake/charge air within the cylinder into a relatively small volume.
(B) Ignition is achieved by intense heat by passing an electric current through the element of a specially designed glow plug.
(C) Ignition is achieved by the heat of compression created by compressing the air/fuel mixture within the cylinder into a relatively small volume.
(D) Ignition is achieved by a high voltage electric spark induced across the gap of a specially designed spark plug.

If choice A is selected set the score to 1.

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Seafarers MeaningExplanier

Asked: April 27, 2021In: Engine, Examination, U.S.C.G. Merchant Marine Exam DDE-1000/4000 HP Q630 Motor Plants Sample Examination

What statement concerning fuel cetane rating and the ignition delay period is true as it applies to towboat main propulsion diesel engines?

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What statement concerning fuel cetane rating and the ignition delay period is true as it applies to towboat main propulsion diesel engines?(A) The ignition delay period is the lag in time between when fuel injection is initiated and when fuel ...Read more

What statement concerning fuel cetane rating and the ignition delay period is true as it applies to
towboat main propulsion diesel engines?

(A) The ignition delay period is the lag in time between when fuel injection is initiated and when fuel injection actually begins, and the higher the cetane rating of the fuel the longer the ignition delay period.
(B) The ignition delay period is the lag in time between when fuel injection is initiated and when fuel injection actually begins, and the higher the cetane rating of the fuel the shorter the ignition delay period.
(C) The ignition delay period is the lag in time between when fuel injection actually begins and when combustion actually begins, and the higher the cetane rating of the fuel the longer the ignition delay period.
(D) The ignition delay period is the lag in time between when fuel injection actually begins and when combustion actually begins, and the higher the cetane rating of the fuel the shorter the ignition delay period.

If choice D is selected set the score to 1.

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U.S.C.G. Merchant Marine Exam DDE-1000/4000 HP Q630 Motor Plants Sample Examination

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