The generator drive engines fitted on your...

Question 1 / 2066636eef28f7522a1c51fc5d

Question 1 of 2066636eef28f7522a1c51fc5d

The generator drive engines fitted on your articulated tug-barge unit are started by the type of starter shown in figure "B" of the illustration. What is the purpose of the gear train situated between the air turbine rotor shaft and the pinion shaft? Illustration MO-0201

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🔍 Key Concepts

• Relationship between gear ratio, speed, and torque in a gear train • Typical operating speed of an air turbine versus the required cranking speed of a diesel engine • How a reduction gear between a high‑speed driver and a low‑speed load affects starting performance

💭 Think About

• Look at the relative sizes of the gears in figure B: which shaft appears to turn faster, the turbine rotor or the pinion that meshes with the engine flywheel? • If the turbine produces relatively low torque at very high speed, what must the gear train do to that speed and torque so the engine can actually crank over? • Among the answer choices, which one describes the usual effect of a speed reduction gear set that allows a small, fast turbine to start a large, slow‑turning engine?

✅ Before You Answer

• Identify which gears are driving and which are driven in the illustration • Decide whether a large diesel engine needs high speed or high torque at its flywheel to start turning • Match the needed effect: When speed changes through gearing, torque changes in the opposite direction (ignoring losses).

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Question 1 of 20

It INCREASES the speed of the pinion shaft as compared to the air turbine rotor shaft for the purposes of INCREASING starter motor torque.

It DECREASES the speed of the pinion shaft as compared to the air turbine rotor shaft for the purposes of INCREASING starter motor torque.

It DECREASES the speed of the pinion shaft as compared to the air turbine rotor shaft for the purposes of DECREASING starter motor torque.

It INCREASES the speed of the pinion shaft as compared to the air turbine rotor shaft for the purposes of DECREASING starter motor torque.

Question 1 / 2066636eef28f7522a1c51fc5d

Question 1 of 2066636eef28f7522a1c51fc5d

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Question 1 of 20

66636eef28f7522a1c51fc5d

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💭 Think About

✅ Before You Answer

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