The main propulsion diesel engines fitted on...

Question 1 / 2066636eef28f7522a1c51fe9f

Question 1 of 2066636eef28f7522a1c51fe9f

The main propulsion diesel engines fitted on your fishing industry factory ship are started with compressed air using the system illustrated. What would be the FIRST consequence of having the start solenoid valve energized open by depressing the start button? Illustration MO-0200

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🔍 Key Concepts

• Follow the pinion engaging line from the air supply through the solenoid valve and see which component it reaches first. • Notice which motor’s pinion is shown in the engaged vs retracted position in the illustration. • Understand that energizing the solenoid opens the path for air to move an actuator before the main cranking air flows to spin the motors.

💭 Think About

• When the start button is pressed, what does opening the solenoid air valve allow compressed air to do along the pinion engaging line? • Looking at the check valve location, which motor can receive the first movement/force to change its pinion position? • Would a starting system normally try to mesh a pinion with the flywheel before or after applying high‑volume cranking air to spin the engine? Apply that logic here.

✅ Before You Answer

• Verify which motor (upper or lower) is directly connected to the pinion engaging line coming from the solenoid air valve. • Confirm the function of the check valve—does it allow air to travel from the solenoid toward the motor actuator or back the other way? • Make sure your choice reflects the very first mechanical consequence: a change in pinion engagement, not yet the spinning of the engine.

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Question 1 of 20

The lower cranking air motor drive pinion is engaged to the engine flywheel.

The upper cranking air motor drive pinion is disengaged from the engine flywheel.

The lower cranking air motor drive pinion is disengaged from the engine flywheel.

The upper cranking air motor drive pinion is engaged to the engine flywheel.

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Question 1 / 2066636eef28f7522a1c51fe9f

Question 1 of 2066636eef28f7522a1c51fe9f

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Question 1 of 20

66636eef28f7522a1c51fe9f

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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