Valve '1', as shown in the illustration,...

Question 1 / 2707066636eef28f7522a1c52046a

Question 1 of 2707066636eef28f7522a1c52046a

Valve '1', as shown in the illustration, should be operated when __________. Illustration MO-0077

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Question 1 of 27070

Valve '1', as shown in the illustration, should be operated when __________. Illustration MO-0077

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Fuel oil system flow paths between the HFO day tank, mixing tank, and main engine • Role of the mixing tank in handling return fuel and possible overflow paths • How viscosity control is actually achieved in this system (note viscometer location and valve 7, not valve 1)

💭 Think About

• Trace the piping connected to valve '1' on the diagram. Where does fuel go if valve 1 is open, and what tank or component does it interact with? • Compare the function of valve 1 with valve 7 near the final heaters and viscometer. Which valve seems linked to viscosity control, and which to tank level/recirculation? • Ask yourself: in which one of the listed operating conditions would you need to change where excess or circulating fuel is sent from the mixing tank?

✅ Before You Answer

• Confirm exactly which tank or component valve 1 connects the mixing tank to on the illustration. • Verify what happens to the mixing tank level if all return fuel keeps circulating and valve 1 remains shut for a long period. • Check that viscosity adjustments in this system are made by the viscometer acting on valve 7 (around the final heaters), not by valve 1, so eliminate any answers that confuse these functions.

Question 1 of 27070

Valve '1', as shown in the illustration, should be operated when __________. Illustration MO-0077

entering or departing port

starting auxiliary boilers

viscosimeter 'V' measures low viscosity

mixing tank is 'full'

Question 1 / 2707066636eef28f7522a1c52046a

Question 1 of 2707066636eef28f7522a1c52046a

Valve '1', as shown in the illustration, should be operated when __________. Illustration MO-0077

Back

Question 1 of 27070

Valve '1', as shown in the illustration, should be operated when __________. Illustration MO-0077

If the question has a related picture, it will appear here.