A main engine on your fishing trawler has...

Question 1 / 2066636eef28f7522a1c51fe3f

Question 1 of 2066636eef28f7522a1c51fe3f

A main engine on your fishing trawler has experienced a low coolant water level alarm even though the water level in the expansion tank is normal. Assuming that the float activated switch is designed to open at low coolant level to activate the alarm, which of the following would account for this?

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🔍 Key Concepts

• Float switch logic – understand what it means when a switch is designed to open to activate an alarm • Difference between open circuit (no continuity) and closed circuit (continuity) in alarm wiring • How mechanical sticking vs electrical connection problems would affect whether the alarm sees the circuit as open or closed

💭 Think About

• At normal coolant level, should the float switch contacts be open or closed in this design? What does that imply about current flow? • If the alarm is sounding even though the coolant level is normal, what must the alarm circuit be "seeing" – an open or a closed circuit? • For each option, ask: does this condition make the circuit look open or closed to the alarm panel?

✅ Before You Answer

• Identify which choices would result in an open circuit (no continuity) in the alarm wiring when level is actually normal • Rule out any option where the circuit would remain permanently closed, because that would usually prevent a low-level alarm from occurring • Check whether a physically stuck float (not moving) would cause a false low-level alarm or the opposite problem: no alarm when low level actually occurs

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Question 1 of 20

The float level switch contacts are welded closed, not permitting the contacts to open.

The float switch wire connections are loose at the terminals, not permitting continuity through the switch.

The float is binding in the float chamber, not permitting the float to drop.

It is not possible for a low coolant level alarm to occur when the water level is normal.

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Question 1 / 2066636eef28f7522a1c51fe3f

Question 1 of 2066636eef28f7522a1c51fe3f

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Question 1 of 20

66636eef28f7522a1c51fe3f

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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