PSCRB Exit Exam • Set 3 Question 30 of 30
The liquid in the wet card compass is a mixture of
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Direct Answer
Option D: Distilled water and pure ethyl alcohol
The liquid used in a wet card compass is a specific mixture, usually distilled water and pure ethyl alcohol (or sometimes glycerin), to prevent freezing and dampen oscillations.
All Options
A
None of the above
B
Distilled water and methyl alcohol
C
Distilled water and isopropyl alcohol
D
Distilled water and pure ethyl alcohol
(Correct Answer)
Detailed Explanation & Context
The liquid used in a wet card compass is a specific mixture, usually distilled water and pure ethyl alcohol (or sometimes glycerin), to prevent freezing and dampen oscillations.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Proficiency in Survival Craft and Rescue Boats (PSCRB).
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