Class 2 (2nd Engineer) MET 📅 Sep 2018

Exam Question

(a) Briefly describe the maintenance routines carried out for emergency batteries onboard.

(b) A power of 36 W is to be dissipated in a resistor connected across the terminals of a battery, having emf of 20V and an internal resistance of 1Ω. Find

(i) What values of resistance will satisfy this condition.

(ii) The terminal voltage of the battery for each of the resistances and

(iii) The total power expenditure in each case

Reference Answer

(a) Maintenance routines for emergency batteries onboard:
Check the battery terminals for tightness and corrosion. Clean the battery and keep it dry. Grease terminals with petroleum jelly to prevent corrosion.
Check the electrolyte level . Add distilled water if it's low.
Check the specific gravity of the electrolyte using a hydrometer (this is only applicable to certain types of batteries, typically lead-acid).

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