Q9 (10 Marks) Electrical Circuits & Calculations 🔥 Repeated 3x in exams
MET • Written Exam

(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

Appeared In: Dec 2020Jan 2019Sep 2018

Verified Model Answer (Text Solution)

Structured for DG Shipping MEO Class II examination scoring criteria.

Exam Ready
Part (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).
  • Check the battery voltage to ensure it's within the acceptable range.
  • Newer maintenance-free batteries often have indicators to show battery condition (e.g., green for good, red for discharged).

In addition to these routine checks, maintaining a clean, dry, and well-ventilated battery room. Safety precautions such as wearing appropriate protective gear (gloves, eye protection) are required when handling batteries. Emergency response measures for acid spills should be in place.

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