An alkaline cell is discharged at a steady current of 4A for 12 hours. To restore it to its original state of charge, a steady current of 3A for 20 hours is required. Calculate ah efficiency.

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1
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  1. 80%
  2. 60%
  3. 70%
  4. 90%

Answer (Detailed Solution Below)

Option 1 : 80%
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Detailed Solution

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Concept:

Ah Efficiency (η) = (Output ah)/(input ah)

Calculation:

Output ah = 4 × 12 = 48 ah

Input ah = 3 × 20 = 60 ah

Ah Efficiency (η) = 48/60 = 0.8

η% = 0.8 × 100 = 80%

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