What is the twenty-minute rating of battery?(a) Rate of current for 20 minutes with a minimum cell voltage of 1.5 V(b) Time for which the battery can supply 25 A at 80℉ with minimum cell voltage 1.75 V(c) The current which the battery can supply continuously for 30 seconds with minimum cell voltage 1.2 V(d) Lasting power of a battery on a small loadThe question was asked in a national level competition.This is a very interesting question from Storage Batteries in chapter Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

What is the twenty-minute rating of battery?(a) Rate of current for 20

1.	What is the twenty-minute rating of battery?(a) Rate of current for 20 minutes with a minimum cell voltage of 1.5 V(b) Time for which the battery can supply 25 A at 80℉ with minimum cell voltage 1.75 V(c) The current which the battery can supply continuously for 30 seconds with minimum cell voltage 1.2 V(d) Lasting power of a battery on a small loadThe question was asked in a national level competition.This is a very interesting question from Storage Batteries in chapter Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering
Answer» Correct choice is (a) Rate of current for 20 minutes with a minimum cell voltage of 1.5 V Explanation: The rate of current 20 minutes with a minimum cell voltage of 1.5 V is called a twenty-minute RATING of the battery. The TEMPERATURE of the battery at the start of the test is brought to 80℉. It REPRESENTS the rate of current a battery can deliver continuously.

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