1Q: What is meant by the internal resistance of a cell ?
Ans: The resistance offered by a cell to the flow of electric current through the cell itself is called the internal resistance of the cell.
2Q: Why cell are connected in a mixed group ?
Ans: Cells are connected in a mixed group for obtaining more e.m.f. and more current than that with one cell.
3Q: How will you identify the (+) and (-) terminals of a battery ?
Ans: Terminals are identified with the help of a D.C. voltmeter or a galvanometer.
4Q: What is constant voltage charging method ?
Ans: In this method, the charging voltage is maintained at a constant value. Hence, the rate of initial charging current rests higher than the final charging current.
5Q: What is constant current charging method ?
Ans: In this method, the charging current rate is maintained at a constant value by changing the number of bulbs(loads).
6Q: What is a battery charger ?
Ans: A battery charger is an instrument used for battery charging purposes with AC supply.
7Q: What is trickle charging method ?
Ans: A sulphated battery can be revived by charging it at a very low current rate (IA) for a long time. The process is called trickle charging.
8Q: What are the main steps to be taken for the maintenance of batteries ?
Ans: (1) Clean the battery terminals periodically with a cloth piece soaked in warm water. Apply a small quantity of grease on the terminals after they get dry.
(2) Keep the battery tight to the vehicle's body and keep the vent plugs tight.
(3) Keep the battery plates well immersed in the electrolyte. Add distilled water as and when required.
(4) Don't leave the battery idle.
(5) Don't use a battery if its S.G. has dropped to 1.15.
(6) Don't charge or discharge a battery at a high current rate (above 25A).
9Q: What are the precautions to be observed during battery charging ?
Ans: (1) Charge the battery in an airy room.
(2) Remove the vent plugs during charging.
(3) Keep flames etc. away from the battery.
(4) Keep the charging current rate not more than 3 to 6 amperes.
10Q: What are the merits of secondary cells over primary cells ?
Ans: (1) More terminal voltage.
(2) Rechargeable.
(3) Steady current.
11Q: What is meant by ionisation ?
Ans: The process in which atoms are changed into ions is called ionisation.
12Q: What is an ion ?
Ans: A charged atom is called an ion.
13Q: What is a cation and an anion ?
Ans: (1) Cation: A positively charged ion is called a cation.
(2) Anion: A negatively charged ion is called an anion.
14Q: What is meant by electrolysis ?
Ans: The process of changing the composition of a chemical solution by passing an electric current through the same is known as electrolysis.
15Q: What are the applications of electrolysis ?
Ans: It is used in electroplating, purification of metals, extraction of metals, electro-typing etc.
16Q: What is the purpose of a 'high rate discharge tester' ?
Ans: It is meant for testing the terminal voltage or the charge condition of a lead-acid battery.
17Q: How can you preserve a lead-acid battery for a long time in unused state ?
Ans: Remove battery's electrolyte, wash it with distilled water and dry up the battery's inner portion and then store it.
18Q: What is a solar battery ?
Ans: The device used to accumulate sun light energy in the form of electrical energy is called a solar battery.
19Q: What is a button cell ?
Ans: A very small sized cell is called a button cell. It is usually a tiny dry cell.
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Writing articles is a time pass work.
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Ans: The resistance offered by a cell to the flow of electric current through the cell itself is called the internal resistance of the cell.
2Q: Why cell are connected in a mixed group ?
Ans: Cells are connected in a mixed group for obtaining more e.m.f. and more current than that with one cell.
3Q: How will you identify the (+) and (-) terminals of a battery ?
Ans: Terminals are identified with the help of a D.C. voltmeter or a galvanometer.
4Q: What is constant voltage charging method ?
Ans: In this method, the charging voltage is maintained at a constant value. Hence, the rate of initial charging current rests higher than the final charging current.
5Q: What is constant current charging method ?
Ans: In this method, the charging current rate is maintained at a constant value by changing the number of bulbs(loads).
6Q: What is a battery charger ?
Ans: A battery charger is an instrument used for battery charging purposes with AC supply.
7Q: What is trickle charging method ?
Ans: A sulphated battery can be revived by charging it at a very low current rate (IA) for a long time. The process is called trickle charging.
8Q: What are the main steps to be taken for the maintenance of batteries ?
Ans: (1) Clean the battery terminals periodically with a cloth piece soaked in warm water. Apply a small quantity of grease on the terminals after they get dry.
(2) Keep the battery tight to the vehicle's body and keep the vent plugs tight.
(3) Keep the battery plates well immersed in the electrolyte. Add distilled water as and when required.
(4) Don't leave the battery idle.
(5) Don't use a battery if its S.G. has dropped to 1.15.
(6) Don't charge or discharge a battery at a high current rate (above 25A).
9Q: What are the precautions to be observed during battery charging ?
Ans: (1) Charge the battery in an airy room.
(2) Remove the vent plugs during charging.
(3) Keep flames etc. away from the battery.
(4) Keep the charging current rate not more than 3 to 6 amperes.
10Q: What are the merits of secondary cells over primary cells ?
Ans: (1) More terminal voltage.
(2) Rechargeable.
(3) Steady current.
11Q: What is meant by ionisation ?
Ans: The process in which atoms are changed into ions is called ionisation.
12Q: What is an ion ?
Ans: A charged atom is called an ion.
13Q: What is a cation and an anion ?
Ans: (1) Cation: A positively charged ion is called a cation.
(2) Anion: A negatively charged ion is called an anion.
14Q: What is meant by electrolysis ?
Ans: The process of changing the composition of a chemical solution by passing an electric current through the same is known as electrolysis.
15Q: What are the applications of electrolysis ?
Ans: It is used in electroplating, purification of metals, extraction of metals, electro-typing etc.
16Q: What is the purpose of a 'high rate discharge tester' ?
Ans: It is meant for testing the terminal voltage or the charge condition of a lead-acid battery.
17Q: How can you preserve a lead-acid battery for a long time in unused state ?
Ans: Remove battery's electrolyte, wash it with distilled water and dry up the battery's inner portion and then store it.
18Q: What is a solar battery ?
Ans: The device used to accumulate sun light energy in the form of electrical energy is called a solar battery.
19Q: What is a button cell ?
Ans: A very small sized cell is called a button cell. It is usually a tiny dry cell.
Working from ptc sites is a good time pass as well as we will earn some money.
Visit: www.moneypond.weebly.com
Writing articles is a time pass work.
For some people it is a hobby.
Interesting thing is, this hobby makes you earn good income as well as life time income.
Visit: http://work5minutes2earngoodincome.blogspot.in/
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