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51.	Which among the following colour is used to indicate the positive terminal of the battery?(a) Blue(b) Green(c) Black(d) RedThe question was posed to me in an interview for internship.I need to ask this question from Lead-Acid Battery in division Storage Batteries of Automotive Engine Design
Answer» The correct option is (d) Red The best I can EXPLAIN: The positive terminal of the BATTERY is coated with red COLOUR and the NEGATIVE terminal is coated with black colour. During the REMOVAL of the battery first, remove the negative terminal and then the positive terminal.

52.	What is the amount of water and acid present in the electrolyte after the full discharge of the battery?(a) 90% of water and 10% of acid(b) 85% of water and 15% of acid(c) 70% of water and 30% of acid(d) 75% of water and 25% of acidThis question was posed to me in quiz.This interesting question is from Lead-Acid Battery in division Storage Batteries of Automotive Engine Design
Answer» Right choice is (b) 85% of water and 15% of acid Explanation: The RATIO of water and acid in the full DISCHARGED state is 85 per CENT of water and 15 PERCENTAGE of acid whereas in the fully charged condition the electrolyte contains 39 percentage of acid and 61 percentage of water.

53.	Which of the following increase due to which the electrode gravity decreases?(a) Enthalpy(b) Entropy(c) Temperature(d) PressureI have been asked this question in an interview for job.I want to ask this question from Lead-Acid Battery topic in portion Storage Batteries of Automotive Engine Design
Answer» RIGHT option is (c) TEMPERATURE To explain I would say: The ELECTROLYTE gravity varies with temperature. It increases with the decrease in temperature and VICE versa. The gravity value is always mentioned at a specified standard temperature, which is usually 15-degree CENTIGRADE.

54.	What is the correct count of negative plates with respect to positive plates in a battery?(a) Both positive and negative have the same number of plates(b) More positive plates when compared to negative plates(c) More negative plates when compared to positive plates(d) Have no relation between themI have been asked this question in an interview.The question is from Lead-Acid Battery in division Storage Batteries of Automotive Engine Design
Answer» CORRECT choice is (C) More NEGATIVE plates when compared to positive plates Explanation: One positive and one negative group of plates are slid over each other, with separators in between, to form a cell. Most batteries have one more negative plate than positive plates in each cell. The size of plates and their number per cell determine the capacity of the battery.

55.	Which of the following material is used in the positive plate of a lead-acid battery?(a) Sulphuric acid(b) Spongy lead(c) Lead peroxide(d) WaterThe question was asked by my school principal while I was bunking the class.This intriguing question originated from Lead-Acid Battery in division Storage Batteries of Automotive Engine Design
Answer» The correct answer is (c) Lead PEROXIDE To elaborate: When the battery is FULLY CHARGED there is lead peroxide on the positive plate and lead SPONGY on the negative plate as an active material. During the process of discharge, the chemical reactions forms lead sulphate on both the PLATES thereby liberating water.

56.	Which of the following is the material used for separator?(a) Nickel(b) Cast iron(c) Ebonite(d) BronzeThe question was posed to me in quiz.Origin of the question is Lead-Acid Battery in division Storage Batteries of Automotive Engine Design
Answer» The correct answer is (c) Ebonite To explain: To avoid direct CONTACT and thus short-circuiting of positive and NEGATIVE plates, thin SHEETS of some no conducting material are inserted between them. These sheets are called as separators. These are made from ebonite, porous rubber, FIBREGLASS etc.

57.	Which of the following energy is converted to electricity by the battery?(a) Mechanical energy(b) Chemical energy(c) Thermal energy(d) Electrical energyThe question was asked during an interview for a job.Question is taken from Lead-Acid Battery topic in division Storage Batteries of Automotive Engine Design
Answer» Correct answer is (b) CHEMICAL energy To elaborate: A BATTERY is a device for storing chemical energy and converting the same into electricity. It SUPPLIES current to OPERATE the LIGHTING and various accessories, when the engine is not running, for the starting of the vehicle as well as to ignition system.

58.	What is the total number of cells present in a 12-volt battery?(a) 5(b) 6(c) 3(d) 4The question was posed to me in a job interview.I'm obligated to ask this question of Lead-Acid Battery in portion Storage Batteries of Automotive Engine Design
Answer» The correct CHOICE is (b) 6 Explanation: A 12-volt battery CONSISTS of six cells connected in series WHEREIN each cell PROVIDES 2 volts. One positive and one negative group of plates are sliding over each other. The size of the plates and their number PER cell determine the capacity of the battery.

59.	Which of the following is the electrolyte used in a lead-acid battery?(a) Nitric acid(b) Sulphuric acid(c) Lead-acid(d) Hydrochloric acidThis question was posed to me by my school principal while I was bunking the class.I want to ask this question from Lead-Acid Battery topic in chapter Storage Batteries of Automotive Engine Design
Answer» The correct answer is (b) Sulphuric acid For explanation I would say: The battery is filled with electrolyte. The electrolyte used in the lead-acid battery is a solution of sulphuric acid. It contains approximately one part of sulphuric acid to TWO part of water by VOLUME. It should be NOTED that acid should be added to water and not the VICE VERSA.

60.	Which is the active material present on the negative plate in a lead-acid battery?(a) Lead dioxide(b) Lead peroxide(c) Spongy lead(d) WaterI had been asked this question in exam.The doubt is from Lead-Acid Battery in portion Storage Batteries of Automotive Engine Design
Answer» The correct answer is (c) SPONGY lead To elaborate: The positive and negative electrodes of a lead-acid battery are IMMERSED in dilute SULPHURIC acid. On the positive PLATE, we have lead peroxide and on the negative plate, the active material is spongy lead.

61.	What is the percentage of acid and water present in the electrolyte of a lead-acid battery in a fully charged condition?(a) 39% acid and 61% water(b) 45% acid and 65% water(c) 30% acid and 70% water(d) 25% acid and 75% waterThe question was asked during an online interview.This intriguing question comes from Lead-Acid Battery topic in division Storage Batteries of Automotive Engine Design
Answer» The correct option is (a) 39% acid and 61% water The explanation is: The ELECTROLYTE in a lead-acid battery contains 39 percentage of acid and 61 percentage of water in a fully charged CONDITION. Whereas in the fully discharged condition it contains 85 percentage of water and 15 percentage of acid.