Automobile Engineering MCQ with Answers

126) The instrument used to check specific gravity of acid in a battery is

Answer is:

hydrometer

Explanation:

Hydrometer is an instrument used to measure the specific gravity or relative density of liquids, i.e. the ratio of the density of the liquid to the density of water. Hydrometers are usually made of glass and consists of a cylindrical stem and a bulb weighted with a heavy material to make it float upright

The instrument used to check specific gravity of acid in a battery is

127) The negative terminal post on the top of a battery is

Answer is:

smaller than the positive terminal post

128) With the increase of battery temperature, the specific gravity of electrolyte

Answer is:

decreases

129) A battery can be charged by

Answer is:

applying voltage in the reverse direction to that of charging

130) The main characteristics of a maintenance free (MF) battery is that

a maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid

a maintenance free battery has a relatively short shelf life when compared with standard batteries

since it is sealed, the water in a maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water

recharging of a maintenance free battery is neither required nor possible

Answer is:

since it is sealed, the water in a maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water