[amp_mcq option1=”dilute sulphuric acid” option2=”concentrated sulphuric acid” option3=”NaOH” option4=”kOH” correct=”option4″]
Electrolysis and storage of batteries
82. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following
[amp_mcq option1=”One part H2O, three parts H2SO4″ option2=”Two parts H2O, two parts H2SO4″ option3=”Three parts H2O, one part H2SO4″ option4=”All H2SO4″ correct=”option2″]
83. The e.m.f. of an Edison cell, when fully charged, is nearly
[amp_mcq option1=”1.4 V” option2=”1 V” option3=”0.9 V” option4=”0.8 V” correct=”option1″]
Detailed SolutionThe e.m.f. of an Edison cell, when fully charged, is nearly
84. The active materials on the positive and negative plates of a fully charged lead-acid battery are
[amp_mcq option1=”lead and lead peroxide” option2=”lead sulphate and lead” option3=”lead peroxide and lead” option4=”none of the above” correct=”option1″]
85. Charging a sulphated battery at high rate results in
[amp_mcq option1=”boiling of electrolyte due to gassing” option2=”warping of plates” option3=”damage to separators, cell caps covers and battery case due to excessive temperature” option4=”all above” correct=”option4″]
Detailed SolutionCharging a sulphated battery at high rate results in
86. Dry cell is modification of
[amp_mcq option1=”Deniell cell” option2=”Leclanche cell” option3=”Lead-acid cell” option4=”Edison cell” correct=”option2″]
87. Ampere hour capacity of an industrial battery is based on ____ hours discharge rate.
[amp_mcq option1=”8″ option2=”12″ option3=”16″ option4=”24″ correct=”option3″]
88. The storage battery generally used in electric power station is
[amp_mcq option1=”nickel-cadmium battery” option2=”zinc-carbon battery” option3=”lead-acid battery” option4=”none of the above” correct=”option3″]
Detailed SolutionThe storage battery generally used in electric power station is
89. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
[amp_mcq option1=”reducing time of charging” option2=”increasing cell capacity” option3=”both (A) and (B)” option4=”avoiding excessive gassing” correct=”option3″]
90. When two batteries are connected in parallel, it should be ensured that
[amp_mcq option1=”they have same e.m.f.” option2=”they have same make” option3=”they have same ampere-hour capacity” option4=”they have identical internal resistance” correct=”option4″]
Detailed SolutionWhen two batteries are connected in parallel, it should be ensured that