electrolysis and storage of batteries Mcqs
101. Batteries are charged by_____________?
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A. rectifiers

B. any one of the above methods

C. engine generator sets

D. motor generator sets

102. The ampere-hour efficiency of a lead acid cell is normally between_________?
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A. 40 to 50%

B. 20 to 30%

C. 90 to 95%

D. 60 to 70%

103. When a lead-acid battery is in fully charged condition, the color of its positive plate is__________?
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A. brown

B. none of above

C. dark grey

D. dark brown
104. Charging a sulphated battery at high rate results in___________?
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A. all above

B. damage to separators, cell caps covers and battery case due to excessive temperature

C. warping of plates

D. boiling of electrolyte due to gassing

105. Undercharging___________?
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A. increases specific gravity of the electrolyte

B. increases the temperature

C. reduces specific gravity of the electrolyte

D. produces excessive gassing

106. During the charging and discharging of a nickel-iron cell____________?
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A. corrosive fumes are produced

B. its e.m.f. remains constant

C. water is neither formed nor absorbed

D. nickel hydroxide remains unsplit

107. The storage battery generally used in electric power station is__________?
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A. lead-acid battery

B. nickel-cadmium battery

C. zinc-carbon battery

D. none of the above

108. Satellite power requirement is provided through________?
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A. dry cells

B. solar cells

C. nickel-cadmium cells

D. lead-acid batteries

109. During the idle period of the battery, strong electrolyte tends to change the active material of the cell into____________?
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A. PbO

B. PbSC-4

C. Pb02

D. Pb

110. Electrolyte used in an Edison cell is___________?
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A. HN03

B. NaOH

C. HC1

D. KOH
111. Which of the following cell has a. reversible chemical reaction ___________?
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A. Carbon-zinc

B. Silver-oxide

C. Mercury oxide

D. Lead-acid
112. Which of the following primary cells has the lowest voltage_________ ?
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A. Lithium

B. Zinc-chloride

C. Mercury

D. Carbon-zinc

113. In a lead-acid battery the energy is stored in the form of___________?
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A. chemical energy

B. electromagnetic energy

C. charged ions

D. electrostatic energy

114. A battery of 6 cells will show a drop of _______ volts from fully charged state to fully discharged state
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A. 1

B. 2.4

C. 2.9

D. 1.5

115. A constant-voltage generator has___________?
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A. low internal resistance

B. high internal resistance

C. minimum efficiency

D. minimum current capacity

116. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?
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A. one part H2O, three parts H2SO4

B. three parts H2O, one part H2SO4

C. all H2S04

D. two parts H2O, two parts H2SO4

117. The common impurity in the electrolyte of lead-acid battery is_____________?
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A. chlorine

B. dust particles

C. lead crystals

D. iron
118. The capacity of a lead-acid cell does not depend on its___________?
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A. rate of charge

B. temperature

C. quantity of active material

D. rate of discharge

119. Battery container should be acid resistance, therefore it is made up of___________?
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A. glass

B. wood

C. all above

D. plastic