180 Important Electrolysis and Storage Batteries MCQ Question and Answer | PDF Free Download
1.In alkaline cell the electrolyte is
- Adilute sulphuric acid
- Bconcentrated sulphuric acid
- CNaOH
- DKOH
2.Self-charge of a Ni-Fe cell is __________ Edison cell
- AEqual to
- BLess than
- CMore than
- DMuch more than
4.to prevent local action in battery, only ............is used in electrolytes
- APump water
- BDistilled water
- CTap water
- DCombination of (a) and (c)
5.Even though voltage of the dry cell, big or small is 1.5 V, small cell delivers less current because it has comparatively __________ internal resistance.
- AZero
- BLess
- CMore
- DSame
6.Ampere hour capacity of an industrial battery is based on __________ hour discharge rate.
- A8
- B12
- C16
- D24
7.The body of Edison cell is made of
- ABakelite
- BRubber
- CNickel plate steel
- DAluminium
8.Specific gravity of electrolyte in Edison is
- A0.8
- B0.95
- C1.1
- D1.21
9.All the electrical connections between the battery and vehicle should be by
- AThin aluminium wire
- BThin copper wire
- CRigid cables
- DFlexible cables
10.A battery of 6 cells will show a drop of __________ volts from fully charged state to fully discharged state.
- A1.0
- B1.5
- C2.4
- D2.9
11.Charging of sulphated battery produces _________ heat
- ANo
- BVery little
- CLess
- DMore
12.Hydrogen evolved during charging produces explosive mixture when it is more than
- A2 %
- B4 %
- C6 %
- D8 %
13.Weston standard cell at 20 ? C has voltage of __________ volts
- A0.8
- B0.9
- C1.0187
- D1.5
14.When two cells of unequal voltages are in parallel, the e.m.f of the combination is equal to the e.m.f of the ___________ cell
- ASmall
- BLarge
- CAny of the above
- DNone of the above
15.Battery charging room is to be kept well ventilated so as to reduce the hydrogen concentration below ___________ percent.
- AOne
- BTwo
- CThree
- DFour
16.Extent of corrosion in the underground metal work depends upon
- AAmount of moisture
- BType of metals
- CType of soil chemicals
- DAll above factors
17.Mercury cell has which of the following characteristics ?
- AFlat discharge current-voltage curve
- BHigh power to weight ratio
- CComparatively longer shelf life under adverse conditions of high temperature and humidity
- DAll of the above
18.To avoid freezing in cold weather, sp. Gravity of electrolyte of lead-acid cell should be kept above
- A1.1
- B1.2
- C1.225
- D1.3
19.Charging a sulphated battery at high rate results in
- ABoiling of electrolyte due to gassing
- BWarping of plates
- CDamage to separators, cell caps covers and battery case due to excessive temperature
- D All above
20.In a battery cover is placed over the element and sealed to the top of the battery container. This is done
- ATo reduce evaporation of water from electrolyte
- BTo exclude dirt and foreign matter from the electrolyte
- CTo discharge both the above functions
- DTo discharge none of the above functions