MCQOPTIONS
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MCQOPTIONS
This section includes 107 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
______ of electrolyte indicates the state of charge of the battery |
| A. | colour |
| B. | mass |
| C. | viscosity |
| D. | specific gravity |
| Answer» E. | |
| 52. |
Negative plate of an Edison cell is made of__________? |
| A. | copper |
| B. | lead |
| C. | iron |
| D. | silver oxide |
| Answer» D. silver oxide | |
| 53. |
Mercury cell has which of the following characteristics ____________? |
| A. | Flat discharge current-voltage curve |
| B. | High power to weight ratio |
| C. | Comparatively longer shelf life under adverse conditions of high temperature and humidity |
| D. | All of the above |
| Answer» E. | |
| 54. |
Local action in a battery is indicated by____________? |
| A. | excessive gassing under load conditions |
| B. | excessive drop in the specific gravity of electrolyte even when the cell is on open circuit |
| C. | both A. and (b) |
| D. | none of the above |
| Answer» E. | |
| 55. |
Life of the Edison cell is at least_____________? |
| A. | five years |
| B. | seven years |
| C. | eight years |
| D. | ten years |
| Answer» B. seven years | |
| 56. |
Life of the batteries is in the following ascending order____________? |
| A. | Lead-acid cell, Edison cell, Nickel cadmium cell |
| B. | Lead-acid cell, Nickel-cadmium cell, Edison cell |
| C. | Edison cell, Nickel-cadmium cell, lead-acid cell |
| D. | Nickel-cadmium cell, Edison cell, lead-acid cell |
| Answer» B. Lead-acid cell, Nickel-cadmium cell, Edison cell | |
| 57. |
Level of electrolyte in a cell should be ________ the level of plates |
| A. | below |
| B. | equal to |
| C. | above |
| D. | none of the above |
| Answer» D. none of the above | |
| 58. |
Lead-acid cell has a life of nearly charges and discharges______________? |
| A. | 500 |
| B. | 700 |
| C. | 1000 |
| D. | 1250 |
| Answer» E. | |
| 59. |
It is noticed that durum charging___________? |
| A. | there is a rise in voltage |
| B. | energy is absorbed by the cell |
| C. | specific gravity of H2SO4 is increased |
| D. | the anode becomes chocolate brown in colour (PbCfe) and cathode becomes grey metallic lead (Pb) |
| E. | all of the above |
| Answer» F. | |
| 60. |
It is noticed that during discharging the following does not happen___________? |
| A. | both anode and cathode become PbS04 |
| B. | specific gravity of H2SO4 decreases |
| C. | voltage of the cell decreases |
| D. | the cell absorbs energy |
| Answer» E. | |
| 61. |
Internal short circuits are caused by___________? |
| A. | breakdown of one or more separators |
| B. | excess accumulation of sediment at the bottom of the cell |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» D. none of the above | |
| 62. |
Internal resistance of a cell is reduced by__________? |
| A. | using vent plug to permit gas formed during discharge |
| B. | increasing the plate area |
| C. | putting plates very close together |
| D. | all above methods |
| Answer» E. | |
| 63. |
Internal resistance of a cell is due to___________? |
| A. | resistance of electrolyte |
| B. | electrode resistance |
| C. | surface contact resistance between electrode and electrolyte |
| D. | all above |
| Answer» E. | |
| 64. |
In ________ system the charging current is intermittently controlled at either a maximum or minimum value |
| A. | two rate charge control |
| B. | trickle charge |
| C. | floating charge |
| D. | an equalizing charge |
| Answer» B. trickle charge | |
| 65. |
In order that a hydrometer may float vertically in electrolyte its C.G. should be___________? |
| A. | lowered |
| B. | raised |
| C. | undisturbed |
| D. | displaced sideways |
| Answer» B. raised | |
| 66. |
In constant voltage charging method, the charging current from discharged to fully charged condition_____________? |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | none of the above |
| Answer» B. increases | |
| 67. |
In constant-current charging method, the supply voltage from discharged to fully charged condition____________? |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | none of the above |
| Answer» C. remains constant | |
| 68. |
In alkaline cell the electrolyte is_____________? |
| A. | dilute sulphuric acid |
| B. | concentrated sulphuric acid |
| C. | NaOH |
| D. | KOH |
| Answer» E. | |
| 69. |
In a lead-acid cell, lead is called as____________? |
| A. | positive active material |
| B. | negative active material |
| C. | passive material |
| D. | none of the above |
| Answer» C. passive material | |
| 70. |
In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________? |
| A. | one part H2O, three parts H2SO4 |
| B. | two parts H2O, two parts H2SO4 |
| C. | three parts H2O, one part H2SO4 |
| D. | all H2S04 |
| Answer» D. all H2S04 | |
| 71. |
In a lead-acid battery the energy is stored in the form of___________? |
| A. | charged ions |
| B. | chemical energy |
| C. | electrostatic energy |
| D. | electromagnetic energy |
| Answer» C. electrostatic energy | |
| 72. |
In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________? |
| A. | to reduce evaporation of water from electrolyte |
| B. | to exclude dirt and foreign matter from the electrolyte |
| C. | to discharge both of the above functions |
| D. | to discharge none of the above functions |
| Answer» D. to discharge none of the above functions | |
| 73. |
If a lead-acid cell is discharged below 1.8 V the following will happen.____________? |
| A. | Capacity of cell will reduce |
| B. | Sulphation of plates will occur |
| C. | Internal resistance will increase |
| D. | All above will occur |
| Answer» E. | |
| 74. |
If a battery is wrongly connected on charge following will happen__________? |
| A. | current delivered by the battery will be high |
| B. | current drawing will be nil |
| C. | current drawing will be very small |
| D. | current drawing will be very high |
| Answer» E. | |
| 75. |
Hydrogen evolved during charging produces explosive mixture when it is more than___________? |
| A. | 2% |
| B. | 4% |
| C. | 6% |
| D. | 8% |
| Answer» E. | |
| 76. |
For a cell to work, which of the following condition(s) become necessary ___________? |
| A. | Two electrodes of different meta’s should be inserted in the electrolyte, not touching each other |
| B. | Electrolyte must chemically react with one of the electrodes |
| C. | Electrolyte liquid or paste should be conducting |
| D. | All above three conditions are necessary |
| Answer» E. | |
| 77. |
Following will occur if level of electrolyte falls below plates____________? |
| A. | capacity of the cell is reduced |
| B. | life of the cell is reduced |
| C. | open plates are converted to lead sulphate |
| D. | all above |
| Answer» E. | |
| 78. |
Following will happen if the specific gravity of electrolyte becomes more than 1.23 |
| A. | Loss of capacity |
| B. | Loss of life |
| C. | Corrosion of the grids of the plate |
| D. | All above |
| Answer» E. | |
| 79. |
Following will happen if battery charging rate is too high______________? |
| A. | excessive gassing will occur |
| B. | temperature rise will occur |
| C. | bulging and buckling of plates will occur |
| D. | all above will occur |
| Answer» E. | |
| 80. |
Five 2 V cells are connected in parallel. The output voltage is__________? |
| A. | 1 V |
| B. | 1.5 V |
| C. | 1.75 V |
| D. | 2 V |
| Answer» E. | |
| 81. |
Extent of corrosion in the underground metal work depends upon___________? |
| A. | amount of moisture |
| B. | type of metals |
| C. | type of soil chemicals |
| D. | all above factors |
| Answer» E. | |
| 82. |
Excessive formation of lead sulphate on the surface of the plates happens because of___________? |
| A. | allowing a battery to stand in discharged condition for a long time |
| B. | topping up with electrolyte |
| C. | persistent undercharging |
| D. | low level of electrolyte |
| E. | all above |
| Answer» F. | |
| 83. |
Excessive charging a battery tends to____________? |
| A. | produce gassing |
| B. | increase the internal resistance of the battery |
| C. | to corrode the positive plates into lead peroxide thereby weakening them physically |
| D. | bring about all above changes |
| Answer» E. | |
| 84. |
Electrolyte used in an Edison cell is___________? |
| A. | NaOH |
| B. | KOH |
| C. | HC1 |
| D. | HN03 |
| Answer» C. HC1 | |
| 85. |
Electrolyte used in a lead-acid cell is__________? |
| A. | NaOH |
| B. | onlyH2S04 |
| C. | only water |
| D. | dilute H2SO4 |
| Answer» E. | |
| 86. |
Each cell has a vent cap________? |
| A. | to allow gases out when the cell is on charge |
| B. | to add water to the cell if needed |
| C. | to check the level of electrolyte |
| D. | to do all above functions |
| Answer» E. | |
| 87. |
During the idle period of the battery, strong electrolyte tends to change the active material of the cell into____________? |
| A. | Pb02 |
| B. | PbSC-4 |
| C. | PbO |
| D. | Pb |
| Answer» C. PbO | |
| 88. |
During the charging of a lead-acid cell__________? |
| A. | its voltage increases |
| B. | it gives out energy |
| C. | its cathode becomes dark chocolate brown in colour |
| D. | specific gravity of H2SO4 decreases |
| Answer» B. it gives out energy | |
| 89. |
During the charging and discharging of a nickel-iron cell____________? |
| A. | corrosive fumes are produced |
| B. | water is neither formed nor absorbed |
| C. | nickel hydroxide remains unsplit |
| D. | its e.m.f. remains constant |
| Answer» C. nickel hydroxide remains unsplit | |
| 90. |
During discharge, the active material of both the positive and negative plates is changed to___________? |
| A. | Pb |
| B. | Pb02 |
| C. | PbO |
| D. | PbS04 |
| Answer» E. | |
| 91. |
Dry cell is modification of____________? |
| A. | Deniell cell |
| B. | Leclanche cell |
| C. | Lead-acid cell |
| D. | Edison cell |
| Answer» C. Lead-acid cell | |
| 92. |
Charging of sulfated battery produces _________ heat |
| A. | no |
| B. | very little |
| C. | less |
| D. | more |
| Answer» E. | |
| 93. |
Charging a sulphated battery at high rate results in___________? |
| A. | boiling of electrolyte due to gassing |
| B. | warping of plates |
| C. | damage to separators, cell caps covers and battery case due to excessive temperature |
| D. | all above |
| Answer» E. | |
| 94. |
Cells are connected in parallel to__________? |
| A. | increase the efficiency |
| B. | increase the current capacity |
| C. | increase the voltage output |
| D. | increase the internal resistance |
| Answer» C. increase the voltage output | |
| 95. |
Cells are connected in series in order to_____________? |
| A. | increase the voltage rating |
| B. | increase the current rating |
| C. | increase the life of the cells |
| D. | none of the above |
| Answer» B. increase the current rating | |
| 96. |
Cell short circuit results in_________? |
| A. | low sp. gravity electrolyte |
| B. | abnormal high temperature |
| C. | reduced gassing on charge |
| D. | all above |
| Answer» E. | |
| 97. |
Capacity of dry cells is_________? |
| A. | more when it is supplying current for intermittent periods |
| B. | more when it is supplying current for continuous periods |
| C. | unaffected by the type of discharge |
| D. | none of the above |
| Answer» B. more when it is supplying current for continuous periods | |
| 98. |
Battery container should be acid resistance, therefore it is made up of___________? |
| A. | glass |
| B. | plastic |
| C. | wood |
| D. | all above |
| Answer» E. | |
| 99. |
Battery charging equipment is generally installed______________? |
| A. | in well ventilated location |
| B. | in clean and dry place |
| C. | as near as practical to the battery being charged |
| D. | in location having all above features |
| Answer» E. | |
| 100. |
Batteries are charged by_____________? |
| A. | rectifiers |
| B. | engine generator sets |
| C. | motor generator sets |
| D. | any one of the above methods |
| Answer» E. | |