MCQOPTIONS
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MCQOPTIONS
This section includes 198 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
%_The storage battery generally used in electric power station is_% |
| A. | nickel-cadmium battery |
| B. | zinc-carbon battery |
| C. | lead-acid battery |
| D. | none of the above |
| Answer» D. none of the above | |
| 102. |
%_Ampere hour capacity of an industrial battery is based on ____ hours discharge rate._% |
| A. | 8 |
| B. | 12 |
| C. | 16 |
| D. | 24 |
| Answer» B. 12 | |
| 103. |
%_A constant-voltage generator has_% |
| A. | minimum efficiency |
| B. | minimum current capacity |
| C. | low internal resistance |
| D. | high internal resistance |
| Answer» D. high internal resistance | |
| 104. |
%_Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as______materials._% |
| A. | passive |
| B. | active |
| C. | redundant |
| D. | inert |
| Answer» C. redundant | |
| 105. |
%_When a lead-acid battery is in fully charged condition, the color of its positive plate is_% |
| A. | dark grey |
| B. | brown |
| C. | dark brown |
| D. | none of above |
| Answer» D. none of above | |
| 106. |
%_Specific gravity of electrolyte in Edison cell is_% |
| A. | 0.8 |
| B. | 0.95 |
| C. | 1.1 |
| D. | 1.21 |
| Answer» E. | |
| 107. |
_ If a lead-acid cell is discharged below 1.8 V the following will happen.$? |
| A. | Capacity of cell will reduce |
| B. | Sulphation of plates will occur |
| C. | Internal resistance will increase |
| D. | All above will occur |
| Answer» E. | |
| 108. |
_ The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is$? |
| A. | just one |
| B. | always greater than one |
| C. | always less than one |
| D. | none of the above |
| Answer» C. always less than one | |
| 109. |
_ The capacity of a battery is expressed in terms of$? |
| A. | current rating |
| B. | voltage rating |
| C. | ampere-hour rating |
| D. | none of the above |
| Answer» D. none of the above | |
| 110. |
_ Following will happen if battery charging rate is too high$? |
| 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. | |
| 111. |
__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. | |
| 112. |
_________ of electrolyte indicates the state of charge of the battery__ |
| A. | colour |
| B. | mass |
| C. | viscosity |
| D. | specific gravity |
| Answer» E. | |
| 113. |
__Batteries are charged by__ |
| A. | rectifiers |
| B. | engine generator sets |
| C. | motor generator sets |
| D. | any one of the above methods |
| Answer» E. | |
| 114. |
__The capacity of a lead-acid cell is measured in__ |
| A. | amperes |
| B. | ampere-hours |
| C. | watts |
| D. | watt-hours |
| Answer» C. watts | |
| 115. |
__Dry cell is modification of__ |
| A. | Deniell cell |
| B. | Leclanche cell |
| C. | Lead-acid cell |
| D. | Edison cell |
| Answer» C. Lead-acid cell | |
| 116. |
__The effect of sulphation is that the internal resistance__ |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the above |
| Answer» B. decreases | |
| 117. |
__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 H‚ÇÇSO‚ÇÑ decreases |
| Answer» B. it gives out energy | |
| 118. |
__The following indicate that battery on charge has attained full charge__ |
| A. | colour of electrode |
| B. | gassing |
| C. | specific gravity |
| D. | all above |
| Answer» E. | |
| 119. |
__Persons preparing electrolyte should wear__ |
| A. | goggles or other face shield |
| B. | rubber |
| C. | rubber boots and gloves |
| D. | all above safety devices |
| Answer» E. | |
| 120. |
__The current flow through electrolyte is due to the movement of__ |
| A. | ions |
| B. | holes |
| C. | electrons |
| D. | none of the above |
| Answer» B. holes | |
| 121. |
__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 | |
| 122. |
__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 | |
| 123. |
__When two batteries are connected in parallel, it should be ensured that__ |
| A. | they have same e.m.f. |
| B. | they have same make |
| C. | they have same ampere-hour capacity |
| D. | they have identical internal resistance |
| Answer» B. they have same make | |
| 124. |
__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. | |
| 125. |
__The charge required to liberate one gram equivalent of any substance is known as ______ constant__ |
| A. | Time |
| B. | Faraday’s |
| C. | Boltzman |
| D. | none of the above |
| Answer» C. Boltzman | |
| 126. |
__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 | |
| 127. |
__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 | |
| 128. |
_The substances which combine together to store electrical energy during the charge are called ______ materials$? |
| A. | active |
| B. | passive |
| C. | inert |
| D. | dielectric |
| Answer» B. passive | |
| 129. |
_While preparing electrolyte for a lead-acid battery$? |
| A. | water is poured into acid |
| B. | acid is poured into water |
| C. | anyone of the two can be added to other chemical |
| D. | none of the above |
| Answer» C. anyone of the two can be added to other chemical | |
| 130. |
_It is noticed that during discharging the following does not happen$? |
| A. | both anode and cathode become PbS04 |
| B. | specific gravity of H?SO? decreases |
| C. | voltage of the cell decreases |
| D. | the cell absorbs energy |
| Answer» E. | |
| 131. |
_Mercury cell has which of the following characteristics?$? |
| 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. | |
| 132. |
Five 2 V cells are connected in parallel. The output voltage is$? |
| A. | 1 V |
| B. | 1.5 V |
| C. | 1.75 V |
| D. | 2 V |
| Answer» E. | |
| 133. |
Excessive charging a battery tends to$? |
| 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. | |
| 134. |
On overcharging a battery$? |
| A. | It will bring about chemical change in active materials |
| B. | It will increase the capacity of the battery |
| C. | It will raise the specific gravity of the electrolyte |
| D. | None of the above will occur |
| Answer» E. | |
| 135. |
Each cell has a vent cap$? |
| 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. | |
| 136. |
As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its$? |
| A. | compactness |
| B. | lower e.m.f. |
| C. | small quantity of electrolyte used |
| D. | higher internal resistance |
| Answer» E. | |
| 137. |
Battery charging equipment is generally installed$? |
| 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. | |
| 138. |
Internal resistance of a cell is due to$? |
| A. | resistance of electrolyte |
| B. | electrode resistance |
| C. | surface contact resistance between electrode and electrolyte |
| D. | all above |
| Answer» E. | |
| 139. |
Lead-acid cell has a life of nearly charges and discharges$? |
| A. | 500 |
| B. | 700 |
| C. | 1000 |
| D. | 1250 |
| Answer» E. | |
| 140. |
Capacity of dry cells is$? |
| A. | more when it is supplying current for intermittent periods |
| B. | more when it is supplying current for continuous periods |
| C. | unaffected by the type of discharge |
| D. | none of the above |
| Answer» B. more when it is supplying current for continuous periods | |
| 141. |
Which of the following factors adversely affects the capacity of the leadacid battery ?$? |
| A. | Temperature of surroundings |
| B. | Specific gravity of electrolyte |
| C. | Rate of discharge |
| D. | All of the above |
| Answer» E. | |
| 142. |
During charging the specific gravity of the electrolyte of a lead-acid battery$? |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | becomes zero |
| Answer» B. decreases | |
| 143. |
Hydrogen evolved during charging produces explosive mixture when it is more than$? |
| A. | 2% |
| B. | 4% |
| C. | 6% |
| D. | 8% |
| Answer» E. | |
| 144. |
Weston standard cell at 20°C has voltage of ____ volts.$? |
| A. | 0.8 |
| B. | 0.9 |
| C. | 1.0187 |
| D. | 1.5 |
| Answer» D. 1.5 | |
| 145. |
In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following$? |
| A. | one part H2O, three parts H‚ÇÇSO‚ÇÑ |
| B. | two parts H2O, two parts H‚ÇÇSO‚ÇÑ |
| C. | three parts H2O, one part H‚ÇÇSO‚ÇÑ |
| D. | all H‚ÇÇSO‚ÇÑ |
| Answer» D. all H‚Äö√á√áSO‚Äö√á√ë | |
| 146. |
Battery container should be acid resistance, therefore it is made up of$? |
| A. | glass |
| B. | plastic |
| C. | wood |
| D. | all above |
| Answer» E. | |
| 147. |
When the load resistance equals the generator resistance which of the following will be maximum ?$? |
| A. | Current |
| B. | Efficiency of the circuit |
| C. | Power in the load resistance |
| D. | Voltage across the load resistance |
| Answer» D. Voltage across the load resistance | |
| 148. |
In ______ system the charging current is intermittently controlled at either a maximum or minimum value$? |
| A. | two rate charge control |
| B. | trickle charge |
| C. | floating charge |
| D. | an equalizing charge |
| Answer» B. trickle charge | |
| 149. |
Which of the following primary cells has the lowest voltage ?$? |
| A. | Lithium |
| B. | Zinc-chloride |
| C. | Mercury |
| D. | Carbon-zinc |
| Answer» D. Carbon-zinc | |
| 150. |
The output voltage of a charger is$? |
| A. | less than the battery voltage |
| B. | higher than the battery voltage |
| C. | the same as the battery voltage |
| D. | none of the above |
| Answer» C. the same as the battery voltage | |