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.
| 1. |
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 |
| Answer» C. anyone of the two can be added to other chemical | |
| 2. |
Which of the following primary cells has the lowest voltage_________ ? |
| A. | Lithium |
| B. | Zinc-chloride |
| C. | Mercury |
| D. | Carbon-zinc |
| Answer» D. Carbon-zinc | |
| 3. |
Which of the following primary cells has the highest voltage___________ ? |
| A. | Manganese-alkaline |
| B. | Carbon-zinc |
| C. | Lithium |
| D. | Mercury |
| Answer» D. Mercury | |
| 4. |
Which of the following has lower specific gravity V__________? |
| A. | Dilute H2S04 |
| B. | Concentrated H2SO4 |
| C. | Water |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 5. |
Which of the following cell has a. reversible chemical reaction ___________? |
| A. | Lead-acid |
| B. | Mercury oxide |
| C. | Carbon-zinc |
| D. | Silver-oxide |
| Answer» B. Mercury oxide | |
| 6. |
Which of the following battery is used for air-craft _____________? |
| A. | Lead-acid battery |
| B. | Nickel-iron battery |
| C. | Dry cell battery |
| D. | Silver oxide battery |
| Answer» C. Dry cell battery | |
| 7. |
Which among the following constitutes the major load for an automobile battery _________? |
| A. | Brake light |
| B. | Self starter |
| C. | Parking lights |
| D. | Spark plugs |
| Answer» C. Parking lights | |
| 8. |
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 | |
| 9. |
When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in___________? |
| A. | charged state |
| B. | discharged state |
| C. | both (A) and (B) |
| D. | active state |
| Answer» C. both (A) and (B) | |
| 10. |
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 | |
| 11. |
When the lead-acid cell is fully charged, the electrolyte assumes _______ appearance |
| A. | dull |
| B. | reddish |
| C. | bright |
| D. | milky |
| Answer» E. | |
| 12. |
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 | |
| 13. |
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 | |
| 14. |
Undercharging___________? |
| A. | reduces specific gravity of the electrolyte |
| B. | increases specific gravity of the electrolyte |
| C. | produces excessive gassing |
| D. | increases the temperature |
| Answer» B. increases specific gravity of the electrolyte | |
| 15. |
Under normal charging rate, the charging current should be__________? |
| A. | 10% of capacity |
| B. | 20% of capacity |
| C. | 30% of capacity |
| D. | 40% of capacity |
| Answer» B. 20% of capacity | |
| 16. |
Trickle charging of a storage battery helps to___________? |
| A. | maintain proper electrolyte level |
| B. | increase its reserve capacity |
| C. | prevent sulphation |
| D. | keep it fresh and fully charged |
| Answer» E. | |
| 17. |
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 | |
| 18. |
The watt-hour efficiency of a lead-acid cell varies between________? |
| A. | 25 to 35% |
| B. | 40 to 60% |
| C. | 70 to 80% |
| D. | 90 to 95% |
| Answer» D. 90 to 95% | |
| 19. |
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 | |
| 20. |
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 | |
| 21. |
The specific gravity of electrolyte is measured by____________? |
| A. | manometer |
| B. | a mechanical gauge |
| C. | hydrometer |
| D. | psychrometer |
| Answer» D. psychrometer | |
| 22. |
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 | |
| 23. |
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 | |
| 24. |
The open circuit voltage of any storage cell depends wholly upon___________? |
| A. | its chemical constituents |
| B. | on the strength of its electrolyte |
| C. | its temperature |
| D. | all above |
| Answer» E. | |
| 25. |
The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with____________? |
| A. | Newton’s law |
| B. | Faraday’s law of electromagnetic |
| C. | Faraday’s law of electrolysis |
| D. | Gauss’s law |
| Answer» D. Gauss’s law | |
| 26. |
The lead-acid cell should never be discharged beyond____________? |
| A. | 1.8 V |
| B. | 1.9 V |
| C. | 2 V |
| D. | 2.1 V |
| Answer» B. 1.9 V | |
| 27. |
The internal resistance of a lead-acid cell is that of Edison cell____________? |
| A. | less than |
| B. | more than |
| C. | equal to |
| D. | none of the above |
| Answer» B. more than | |
| 28. |
The internal resistance of an alkali cell is nearly _________ times that of the lead-acid cell |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» E. | |
| 29. |
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. | |
| 30. |
The e.m.f. of an Edison cell, when fully charged, is nearly______________? |
| A. | 1.4 V |
| B. | 1 V |
| C. | 0.9 V |
| D. | 0.8 V |
| Answer» B. 1 V | |
| 31. |
The effect of sulphation is that the internal resistance__________? |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the above |
| Answer» B. decreases | |
| 32. |
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 | |
| 33. |
The common impurity in the electrolyte of lead-acid battery is_____________? |
| A. | chlorine |
| B. | dust particles |
| C. | lead crystals |
| D. | iron |
| Answer» E. | |
| 34. |
The charge required to liberate one gram equivalent of any substance is known as _________ constant |
| A. | time |
| B. | Faraday’s |
| C. | Boltzman |
| Answer» C. Boltzman | |
| 35. |
The capacity of a lead-acid cell is measured in_____________? |
| A. | amperes |
| B. | ampere-hours |
| C. | watts |
| D. | watt-hours |
| Answer» C. watts | |
| 36. |
The capacity of a lead-acid cell does not depend on its___________? |
| A. | temperature |
| B. | rate of charge |
| C. | rate of discharge |
| D. | quantity of active material |
| Answer» C. rate of discharge | |
| 37. |
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 | |
| 38. |
The body of Edison cell is made of___________? |
| A. | bakelite |
| B. | rubber |
| C. | nickel plated steel |
| D. | aluminium |
| Answer» D. aluminium | |
| 39. |
The best indication about the state of charge on a lead-acid battery is given by____________? |
| A. | output voltage |
| B. | temperature of electrolyte |
| C. | specific gravity of electrolyte |
| D. | none of the above |
| Answer» D. none of the above | |
| 40. |
The average charging voltage for alkali cell is about__________? |
| A. | 1 V |
| B. | 1.2 V |
| C. | 1.7 V |
| D. | 2.1 V |
| Answer» D. 2.1 V | |
| 41. |
The ampere-hour efficiency of a lead acid cell is normally between_________? |
| A. | 20 to 30% |
| B. | 40 to 50% |
| C. | 60 to 70% |
| D. | 90 to 95% |
| Answer» E. | |
| 42. |
The active materials on the positive and negative plates of a fully charged lead-acid battery are_______? |
| A. | lead and lead peroxide |
| B. | lead sulphate and lead |
| C. | lead peroxide and lead |
| D. | none of the above |
| Answer» D. none of the above | |
| 43. |
The active material of the positive plates of silver-zinc batteries is_________? |
| A. | silver oxide |
| B. | lead oxide |
| C. | lead |
| D. | zinc powder |
| Answer» B. lead oxide | |
| 44. |
The active materials of a nickel-iron battery are___________? |
| A. | nickel hydroxide |
| B. | powdered iron and its oxide |
| C. | 21% solution of KOH |
| D. | all of the above |
| Answer» E. | |
| 45. |
Satellite power requirement is provided through________? |
| A. | solar cells |
| B. | dry cells |
| C. | nickel-cadmium cells |
| D. | lead-acid batteries |
| Answer» B. dry cells | |
| 46. |
Petroleum jelly is applied to the electrical connections to the lead-acid battery___________? |
| A. | prevent local heating |
| B. | prevent short-circuiting |
| C. | reduce path resistance |
| D. | prevent corrosion |
| Answer» E. | |
| 47. |
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. | |
| 48. |
Over charging______________? |
| A. | produces excessive gassing |
| B. | loosens the active material |
| C. | increases the temperature resulting in buckling of plates |
| D. | all above |
| Answer» E. | |
| 49. |
On the average the ampere-hour efficiency of an Edison cell is about__________? |
| A. | 40% |
| B. | 60% |
| C. | 70% |
| D. | 80% |
| Answer» E. | |
| 50. |
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. | |