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OBJECTIVE ELECTRICAL ENGINEERING
PRIMARY AND SECONARY CELLS
1. Electric battery is a device that that (a) Generate e.m.f by chemical action (b) Converts mechanical energy into electrical energy (c) Converts heat energy into electrical energy (d) Converts sound energy energy into electrical electrical energy Ans a 2. In a primary battery (a) Chemical action is reversible reversible (b) Chemical action is irreversible irreversible (c) No chemical action take take place (d) Chemical action action takes place Ans b 3. Which one of the following is a primary cell (a) Lead - acid cell (b) Daniel cell (c) Alkaline cell (d) Laclanche cell Ans b 4. In a secondary battery (a) Chemical action is reversible reversible (b) Chemical action is irreversible irreversible (c) No chemical action takes takes place (d) Chemical takes place place Ans a 5. Which one of the following is a secondary cell (a) Daniel cell (b) Lead acid cell (c) Dry cell (d) Alkaline cell Ans d 6. Which cell is known known a s storage storage cell (a) Primary cell (b) Dry cell (c) Laclanche cell (d) Secondary cell Ans d 7. Active elements elements in a lead lead - acid battery battery are (a) Nickel-hydrate and and iron oxide (b) Lead peroxide and sponge lead (c) Magnnese dioxide and and carbon (d) Sponge lead Ans b 8. Electrolyte used in lead - acid battery is (a) Sulphuric acid (b) Caustic potash potash (c) Magnese dioxide (d) Nitric acid Ans a 9. Specific gravity gravity of of electrolyte (a) Increase (b) De crease (c) Remain the same When the temperature is increased Ans b 10. The capacity of a battery is expressed in (a) Ampere ±hour (b) Ampere-volt (c) Percentage (d) Volts Page 1
Ans a 11. Capacity of battery depends upon (a) Rate of discharge (b) It is independent (c) Ampere hour (d) Temperature Ans a 12. The e.m.f. of a dry cell is (a) 1.08 volts (b) 2.0 volts (c) 1.2 volts (d) 1.5 volts Ans d 13. Active elements of alkaline battery are (a) Lead peroxide and sponge lead (b) NickleNickl e- hydrate and and iron oxide (c) Magnese-dioxide Magnese -dioxide and carbon Ans b 14. During discharge discharge of a battery (a) The voltage of cell decrease (b) The voltage of of cell increase (c) Voltage does not charge Ans a 15. The watt- hour efficiency efficiency is always (a) More than ampere hour efficiency (b) Equal to ampere-hour efficiency (c) Less than ampere-hour efficiency efficienc y Ans c 16. The electrolyte used in edision cell is (a) Sulphuric acid (b) Potassium hydroxide (c) Nickel hydrate (d) Nitric acid Ans b 17. Internal resistance per cell of lead acid cell is always (a) Less than edision cell (b) More than edision cell (c) Equal to edision cell Ans a 18. Average e.m.f. per cell of lead acid cell is (a) 1.2 V (b) 1.08 V (c) 1.5 V (d) 2.2 V Ans d 19. During charging of a battery, specific gravity of electrolyte (a) Decrease (b) Increase (c) Does not change Ans b 20. When the weight of an ion librated during electrolysis is increased the quantity of electricity produced (a) Increase (b) Decrease (c) Remain the same Ans a 21. The specific gravity of a charged cell (a) 1.25
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OBJECTIVE ELECTRICAL ENGINEERING
(b) 1.20 (c) 1.10 (d) 1.0 Ans a 22. The sp. Gravity of electrolyte charged cell is (a) 1.25 (b) 1.2 (c) 1.28 (d) 1.30 Ans b 23. The supply required for charge a lead acid cell is (a) A.C (b) D.C (c) Pulsating D.C Ans b 24. The method of charging lead acid cell(commercially) cell(commercially) is (a) Constant current method (b) Constant voltage method (c) Constant resistance method Ans b 25. The colour of plates after discharging of a battery will be (a) Red (b) Chocolate (c) Grayish (d) Yellowish Ans c 26. The colour of +ive plate of a battery after charging will be (a) Black (b) Grayish (c) Chocolate (d) Yellowish Ans c 27. The colour of ±ive plate of a battery after charging will be (a) Black (b) Grey (c) Chocolate (d) Yellowish Ans b 28. The condition of the battery can be determined by (a) Voltmeter (b) High rate discharger (c) Lactometer (d) Cell tester Ans b 29. The sp. Gravity of the electrolyte is measured
