OBJECTIVE ELECTRICAL ENGINEERING PRIMARY AND SECONARY CELLS

1. Electric battery is a device 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 into electrical

energy Ans a

2. In a primary battery (a) Chemical action is reversible(b) Chemical action is irreversible (c) No chemical action take place(d) Chemical action takes place

Ans b3. Which one of the following is a primary

cell(a) Lead - acid cell(b) Daniel cell(c) Alkaline cell(d) Laclanche cell

Ans b4. In a secondary battery(a) Chemical action is reversible(b) Chemical action is irreversible(c) No chemical action takes place(d) Chemical takes place

Ans a5. Which one of the following is a

secondary cell(a) Daniel cell(b) Lead acid cell(c) Dry cell(d) Alkaline cell

Ans d6. Which cell is known as storage cell(a) Primary cell(b) Dry cell(c) Laclanche cell(d) Secondary cell

Ans d7. Active elements in a lead- acid battery

are(a) Nickel-hydrate and iron oxide(b) Lead peroxide and sponge lead(c) Magnnese dioxide and carbon(d) Sponge lead

Ans b8. Electrolyte used in lead- acid battery is(a) Sulphuric acid(b) Caustic potash(c) Magnese dioxide(d) Nitric acid

Ans a9. Specific gravity 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

Ans a11.Capacity of battery depends upon (a) Rate of discharge (b) It is independent (c) Ampere hour (d) Temperature

Ans a12.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 d13.Active elements of alkaline battery are(a) Lead peroxide and sponge lead(b) Nickle- hydrate and iron oxide(c) Magnese-dioxide and carbon

Ans b14.During discharge of a battery(a) The voltage of cell decrease(b) The voltage of cell increase(c) Voltage does not charge

Ans a15.The watt- hour efficiency is always (a) More than ampere hour efficiency (b) Equal to ampere-hour efficiency(c) Less than ampere-hour efficiency

Ans c16.The electrolyte used in edision cell is(a) Sulphuric acid(b) Potassium hydroxide(c) Nickel hydrate(d) Nitric acid

Ans b17.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 a18.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 d19.During charging of a battery, specific

gravity of electrolyte(a) Decrease(b) Increase(c) Does not change

Ans b

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OBJECTIVE ELECTRICAL ENGINEERING PRIMARY AND SECONARY CELLS

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 a21.The specific gravity of a charged cell(a) 1.25(b) 1.20(c) 1.10(d) 1.0

Ans a22.The sp. Gravity of electrolyte charged

cell is(a) 1.25(b) 1.2(c) 1.28(d) 1.30

Ans b23.The supply required for charge a lead

acid cell is(a) A.C(b) D.C(c) Pulsating D.C

Ans b24.The method of charging lead acid

cell(commercially) is(a) Constant current method(b) Constant voltage method(c) Constant resistance method

Ans b25.The colour of plates after discharging of

a battery will be(a) Red(b) Chocolate(c) Grayish(d) Yellowish

Ans c26.The colour of +ive plate of a battery

after charging will be(a) Black (b) Grayish(c) Chocolate(d) Yellowish

Ans c27.The colour of –ive plate of a battery

after charging will be(a) Black(b) Grey(c) Chocolate(d) Yellowish

Ans b28.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 by

(a) Hydrometer(b) Barometer(c) Lachometer(d) Cell tester

Ans a30.Which efficiency of the battery is more(a) Watt hour efficiency(b) Ampere hour efficiency(c) Overall efficiency

Ans b

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