View
116
Download
0
Category
Preview:
Citation preview
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
Page 1
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
Page 2
Recommended