ELECTRICIAN 1st YEAR MODULE – Cell and Batteries

Question 1 of 39

1. How is local action defect prevented in voltaic cell?

Connecting cells in parallel

Amalgamating zinc plate

Connecting cells in series

Using depolarizing agent

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Question 2 of 39

2. What is the formula for Faraday's first law of electrolysis?

M = it/Z

M = Z/it

M = Zit

M = Zt/i

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Question 3 of 39

3. What causes buckling defect in lead acid batteries?

Overcharging or over discharging

Formation of sediments falling from plates

Keeping battery discharged for long periods

Charging with low rate for short period

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Question 4 of 39

4. Which is used as an electrolyte in lead acid battery?

Potassium hydroxide

Ammonium chloride

Diluted sulphuric acid

Hydrochloric acid

Question 4 of 39

Question 5 of 39

5. QUESTION: Which electrolyte used in carbon zinc dry cells?

Ammonium chloride

Dilute sulphuric acid

Concentrated hydrochloric acid

Potassium hydroxide

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Question 6 of 39

6. What is the total voltage of the circuit?

7.5 Volt

9.0 Volt

1.5 Volt

6.0 Volt

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Question 7 of 39

7. What is the purpose of separator in lead acid battery?

To avoid short between positive and negative plates

To hold the positive and negative plate firmly

To provide a path for electrolyte

To keep positive and negative plate in sequence array

Question 7 of 39

Question 8 of 39

8. QUESTION: What is the unit of electric charge?

Watt

Ampere

Coulomb

Volt

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Question 9 of 39

9. QUESTION: Which cell is most often used in digital watches?

Voltaic

Lithium

Mercury

Silver oxide

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Question 10 of 39

10. QUESTION: Which device converts sunlight into electrical energy?

Light emitting diode

Light dependent resistor

Photo voltaic cell

Liquid crystal diode

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Question 11 of 39

11. What is the effect if one cell is connected with reverse polarity in a parallel combination circuit?

Will get short circuited

Voltage become zero

Become open circuit

No effect will function normally

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Question 12 of 39

12. What is the Electro Chemical Equivalent (ECE) of copper?

1.1182 mg/coulomb

1.1182 g/coulomb

0.329 g/coulomb

0.329 mg/coulomb

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Question 13 of 39

13. QUESTION: How the capacity of batteries is specified?

Watt

Volt

Volt Ampere

Ampere hour

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Question 14 of 39

14. Which apparatus checks battery charging voltage condition?

Voltmeter

Hydrometer

High rate discharge tester

Multimeter

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Question 15 of 39

15. How the hard sulphation defect in lead acid battery can be rectified?

Changing with new electrolyte

Replacing with new electrodes

Recharging the battery for short period at high current

Recharging the battery for a longer period at low current

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Question 16 of 39

16. What is the total output voltage of the circuit?

4.5 V

0 V

1.5 V

3.0 V

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Question 17 of 39

17. Which part loses electrons during electrolysis?

Anode

Separator

Electrolyte

Cathode

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Question 18 of 39

18. What is the outcome at the positive plate, after the chemical reaction in lead acid battery during charging?

Sponge lead (Pb)

Lead sulphate(PbSO4)

Lead sulphate + water

Lead peroxide(PbO2)

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Question 19 of 39

19. What does 'Z' represent in formula M=Z/it?

Mass deposited in grams

Time in seconds

Current in Amperes

E.C.E of electrolyte

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Question 20 of 39

20. What is the function of fine selector switch in battery charger?

Selection of voltage range

Selection of charging time

Selection of current rating

Selection of charging method

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Question 21 of 39

21. Which type of inverter circuit?

Two winding transformer inverter

Driven inverter

Single transistor inverter

SCR used inverter

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Question 22 of 39

22. In which method the battery is charged at low current for long period?

Trickle charging method

Constant potential method

Constant current method

Rectifier method

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Question 23 of 39

23. What happens to terminal voltage when load increases?

Decreases

Remains same

Falls to zero

Increases

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Question 24 of 39

24. What is the outcome of the chemical reaction in negative plate of lead acid battery during discharging?

Sponge lead(Pb)

Lead sulphate + water

Lead peroxide(PbO2)

Lead sulphate(PbSO4)

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Question 25 of 39

25. What is the effect of buckling defect in lead acid battery?

Reducing strength of electrolyte

Making short between electrodes

Bending of the electrodes

Increasing internal resistance

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Question 26 of 39

26. QUESTION: Which effect causes by passing electric current in liquids?

Lighting

Magnetic

Chemical

Heating

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Question 27 of 39

27. QUESTION: What is the name of defect that bending of plates in secondary cells?

Buckling

Hard sulphation

Partial short

Local action

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Question 28 of 39

28. What purpose the hydrometer is used during charging of battery?

Determine the AH capacity

Assess the discharge level of battery

Assess the battery voltage level

Determine the specific gravity of electrolyte

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Question 29 of 39

29. QUESTION: Which material is used to make negative plates in lead acid battery?

Lead peroxide

Sponge lead

Lead sulphate

Lead dioxide

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Question 30 of 39

30. Why the vent plug is kept open during charging of a battery?

To allow oxygen enter inside

To escape the gas freely

To check the level of electrolyte

To check the colour changes in the plates

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Question 31 of 39

31. What is the effect on output power with respect to temperature in solar cells?

Decreases with decrease in temperature

No effect on change in temperature

Increases with increase in temperature

Decreases with increase in temperature

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Question 32 of 39

32. QUESTION: What is the output voltage of lithium cell?

1.8 V

1.5 V

2.5 V

1.2 V

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Question 33 of 39

33. QUESTION: Which technique is used to control the corrosion of a metal surface?

Cathodic protection

Electrostatic protection

Anodic protection

Electrolytic protection

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Question 34 of 39

34. What is the Electro Chemical Equivalent (ECE) of silver?

0.1182 mg/coulomb

0.01182 mg/coulomb

1.1182 mg/coulomb

0.001182 mg/coulomb

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Question 35 of 39

35. Which is used as positive electrode in dry cell?

Lithium

Copper

Carbon

Zinc

Question 35 of 39

Question 36 of 39

36. QUESTION: What is the method of charging if the battery is to be charged for short duration at higher rate?

Initial charge

Boost charge

Freshening charge

Trickle charge

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Question 37 of 39

37. Which material is used as cathode (-ve) electrode in silver oxide battery?

Zinc

Copper

Silver oxide

Carbon

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Question 38 of 39

38. QUESTION: Which law secondary cell works?

Joule's law

Faradays laws of electrolysis

Faradays laws of electromagnetic induction

Lenz's law

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Question 39 of 39

39. Which instrument measures specific gravity of electrolyte in lead acid battery?

Anima meter

High rate discharge tester

Barometer

Hydrometer

Question 39 of 39