ELECTRICIAN 1st YEAR MODULE – Cell and Batteries

Question 1 of 39

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

Selection of voltage range

Selection of charging method

Selection of current rating

Selection of charging time

Question 1 of 39

Question 2 of 39

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

Determine the specific gravity of electrolyte

Assess the battery voltage level

Assess the discharge level of battery

Determine the AH capacity

Question 2 of 39

Question 3 of 39

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

Lead sulphate

Sponge lead

Lead peroxide

Lead dioxide

Question 3 of 39

Question 4 of 39

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

Copper

Carbon

Zinc

Silver oxide

Question 4 of 39

Question 5 of 39

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

Ampere hour

Volt Ampere

Watt

Volt

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Question 6 of 39

6. 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

Question 6 of 39

Question 7 of 39

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

Recharging the battery for short period at high current

Changing with new electrolyte

Recharging the battery for a longer period at low current

Replacing with new electrodes

Question 7 of 39

Question 8 of 39

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

Lead sulphate + water

Lead sulphate(PbSO4)

Lead peroxide(PbO2)

Sponge lead (Pb)

Question 8 of 39

Question 9 of 39

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

Trickle charging method

Constant current method

Rectifier method

Constant potential method

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Question 10 of 39

10. Which type of inverter circuit?

Single transistor inverter

SCR used inverter

Driven inverter

Two winding transformer inverter

Question 10 of 39

Question 11 of 39

11. Which part loses electrons during electrolysis?

Electrolyte

Separator

Cathode

Anode

Question 11 of 39

Question 12 of 39

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

Ammonium chloride

Diluted sulphuric acid

Potassium hydroxide

Hydrochloric acid

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Question 13 of 39

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

1.5 V

3.0 V

0 V

4.5 V

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Question 14 of 39

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

High rate discharge tester

Barometer

Anima meter

Hydrometer

Question 14 of 39

Question 15 of 39

15. What causes buckling defect in lead acid batteries?

Overcharging or over discharging

Charging with low rate for short period

Formation of sediments falling from plates

Keeping battery discharged for long periods

Question 15 of 39

Question 16 of 39

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

Bending of the electrodes

Reducing strength of electrolyte

Making short between electrodes

Increasing internal resistance

Question 16 of 39

Question 17 of 39

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

Dilute sulphuric acid

Ammonium chloride

Potassium hydroxide

Concentrated hydrochloric acid

Question 17 of 39

Question 18 of 39

18. Which apparatus checks battery charging voltage condition?

Voltmeter

Multimeter

High rate discharge tester

Hydrometer

Question 18 of 39

Question 19 of 39

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

E.C.E of electrolyte

Current in Amperes

Time in seconds

Mass deposited in grams

Question 19 of 39

Question 20 of 39

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

Increases with increase in temperature

No effect on change in temperature

Decreases with increase in temperature

Decreases with decrease in temperature

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Question 21 of 39

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

Cathodic protection

Electrostatic protection

Anodic protection

Electrolytic protection

Question 21 of 39

Question 22 of 39

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

Initial charge

Freshening charge

Trickle charge

Boost charge

Question 22 of 39

Question 23 of 39

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

Lead sulphate(PbSO4)

Lead sulphate + water

Sponge lead(Pb)

Lead peroxide(PbO2)

Question 23 of 39

Question 24 of 39

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

1.1182 g/coulomb

0.329 mg/coulomb

1.1182 mg/coulomb

0.329 g/coulomb

Question 24 of 39

Question 25 of 39

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

To avoid short between positive and negative plates

To keep positive and negative plate in sequence array

To hold the positive and negative plate firmly

To provide a path for electrolyte

Question 25 of 39

Question 26 of 39

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

Coulomb

Ampere

Volt

Watt

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Question 27 of 39

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

Voltaic

Mercury

Lithium

Silver oxide

Question 27 of 39

Question 28 of 39

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

M = Z/it

M = Zt/i

M = it/Z

M = Zit

Question 28 of 39

Question 29 of 39

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

Chemical

Magnetic

Heating

Lighting

Question 29 of 39

Question 30 of 39

30. QUESTION: Which law secondary cell works?

Faradays laws of electrolysis

Lenz's law

Faradays laws of electromagnetic induction

Joule's law

Question 30 of 39

Question 31 of 39

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

Using depolarizing agent

Connecting cells in series

Connecting cells in parallel

Amalgamating zinc plate

Question 31 of 39

Question 32 of 39

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

To escape the gas freely

To allow oxygen enter inside

To check the colour changes in the plates

To check the level of electrolyte

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Question 33 of 39

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

Voltage become zero

Will get short circuited

Become open circuit

No effect will function normally

Question 33 of 39

Question 34 of 39

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

Zinc

Copper

Lithium

Carbon

Question 34 of 39

Question 35 of 39

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

Local action

Partial short

Hard sulphation

Buckling

Question 35 of 39

Question 36 of 39

36. What happens to terminal voltage when load increases?

Falls to zero

Decreases

Remains same

Increases

Question 36 of 39

Question 37 of 39

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

Photo voltaic cell

Light dependent resistor

Light emitting diode

Liquid crystal diode

Question 37 of 39

Question 38 of 39

38. What is the total voltage of the circuit?

1.5 Volt

9.0 Volt

7.5 Volt

6.0 Volt

Question 38 of 39

Question 39 of 39

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

2.5 V

1.2 V

1.8 V

1.5 V

Question 39 of 39