Question 1 of 39

1. 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 1 of 39

Question 2 of 39

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

Barometer

Anima meter

Hydrometer

High rate discharge tester

Question 2 of 39

Question 3 of 39

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

Buckling

Hard sulphation

Local action

Partial short

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Question 4 of 39

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

0.001182 mg/coulomb

0.1182 mg/coulomb

0.01182 mg/coulomb

1.1182 mg/coulomb

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Question 5 of 39

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

Ampere hour

Volt Ampere

Volt

Watt

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Question 6 of 39

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

Hydrochloric acid

Ammonium chloride

Potassium hydroxide

Diluted sulphuric acid

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Question 7 of 39

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

0.329 mg/coulomb

1.1182 g/coulomb

1.1182 mg/coulomb

0.329 g/coulomb

Question 7 of 39

Question 8 of 39

8. What happens to terminal voltage when load increases?

Increases

Falls to zero

Decreases

Remains same

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Question 9 of 39

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

Selection of current rating

Selection of charging time

Selection of voltage range

Selection of charging method

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Question 10 of 39

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

No effect on change in temperature

Decreases with decrease in temperature

Decreases with increase in temperature

Increases with increase in temperature

Question 10 of 39

Question 11 of 39

11. 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 11 of 39

Question 12 of 39

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

Heating

Chemical

Magnetic

Lighting

Question 12 of 39

Question 13 of 39

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

Potassium hydroxide

Concentrated hydrochloric acid

Dilute sulphuric acid

Ammonium chloride

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Question 14 of 39

14. Which type of inverter circuit?

SCR used inverter

Single transistor inverter

Driven inverter

Two winding transformer inverter

Question 14 of 39

Question 15 of 39

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

Silver oxide

Voltaic

Mercury

Lithium

Question 15 of 39

Question 16 of 39

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

Increasing internal resistance

Bending of the electrodes

Making short between electrodes

Reducing strength of electrolyte

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Question 17 of 39

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

Copper

Carbon

Zinc

Silver oxide

Question 17 of 39

Question 18 of 39

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

To keep positive and negative plate in sequence array

To avoid short between positive and negative plates

To hold the positive and negative plate firmly

To provide a path for electrolyte

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Question 19 of 39

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

Zinc

Copper

Lithium

Carbon

Question 19 of 39

Question 20 of 39

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

Assess the battery voltage level

Determine the specific gravity of electrolyte

Assess the discharge level of battery

Determine the AH capacity

Question 20 of 39

Question 21 of 39

21. Which part loses electrons during electrolysis?

Anode

Electrolyte

Separator

Cathode

Question 21 of 39

Question 22 of 39

22. What is the total voltage of the circuit?

7.5 Volt

6.0 Volt

9.0 Volt

1.5 Volt

Question 22 of 39

Question 23 of 39

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

Amalgamating zinc plate

Connecting cells in parallel

Connecting cells in series

Using depolarizing agent

Question 23 of 39

Question 24 of 39

24. Which apparatus checks battery charging voltage condition?

Hydrometer

Voltmeter

Multimeter

High rate discharge tester

Question 24 of 39

Question 25 of 39

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

Sponge lead

Lead dioxide

Lead peroxide

Lead sulphate

Question 25 of 39

Question 26 of 39

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

Lead sulphate(PbSO4)

Sponge lead(Pb)

Lead peroxide(PbO2)

Lead sulphate + water

Question 26 of 39

Question 27 of 39

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

Rectifier method

Trickle charging method

Constant potential method

Constant current method

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Question 28 of 39

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

3.0 V

4.5 V

0 V

1.5 V

Question 28 of 39

Question 29 of 39

29. 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 29 of 39

Question 30 of 39

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

M = Z/it

M = it/Z

M = Zt/i

M = Zit

Question 30 of 39

Question 31 of 39

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

2.5 V

1.2 V

1.5 V

1.8 V

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

Question 32 of 39

Question 33 of 39

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

Electrolytic protection

Anodic protection

Electrostatic protection

Cathodic protection

Question 33 of 39

Question 34 of 39

34. QUESTION: Which law secondary cell works?

Faradays laws of electromagnetic induction

Faradays laws of electrolysis

Joule's law

Lenz's law

Question 34 of 39

Question 35 of 39

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

Recharging the battery for a longer period at low current

Replacing with new electrodes

Changing with new electrolyte

Recharging the battery for short period at high current

Question 35 of 39

Question 36 of 39

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

Time in seconds

Current in Amperes

Mass deposited in grams

E.C.E of electrolyte

Question 36 of 39

Question 37 of 39

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

Watt

Ampere

Coulomb

Volt

Question 37 of 39

Question 38 of 39

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

Photo voltaic cell

Light dependent resistor

Light emitting diode

Liquid crystal diode

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Question 39 of 39

39. What causes buckling defect in lead acid batteries?

Formation of sediments falling from plates

Charging with low rate for short period

Overcharging or over discharging

Keeping battery discharged for long periods

Question 39 of 39