Question 1 of 39

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

Ampere

Watt

Coulomb

Volt

Question 1 of 39

Question 2 of 39

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

Lead peroxide(PbO2)

Lead sulphate + water

Sponge lead (Pb)

Lead sulphate(PbSO4)

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Question 3 of 39

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

Zinc

Carbon

Copper

Lithium

Question 3 of 39

Question 4 of 39

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

Increasing internal resistance

Making short between electrodes

Bending of the electrodes

Reducing strength of electrolyte

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Question 5 of 39

5. What causes buckling defect in lead acid batteries?

Keeping battery discharged for long periods

Formation of sediments falling from plates

Charging with low rate for short period

Overcharging or over discharging

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Question 6 of 39

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

0.01182 mg/coulomb

0.1182 mg/coulomb

1.1182 mg/coulomb

0.001182 mg/coulomb

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Question 7 of 39

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

Electrolytic protection

Cathodic protection

Electrostatic protection

Anodic protection

Question 7 of 39

Question 8 of 39

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

Liquid crystal diode

Light emitting diode

Photo voltaic cell

Light dependent resistor

Question 8 of 39

Question 9 of 39

9. 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 10 of 39

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

4.5 V

1.5 V

0 V

3.0 V

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Question 11 of 39

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

Assess the discharge level of battery

Assess the battery voltage level

Determine the AH capacity

Determine the specific gravity of electrolyte

Question 11 of 39

Question 12 of 39

12. 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

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Question 13 of 39

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

Become open circuit

Will get short circuited

Voltage become zero

No effect will function normally

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Question 14 of 39

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

Using depolarizing agent

Connecting cells in parallel

Amalgamating zinc plate

Connecting cells in series

Question 14 of 39

Question 15 of 39

15. QUESTION: Which law secondary cell works?

Faradays laws of electromagnetic induction

Lenz's law

Joule's law

Faradays laws of electrolysis

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Question 16 of 39

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

Hard sulphation

Local action

Buckling

Partial short

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Question 17 of 39

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

Anima meter

High rate discharge tester

Hydrometer

Barometer

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Question 18 of 39

18. What happens to terminal voltage when load increases?

Remains same

Falls to zero

Decreases

Increases

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Question 19 of 39

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

To check the level of electrolyte

To allow oxygen enter inside

To escape the gas freely

To check the colour changes in the plates

Question 19 of 39

Question 20 of 39

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

0.329 g/coulomb

1.1182 mg/coulomb

1.1182 g/coulomb

0.329 mg/coulomb

Question 20 of 39

Question 21 of 39

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

Time in seconds

Current in Amperes

E.C.E of electrolyte

Mass deposited in grams

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?

Trickle charge

Initial charge

Freshening charge

Boost charge

Question 22 of 39

Question 23 of 39

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

Rectifier method

Constant potential method

Constant current method

Trickle charging method

Question 23 of 39

Question 24 of 39

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

To provide a path for electrolyte

To hold the positive and negative plate firmly

To avoid short between positive and negative plates

To keep positive and negative plate in sequence array

Question 24 of 39

Question 25 of 39

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

Concentrated hydrochloric acid

Potassium hydroxide

Ammonium chloride

Dilute sulphuric acid

Question 25 of 39

Question 26 of 39

26. Which type of inverter circuit?

Driven inverter

SCR used inverter

Single transistor inverter

Two winding transformer inverter

Question 26 of 39

Question 27 of 39

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

1.2 V

1.5 V

1.8 V

2.5 V

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Question 28 of 39

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

M = Zt/i

M = it/Z

M = Z/it

M = Zit

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Question 29 of 39

29. Which part loses electrons during electrolysis?

Separator

Electrolyte

Anode

Cathode

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Question 30 of 39

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

Watt

Volt Ampere

Volt

Ampere hour

Question 30 of 39

Question 31 of 39

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

Selection of voltage range

Selection of current rating

Selection of charging time

Selection of charging method

Question 31 of 39

Question 32 of 39

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

Chemical

Lighting

Magnetic

Heating

Question 32 of 39

Question 33 of 39

33. Which apparatus checks battery charging voltage condition?

High rate discharge tester

Hydrometer

Voltmeter

Multimeter

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Question 34 of 39

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

Carbon

Silver oxide

Zinc

Copper

Question 34 of 39

Question 35 of 39

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

Ammonium chloride

Diluted sulphuric acid

Potassium hydroxide

Hydrochloric acid

Question 35 of 39

Question 36 of 39

36. What is the total voltage of the circuit?

9.0 Volt

7.5 Volt

6.0 Volt

1.5 Volt

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Question 37 of 39

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

Sponge lead

Lead sulphate

Lead dioxide

Lead peroxide

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Question 38 of 39

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

Increases with increase in temperature

Decreases with increase in temperature

No effect on change in temperature

Decreases with decrease in temperature

Question 38 of 39

Question 39 of 39

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

Mercury

Silver oxide

Voltaic

Lithium

Question 39 of 39