Question 1 of 39

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

Assess the discharge level of battery

Assess the battery voltage level

Determine the specific gravity of electrolyte

Determine the AH capacity

Question 1 of 39

Question 2 of 39

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

High rate discharge tester

Hydrometer

Barometer

Anima meter

Question 2 of 39

Question 3 of 39

3. Which part loses electrons during electrolysis?

Electrolyte

Separator

Cathode

Anode

Question 3 of 39

Question 4 of 39

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

Initial charge

Trickle charge

Boost charge

Freshening charge

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Question 5 of 39

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

Ammonium chloride

Concentrated hydrochloric acid

Dilute sulphuric acid

Potassium hydroxide

Question 5 of 39

Question 6 of 39

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

1.1182 g/coulomb

0.329 mg/coulomb

0.329 g/coulomb

1.1182 mg/coulomb

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Question 7 of 39

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

Rectifier method

Constant current method

Constant potential method

Trickle charging method

Question 7 of 39

Question 8 of 39

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

Become open circuit

Voltage become zero

No effect will function normally

Will get short circuited

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Question 9 of 39

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

Lithium

Silver oxide

Mercury

Voltaic

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Question 10 of 39

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

Lighting

Chemical

Heating

Magnetic

Question 10 of 39

Question 11 of 39

11. QUESTION: Which law secondary cell works?

Faradays laws of electromagnetic induction

Faradays laws of electrolysis

Joule's law

Lenz's law

Question 11 of 39

Question 12 of 39

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

To keep positive and negative plate in sequence array

To provide a path for electrolyte

To hold the positive and negative plate firmly

To avoid short between positive and negative plates

Question 12 of 39

Question 13 of 39

13. Which apparatus checks battery charging voltage condition?

Multimeter

High rate discharge tester

Hydrometer

Voltmeter

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Question 14 of 39

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

Decreases with decrease in temperature

Decreases with increase in temperature

No effect on change in temperature

Increases with increase in temperature

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Question 15 of 39

15. 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 15 of 39

Question 16 of 39

16. What happens to terminal voltage when load increases?

Decreases

Increases

Falls to zero

Remains same

Question 16 of 39

Question 17 of 39

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

Amalgamating zinc plate

Connecting cells in parallel

Connecting cells in series

Using depolarizing agent

Question 17 of 39

Question 18 of 39

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

Coulomb

Volt

Watt

Ampere

Question 18 of 39

Question 19 of 39

19. 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

Question 19 of 39

Question 20 of 39

20. 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 colour changes in the plates

To check the level of electrolyte

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Question 21 of 39

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

Hard sulphation

Local action

Partial short

Buckling

Question 21 of 39

Question 22 of 39

22. What is the total voltage of the circuit?

1.5 Volt

7.5 Volt

9.0 Volt

6.0 Volt

Question 22 of 39

Question 23 of 39

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

Copper

Carbon

Zinc

Lithium

Question 23 of 39

Question 24 of 39

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

Lead sulphate

Lead dioxide

Sponge lead

Lead peroxide

Question 24 of 39

Question 25 of 39

25. What causes buckling defect in lead acid batteries?

Charging with low rate for short period

Formation of sediments falling from plates

Keeping battery discharged for long periods

Overcharging or over discharging

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Question 26 of 39

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

1.8 V

2.5 V

1.5 V

1.2 V

Question 26 of 39

Question 27 of 39

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

Selection of current rating

Selection of charging method

Selection of voltage range

Selection of charging time

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Question 28 of 39

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

Copper

Silver oxide

Zinc

Carbon

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Question 29 of 39

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

Photo voltaic cell

Light emitting diode

Liquid crystal diode

Light dependent resistor

Question 29 of 39

Question 30 of 39

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

Ampere hour

Volt Ampere

Watt

Volt

Question 30 of 39

Question 31 of 39

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

M = Zit

M = Zt/i

M = it/Z

M = Z/it

Question 31 of 39

Question 32 of 39

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

Diluted sulphuric acid

Hydrochloric acid

Potassium hydroxide

Ammonium chloride

Question 32 of 39

Question 33 of 39

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

0 V

3.0 V

4.5 V

1.5 V

Question 33 of 39

Question 34 of 39

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

0.1182 mg/coulomb

0.001182 mg/coulomb

0.01182 mg/coulomb

1.1182 mg/coulomb

Question 34 of 39

Question 35 of 39

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

Electrolytic protection

Cathodic protection

Anodic protection

Electrostatic protection

Question 35 of 39

Question 36 of 39

36. Which type of inverter circuit?

SCR used inverter

Two winding transformer inverter

Driven inverter

Single transistor inverter

Question 36 of 39

Question 37 of 39

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

Recharging the battery for a longer period at low current

Changing with new electrolyte

Replacing with new electrodes

Recharging the battery for short period at high current

Question 37 of 39

Question 38 of 39

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

Current in Amperes

Mass deposited in grams

E.C.E of electrolyte

Time in seconds

Question 38 of 39

Question 39 of 39

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

Lead sulphate + water

Lead peroxide(PbO2)

Sponge lead(Pb)

Lead sulphate(PbSO4)

Question 39 of 39