Question 1 of 39

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

Light dependent resistor

Light emitting diode

Liquid crystal diode

Photo voltaic cell

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Question 2 of 39

2. Which type of inverter circuit?

Driven inverter

Single transistor inverter

SCR used inverter

Two winding transformer inverter

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Question 3 of 39

3. 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 4 of 39

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

To hold the positive and negative plate firmly

To keep positive and negative plate in sequence array

To avoid short between positive and negative plates

To provide a path for electrolyte

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Question 5 of 39

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

Ampere

Volt

Coulomb

Watt

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Question 6 of 39

6. Which apparatus checks battery charging voltage condition?

Hydrometer

Multimeter

Voltmeter

High rate discharge tester

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Question 7 of 39

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

Voltaic

Silver oxide

Lithium

Mercury

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Question 8 of 39

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

Recharging the battery for short period at high current

Replacing with new electrodes

Changing with new electrolyte

Recharging the battery for a longer period at low current

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Question 9 of 39

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

1.2 V

1.8 V

1.5 V

2.5 V

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Question 10 of 39

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

Heating

Magnetic

Chemical

Lighting

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Question 11 of 39

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

Lead sulphate(PbSO4)

Lead sulphate + water

Lead peroxide(PbO2)

Sponge lead(Pb)

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Question 12 of 39

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

M = it/Z

M = Zt/i

M = Zit

M = Z/it

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Question 13 of 39

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

High rate discharge tester

Anima meter

Barometer

Hydrometer

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Question 14 of 39

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

0.01182 mg/coulomb

0.001182 mg/coulomb

1.1182 mg/coulomb

0.1182 mg/coulomb

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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)

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Question 16 of 39

16. Which part loses electrons during electrolysis?

Separator

Cathode

Electrolyte

Anode

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Question 17 of 39

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

Volt

Watt

Ampere hour

Volt Ampere

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Question 18 of 39

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

Selection of current rating

Selection of voltage range

Selection of charging method

Selection of charging time

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Question 19 of 39

19. 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 20 of 39

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

Determine the AH capacity

Assess the battery voltage level

Assess the discharge level of battery

Determine the specific gravity of electrolyte

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Question 21 of 39

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

To escape the gas freely

To check the level of electrolyte

To check the colour changes in the plates

To allow oxygen enter inside

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Question 22 of 39

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

1.1182 g/coulomb

1.1182 mg/coulomb

0.329 g/coulomb

0.329 mg/coulomb

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Question 23 of 39

23. What happens to terminal voltage when load increases?

Remains same

Increases

Falls to zero

Decreases

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Question 24 of 39

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

Mass deposited in grams

Current in Amperes

E.C.E of electrolyte

Time in seconds

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Question 25 of 39

25. 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

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Question 26 of 39

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

Hard sulphation

Buckling

Local action

Partial short

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Question 27 of 39

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

Lead peroxide

Sponge lead

Lead dioxide

Lead sulphate

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Question 28 of 39

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

Lithium

Carbon

Zinc

Copper

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Question 29 of 39

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

Making short between electrodes

Increasing internal resistance

Bending of the electrodes

Reducing strength of electrolyte

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Question 30 of 39

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

Increases with increase in temperature

Decreases with increase in temperature

Decreases with decrease in temperature

No effect on change in temperature

Question 30 of 39

Question 31 of 39

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

Dilute sulphuric acid

Concentrated hydrochloric acid

Potassium hydroxide

Ammonium chloride

Question 31 of 39

Question 32 of 39

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

Anodic protection

Electrostatic protection

Electrolytic protection

Cathodic protection

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Question 33 of 39

33. What is the total voltage of the circuit?

1.5 Volt

7.5 Volt

9.0 Volt

6.0 Volt

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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

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Question 35 of 39

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

Connecting cells in series

Amalgamating zinc plate

Using depolarizing agent

Connecting cells in parallel

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Question 36 of 39

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

Zinc

Copper

Silver oxide

Carbon

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Question 37 of 39

37. 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 38 of 39

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

Voltage become zero

Become open circuit

No effect will function normally

Will get short circuited

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Question 39 of 39

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

Ammonium chloride

Diluted sulphuric acid

Hydrochloric acid

Potassium hydroxide

Question 39 of 39