Question 1 of 39

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

Anima meter

High rate discharge tester

Hydrometer

Barometer

Question 1 of 39

Question 2 of 39

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

Hard sulphation

Partial short

Local action

Buckling

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

Lead peroxide(PbO2)

Lead sulphate(PbSO4)

Sponge lead (Pb)

Lead sulphate + water

Question 4 of 39

Question 5 of 39

5. 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

Recharging the battery for short period at high current

Changing with new electrolyte

Question 5 of 39

Question 6 of 39

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

To check the colour changes in the plates

To check the level of electrolyte

To allow oxygen enter inside

To escape the gas freely

Question 6 of 39

Question 7 of 39

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

M = Zit

M = Z/it

M = it/Z

M = Zt/i

Question 7 of 39

Question 8 of 39

8. Which part loses electrons during electrolysis?

Separator

Electrolyte

Anode

Cathode

Question 8 of 39

Question 9 of 39

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

Increasing internal resistance

Reducing strength of electrolyte

Making short between electrodes

Bending of the electrodes

Question 9 of 39

Question 10 of 39

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

Heating

Magnetic

Lighting

Chemical

Question 10 of 39

Question 11 of 39

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

Voltaic

Mercury

Silver oxide

Lithium

Question 11 of 39

Question 12 of 39

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

E.C.E of electrolyte

Time in seconds

Current in Amperes

Mass deposited in grams

Question 12 of 39

Question 13 of 39

13. What is the total voltage of the circuit?

7.5 Volt

9.0 Volt

1.5 Volt

6.0 Volt

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Question 14 of 39

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

Copper

Carbon

Zinc

Lithium

Question 14 of 39

Question 15 of 39

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

Dilute sulphuric acid

Concentrated hydrochloric acid

Ammonium chloride

Potassium hydroxide

Question 15 of 39

Question 16 of 39

16. What happens to terminal voltage when load increases?

Decreases

Increases

Remains same

Falls to zero

Question 16 of 39

Question 17 of 39

17. Which apparatus checks battery charging voltage condition?

Voltmeter

High rate discharge tester

Hydrometer

Multimeter

Question 17 of 39

Question 18 of 39

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

Copper

Carbon

Zinc

Silver oxide

Question 18 of 39

Question 19 of 39

19. Which type of inverter circuit?

Two winding transformer inverter

SCR used inverter

Single transistor inverter

Driven inverter

Question 19 of 39

Question 20 of 39

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

Electrostatic protection

Anodic protection

Electrolytic protection

Cathodic protection

Question 20 of 39

Question 21 of 39

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

Watt

Volt Ampere

Ampere hour

Volt

Question 21 of 39

Question 22 of 39

22. QUESTION: Which law secondary cell works?

Faradays laws of electrolysis

Joule's law

Faradays laws of electromagnetic induction

Lenz's law

Question 22 of 39

Question 23 of 39

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

To provide a path for electrolyte

To keep positive and negative plate in sequence array

To hold the positive and negative plate firmly

To avoid short between positive and negative plates

Question 23 of 39

Question 24 of 39

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

Coulomb

Watt

Volt

Ampere

Question 24 of 39

Question 25 of 39

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

Lead peroxide(PbO2)

Sponge lead(Pb)

Lead sulphate(PbSO4)

Lead sulphate + water

Question 25 of 39

Question 26 of 39

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

Potassium hydroxide

Diluted sulphuric acid

Hydrochloric acid

Ammonium chloride

Question 26 of 39

Question 27 of 39

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

2.5 V

1.2 V

1.5 V

1.8 V

Question 27 of 39

Question 28 of 39

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

Rectifier method

Constant potential method

Trickle charging method

Constant current method

Question 28 of 39

Question 29 of 39

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

Liquid crystal diode

Light dependent resistor

Photo voltaic cell

Light emitting diode

Question 29 of 39

Question 30 of 39

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

1.1182 g/coulomb

0.329 g/coulomb

0.329 mg/coulomb

1.1182 mg/coulomb

Question 30 of 39

Question 31 of 39

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

0.001182 mg/coulomb

1.1182 mg/coulomb

0.01182 mg/coulomb

0.1182 mg/coulomb

Question 31 of 39

Question 32 of 39

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

Using depolarizing agent

Connecting cells in series

Amalgamating zinc plate

Connecting cells in parallel

Question 34 of 39

Question 35 of 39

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

Trickle charge

Boost charge

Initial charge

Freshening charge

Question 35 of 39

Question 36 of 39

36. 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

Question 36 of 39

Question 37 of 39

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

Decreases with decrease in temperature

Increases with increase in temperature

No effect on change in temperature

Decreases with increase in temperature

Question 37 of 39

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

Will get short circuited

No effect will function normally

Question 38 of 39

Question 39 of 39

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

Selection of charging time

Selection of voltage range

Selection of charging method

Selection of current rating

Question 39 of 39