ELECTRICIAN 1st YEAR MODULE – Cell and Batteries

Question 1 of 39

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

Hydrochloric acid

Diluted sulphuric acid

Ammonium chloride

Potassium hydroxide

Question 1 of 39

Question 2 of 39

2. QUESTION: Which law secondary cell works?

Lenz's law

Faradays laws of electromagnetic induction

Faradays laws of electrolysis

Joule's law

Question 2 of 39

Question 3 of 39

3. Which type of inverter circuit?

Driven inverter

SCR used inverter

Single transistor inverter

Two winding transformer inverter

Question 3 of 39

Question 4 of 39

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

Lighting

Magnetic

Heating

Chemical

Question 4 of 39

Question 5 of 39

5. 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)

Question 5 of 39

Question 6 of 39

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

M = Z/it

M = it/Z

M = Zt/i

M = Zit

Question 6 of 39

Question 7 of 39

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

Electrostatic protection

Anodic protection

Cathodic protection

Electrolytic protection

Question 7 of 39

Question 8 of 39

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

Ammonium chloride

Dilute sulphuric acid

Concentrated hydrochloric acid

Potassium hydroxide

Question 8 of 39

Question 9 of 39

9. 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 9 of 39

Question 10 of 39

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

1.2 V

1.5 V

2.5 V

1.8 V

Question 10 of 39

Question 11 of 39

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

Connecting cells in parallel

Using depolarizing agent

Amalgamating zinc plate

Connecting cells in series

Question 11 of 39

Question 12 of 39

12. Which part loses electrons during electrolysis?

Electrolyte

Separator

Anode

Cathode

Question 12 of 39

Question 13 of 39

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

Decreases with decrease in temperature

Decreases with increase in temperature

Increases with increase in temperature

No effect on change in temperature

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Question 14 of 39

14. What is the total voltage of the circuit?

6.0 Volt

7.5 Volt

9.0 Volt

1.5 Volt

Question 14 of 39

Question 15 of 39

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

0.1182 mg/coulomb

1.1182 mg/coulomb

0.01182 mg/coulomb

0.001182 mg/coulomb

Question 15 of 39

Question 16 of 39

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

Copper

Carbon

Lithium

Zinc

Question 16 of 39

Question 17 of 39

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

Freshening charge

Boost charge

Trickle charge

Initial charge

Question 17 of 39

Question 18 of 39

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

Photo voltaic cell

Liquid crystal diode

Light emitting diode

Light dependent resistor

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Question 19 of 39

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

Zinc

Silver oxide

Copper

Carbon

Question 19 of 39

Question 20 of 39

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

Will get short circuited

Become open circuit

Voltage become zero

No effect will function normally

Question 20 of 39

Question 21 of 39

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

Hard sulphation

Partial short

Buckling

Local action

Question 21 of 39

Question 22 of 39

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

Increasing internal resistance

Reducing strength of electrolyte

Bending of the electrodes

Making short between electrodes

Question 22 of 39

Question 23 of 39

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

High rate discharge tester

Hydrometer

Barometer

Anima meter

Question 23 of 39

Question 24 of 39

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

0.329 g/coulomb

1.1182 mg/coulomb

0.329 mg/coulomb

1.1182 g/coulomb

Question 24 of 39

Question 25 of 39

25. 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

Question 25 of 39

Question 26 of 39

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

Assess the battery voltage level

Determine the specific gravity of electrolyte

Determine the AH capacity

Assess the discharge level of battery

Question 26 of 39

Question 27 of 39

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

Silver oxide

Voltaic

Mercury

Lithium

Question 27 of 39

Question 28 of 39

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

Trickle charging method

Rectifier method

Constant current method

Constant potential method

Question 28 of 39

Question 29 of 39

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

Changing with new electrolyte

Recharging the battery for a longer period at low current

Replacing with new electrodes

Recharging the battery for short period at high current

Question 29 of 39

Question 30 of 39

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

Ampere hour

Volt

Watt

Volt Ampere

Question 30 of 39

Question 31 of 39

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

Sponge lead(Pb)

Lead sulphate(PbSO4)

Lead sulphate + water

Lead peroxide(PbO2)

Question 31 of 39

Question 32 of 39

32. What happens to terminal voltage when load increases?

Falls to zero

Decreases

Increases

Remains same

Question 32 of 39

Question 33 of 39

33. 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 33 of 39

Question 34 of 39

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

Selection of current rating

Selection of charging method

Selection of charging time

Selection of voltage range

Question 34 of 39

Question 35 of 39

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

Coulomb

Ampere

Volt

Watt

Question 35 of 39

Question 36 of 39

36. Which apparatus checks battery charging voltage condition?

Hydrometer

High rate discharge tester

Voltmeter

Multimeter

Question 36 of 39

Question 37 of 39

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

4.5 V

1.5 V

3.0 V

0 V

Question 37 of 39

Question 38 of 39

38. 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 38 of 39

Question 39 of 39

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

Lead sulphate

Lead peroxide

Sponge lead

Lead dioxide

Question 39 of 39