ELECTRICIAN 1st YEAR MODULE – Cell and Batteries

Question 1 of 39

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

Anodic protection

Electrolytic protection

Electrostatic protection

Cathodic protection

Question 1 of 39

Question 2 of 39

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

To avoid short between positive and negative plates

To hold the positive and negative plate firmly

To keep positive and negative plate in sequence array

To provide a path for electrolyte

Question 2 of 39

Question 3 of 39

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

High rate discharge tester

Barometer

Anima meter

Hydrometer

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 sulphate + water

Lead peroxide(PbO2)

Sponge lead (Pb)

Lead sulphate(PbSO4)

Question 4 of 39

Question 5 of 39

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

Lead sulphate + water

Sponge lead(Pb)

Lead sulphate(PbSO4)

Lead peroxide(PbO2)

Question 5 of 39

Question 6 of 39

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

Initial charge

Trickle charge

Freshening charge

Boost charge

Question 6 of 39

Question 7 of 39

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

Volt

Ampere hour

Volt Ampere

Watt

Question 7 of 39

Question 8 of 39

8. Which type of inverter circuit?

Two winding transformer inverter

Single transistor inverter

Driven inverter

SCR used inverter

Question 8 of 39

Question 9 of 39

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

Ampere

Watt

Coulomb

Volt

Question 9 of 39

Question 10 of 39

10. 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

Question 10 of 39

Question 11 of 39

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

Lead sulphate

Sponge lead

Lead dioxide

Lead peroxide

Question 11 of 39

Question 12 of 39

12. 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

Question 12 of 39

Question 13 of 39

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

2.5 V

1.8 V

1.2 V

1.5 V

Question 13 of 39

Question 14 of 39

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

No effect will function normally

Become open circuit

Voltage become zero

Will get short circuited

Question 14 of 39

Question 15 of 39

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

Determine the specific gravity of electrolyte

Assess the battery voltage level

Determine the AH capacity

Assess the discharge level of battery

Question 15 of 39

Question 16 of 39

16. 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

Question 16 of 39

Question 17 of 39

17. QUESTION: Which law secondary cell works?

Faradays laws of electromagnetic induction

Lenz's law

Joule's law

Faradays laws of electrolysis

Question 17 of 39

Question 18 of 39

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

Magnetic

Heating

Chemical

Lighting

Question 18 of 39

Question 19 of 39

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

To check the level of electrolyte

To escape the gas freely

To check the colour changes in the plates

To allow oxygen enter inside

Question 19 of 39

Question 20 of 39

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

Carbon

Copper

Zinc

Silver oxide

Question 20 of 39

Question 21 of 39

21. What happens to terminal voltage when load increases?

Falls to zero

Remains same

Increases

Decreases

Question 21 of 39

Question 22 of 39

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

0.001182 mg/coulomb

0.01182 mg/coulomb

1.1182 mg/coulomb

0.1182 mg/coulomb

Question 22 of 39

Question 23 of 39

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

Voltaic

Lithium

Silver oxide

Mercury

Question 23 of 39

Question 24 of 39

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

Partial short

Local action

Hard sulphation

Buckling

Question 24 of 39

Question 25 of 39

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

0 V

3.0 V

4.5 V

1.5 V

Question 25 of 39

Question 26 of 39

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

Recharging the battery for a longer period at low current

Recharging the battery for short period at high current

Replacing with new electrodes

Changing with new electrolyte

Question 26 of 39

Question 27 of 39

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

Ammonium chloride

Dilute sulphuric acid

Potassium hydroxide

Concentrated hydrochloric acid

Question 27 of 39

Question 28 of 39

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

Photo voltaic cell

Liquid crystal diode

Light dependent resistor

Light emitting diode

Question 28 of 39

Question 29 of 39

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

Reducing strength of electrolyte

Making short between electrodes

Bending of the electrodes

Increasing internal resistance

Question 29 of 39

Question 30 of 39

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

Potassium hydroxide

Ammonium chloride

Diluted sulphuric acid

Hydrochloric acid

Question 30 of 39

Question 31 of 39

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

M = it/Z

M = Z/it

M = Zt/i

M = Zit

Question 31 of 39

Question 32 of 39

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

Trickle charging method

Rectifier method

Constant potential method

Constant current method

Question 32 of 39

Question 33 of 39

33. Which part loses electrons during electrolysis?

Separator

Anode

Electrolyte

Cathode

Question 33 of 39

Question 34 of 39

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

Carbon

Copper

Lithium

Zinc

Question 34 of 39

Question 35 of 39

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

Using depolarizing agent

Connecting cells in series

Amalgamating zinc plate

Connecting cells in parallel

Question 35 of 39

Question 36 of 39

36. Which apparatus checks battery charging voltage condition?

Voltmeter

Hydrometer

High rate discharge tester

Multimeter

Question 36 of 39

Question 37 of 39

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

E.C.E of electrolyte

Mass deposited in grams

Current in Amperes

Time in seconds

Question 37 of 39

Question 38 of 39

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

Decreases with increase in temperature

No effect on change in temperature

Increases with increase in temperature

Decreases with decrease in temperature

Question 38 of 39

Question 39 of 39

39. What is the total voltage of the circuit?

1.5 Volt

6.0 Volt

7.5 Volt

9.0 Volt

Question 39 of 39