Question 1 of 39

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

Using depolarizing agent

Connecting cells in parallel

Amalgamating zinc plate

Connecting cells in series

Question 1 of 39

Question 2 of 39

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

4.5 V

0 V

1.5 V

3.0 V

Question 2 of 39

Question 3 of 39

3. Which type of inverter circuit?

Two winding transformer inverter

SCR used inverter

Driven inverter

Single transistor inverter

Question 3 of 39

Question 4 of 39

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

Watt

Volt

Coulomb

Ampere

Question 4 of 39

Question 5 of 39

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

0.329 g/coulomb

0.329 mg/coulomb

1.1182 g/coulomb

1.1182 mg/coulomb

Question 5 of 39

Question 6 of 39

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

Become open circuit

Voltage become zero

Will get short circuited

No effect will function normally

Question 6 of 39

Question 7 of 39

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

Trickle charging method

Constant potential method

Constant current method

Rectifier method

Question 7 of 39

Question 8 of 39

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

To keep positive and negative plate in sequence array

To avoid short between positive and negative plates

To provide a path for electrolyte

To hold the positive and negative plate firmly

Question 8 of 39

Question 9 of 39

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

0.1182 mg/coulomb

1.1182 mg/coulomb

0.001182 mg/coulomb

0.01182 mg/coulomb

Question 9 of 39

Question 10 of 39

10. 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

Question 10 of 39

Question 11 of 39

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

To escape the gas freely

To allow oxygen enter inside

To check the level of electrolyte

To check the colour changes in the plates

Question 11 of 39

Question 12 of 39

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

Concentrated hydrochloric acid

Ammonium chloride

Potassium hydroxide

Dilute sulphuric acid

Question 12 of 39

Question 13 of 39

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

Selection of charging time

Selection of charging method

Selection of current rating

Selection of voltage range

Question 13 of 39

Question 14 of 39

14. QUESTION: Which law secondary cell works?

Faradays laws of electrolysis

Lenz's law

Joule's law

Faradays laws of electromagnetic induction

Question 14 of 39

Question 15 of 39

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

Carbon

Copper

Zinc

Lithium

Question 15 of 39

Question 16 of 39

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

Sponge lead(Pb)

Lead sulphate(PbSO4)

Lead peroxide(PbO2)

Lead sulphate + water

Question 16 of 39

Question 17 of 39

17. What is the total voltage of the circuit?

6.0 Volt

9.0 Volt

7.5 Volt

1.5 Volt

Question 17 of 39

Question 18 of 39

18. What causes buckling defect in lead acid batteries?

Charging with low rate for short period

Overcharging or over discharging

Keeping battery discharged for long periods

Formation of sediments falling from plates

Question 18 of 39

Question 19 of 39

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

Potassium hydroxide

Ammonium chloride

Diluted sulphuric acid

Hydrochloric acid

Question 19 of 39

Question 20 of 39

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

Mass deposited in grams

E.C.E of electrolyte

Time in seconds

Current in Amperes

Question 20 of 39

Question 21 of 39

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

Magnetic

Lighting

Chemical

Heating

Question 21 of 39

Question 22 of 39

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

Lithium

Silver oxide

Mercury

Voltaic

Question 22 of 39

Question 23 of 39

23. Which apparatus checks battery charging voltage condition?

Hydrometer

High rate discharge tester

Multimeter

Voltmeter

Question 23 of 39

Question 24 of 39

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

Copper

Silver oxide

Carbon

Zinc

Question 24 of 39

Question 25 of 39

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

1.5 V

1.2 V

1.8 V

2.5 V

Question 25 of 39

Question 26 of 39

26. Which part loses electrons during electrolysis?

Separator

Electrolyte

Anode

Cathode

Question 26 of 39

Question 27 of 39

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

Trickle charge

Boost charge

Freshening charge

Initial charge

Question 27 of 39

Question 28 of 39

28. What happens to terminal voltage when load increases?

Increases

Decreases

Remains same

Falls to zero

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

Hard sulphation

Buckling

Partial short

Local action

Question 30 of 39

Question 31 of 39

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

Making short between electrodes

Bending of the electrodes

Reducing strength of electrolyte

Increasing internal resistance

Question 31 of 39

Question 32 of 39

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

Lead peroxide(PbO2)

Lead sulphate + water

Lead sulphate(PbSO4)

Sponge lead (Pb)

Question 32 of 39

Question 33 of 39

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

Watt

Volt Ampere

Volt

Ampere hour

Question 33 of 39

Question 34 of 39

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

Assess the battery voltage level

Determine the specific gravity of electrolyte

Assess the discharge level of battery

Determine the AH capacity

Question 34 of 39

Question 35 of 39

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

Electrostatic protection

Electrolytic protection

Cathodic protection

Anodic protection

Question 35 of 39

Question 36 of 39

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

Lead sulphate

Sponge lead

Lead peroxide

Lead dioxide

Question 36 of 39

Question 37 of 39

37. 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 37 of 39

Question 38 of 39

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

M = Zt/i

M = Zit

M = it/Z

M = Z/it

Question 38 of 39

Question 39 of 39

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

Barometer

Anima meter

Hydrometer

High rate discharge tester

Question 39 of 39