MODULE 3 CHAPTER 5 QUIZ 3

Question Number. 21. If a nicad battery is not to be used immediately it should be stored. Option A. dry. Option B. fully charged. Option C. fully dissipated. Correct Answer is. fully dissipated. Explanation. Ni-cad batteries must be stored fully discharged. Often with a metal bar across their terminals to ensure they are fully dissipated ..................................

Question Number. 22. In a mercury cell the steel casing is. Option A. the negative terminal. Option B. neither. Option C. the positive terminal. Correct Answer is. the positive terminal. Explanation. The 'outer can' is in contact with the zinc anode, which is positive ..................................

Question Number. 23. To improve the life of a dry cell it would be manufactured with. Option A. more electrolyte paste. Option B. more zinc. Option C. a pure carbon positive rod. Correct Answer is. more zinc. Explanation. The zinc (negative electrode or cathode) gets eaten away ..................................

Question Number. 24. In a simple voltaic cell the collection of ions on the cathode causes. Option A. polarisation. Option B. sulphation. Option C. hydration. ... Correct Answer is. sulphation. Explanation. The formation of lead sulphate on both plates of a lead acid battery is called SULPHATION ..................................

Question Number. 25. The electrolyte in a nicad battery would rise if the battery was. Option A. remaining at constant voltage. Option B. charging. Option C. discharging. Correct Answer is. charging. Explanation. The physical level of electrolyte drops a as Ni-Cad battery discharges ..................................

Question Number. 26. Two 2 volt 10AH cells are connected in series, the output voltage and the capacity would be. Option A. 4 volt 10 AH. Option B. 4 volt 20 AH. Option C. 2 volt, 20 AH. Correct Answer is. 4 volt 10 AH. Explanation. Batteries in series - voltage doubles, but the rating stays the same ..................................

Question Number. 27. The electrolyte in a nicad battery is. Option A. potassium hydroxide. Option B. nickel hydroxide. Option C. cadmium hydroxide. Correct Answer is. potassium hydroxide. Explanation. NIL ..................................

Question Number. 28. In a Leclanche cell the plates are made of. Option A. mercury and lithium. Option B. nickel and cadmium. Option C. zinc and carbon. Correct Answer is. zinc and carbon. Explanation. NIL ..................................

Question Number. 29. In a simple voltaic cell, polarization reduces output voltage because of the. Option A. build up of hydrogen on the cathode. Option B. transfer of material between the anode and the cathode. Option C. build up of hydrogen on the anode. Correct Answer is. build up of hydrogen on the anode. Explanation. NIL. ...

Question Number. 30. When the temperature of the electrolyte in a battery increases, the SG. Option A. remains the same. Option B. goes up. Option C. goes down. Correct Answer is. goes down. Explanation. Volume rises with temperature, but mass does not. SG is a measure of the electrolyte density (which is mass / volume) ..................................