6. As compared to constant-current system, the constant-voltage system of charging a lead-acid cell has the advantage of :
(a) avoiding excessive gassing
(b) reducing time of charging
(c) increasing cell capacity
(d) both (b) and (c)
7. Sulphation in a lead-acid battery occurs due to :
(a) trickle charging
(b) incomplete charging
(c) heavy discharging
(d) fast charging
8. The active materials of a nickel-iron battery are :
(a) nickel hydroxide
(b) powdered iron and its oxides
(c) 21% solution of caustic potash
(d) all of the above
9. During the charging and discharging of a nickel iron cell :
(a) its e.m.f. remains constant
(b) water is neither formed nor absorbed
(c) corrosive fumes are produced
(d) nickel hydroxide remains unsplit
10. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its :
(a) lower e.m.f.
(b) smaller quantity of electrolyte used
(c) higher internal resistance
(d) compactness
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Power Sources » Exercise - 16. As compared to constant-current system, the constant-voltage system of charging a lead-acid cell has the advantage of : (a) avoiding excessive gassing (b) reducing time of charging (c) increasing cell capacity (d) both (b) and (c)- Power Sources » Exercise - 15. The capacity of a lead-acid cell does NOT depend on its : (a) rate of charge (b) rate of discharge (c) temperature (d) quantity of active material
- Power Sources » Exercise - 13. The ratio of Ah efficiency to Wh efficiency of a lead-acid cell is : (a) always less than one (b) just one (c) always greater than one (d) either (a) or (b)
- Power Sources » Exercise - 1 1. Active materials of a lead-acid cell are : (a) lead peroxide (b) sponge lead (c) dilute sulphuric acid (d) all the above
- Power Sources » Exercise - 12. During the charging of a lead-acid cell : (a) its cathode becomes dark chocolate brown in colour (b) its voltage increases (c) it gives out energy (d) specific gravity of H2SO4 is decreased