Power Sources – 1 – 2

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)

ANSWER

EXPLANATION

7. Sulphation in a lead-acid battery occurs due to :

(a) trickle charging
(b) incomplete charging
(c) heavy discharging
(d) fast charging

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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