# Multiple Choice Question (MCQ) of Battery page-4

31. Proper charging rate for lead acid battery is

A) 1/2 of rated ampere hour capacity
B) 1/3 of rated ampere hour capacity
C) 1/4 of rated ampere hour capacity
D) 1/8 of rated ampere hour capacity.

Ans : (D)

32. When n cells each of emf E volts and internal resistance r ohms are connected in parallel, the strength of the current i is given by

A) nE/r+R
B) E/n+Rr
C) E/R+r/n
D) E/R+n/r .

Ans : (C)

33. When n cells, each of emf E volts and internal resistance r ohms are connected in series, the current i through an external resistance R ohms is given by

A)i = nE/R+nr
B)i = E/R+r/n
C)i = nE/r+nR
D)i = E/R+r.

Ans : (A)

34. The internal resistance of a dry cell is of the order of

A) 0.2 to 0.4 ohms
B) 1 to 1.5 ohms
C) 2 to 5 ohms
D) 1 to 15 ohms.

Ans : (A)

35. The e.m.f. of a storage battery depends upon

A) size of the electrodes
B) shape of the cell
C) nature of electrodes
D) all of the above.

Ans : (C)

36. Internal resistance of a battery is due to

A) resistance of electrolyte
B) resistance of electrodes
C) surface contact resistance
D) all of the above.

Ans : (D)

37. A wet battery cover in case of lead acid battery indicates

A) leaky seals at covers
B) overfilling of the battery
C) excessive gassing during charging
D) any of the above.

Ans : (D)

38. Trickle charge is required for

A) Lithium cells
B) nickel iron cells
D) all of the above.

Ans : (D)

39. What is the arrangement to get the maximum current in 3 Ω resistance in the case of 24 cells, each of internal resistance 2 ohms ?

A) 4 cells in series with six rows in parallel
B) 6 cells in series with four rows in parallel
C) 3 cells in series with three rows in parallel
D) 12 cells in series with two rows in parallel.

Ans : (B)

40. On watt hour basis the efficiency of a lead acid battery is in the range

A) 60 to 70 percent
B) 70 to 85 percent
C) 80 to 85 percent
D) 90 to 95 percent.

Ans : (B)