Basic Electrical Engineering (3110005) MCQs

MCQs of Electrical Installations

Showing 61 to 70 out of 83 Questions
4 5 6 7 8 9
61.
The capacity of a lead-acid cell depends on
(a) rate of discharge
(b) temperature
(c) density of electrolyte
(d) all above
Answer:

Option (d)

62.
When the lead-acid cell is fully charged, the electrolyte assumes ______________ appearance
(a) dull
(b) reddish
(c) bright
(d) milky
Answer:

Option (d)

63.
The ampere-hour efficiency of a leadacid cell is normally between
(a) 20 to 30%
(b) 40 to 50%
(c) 60 to 70%
(d) 90 to 95%
Answer:

Option (d)

64.
The watt-hour efficiency of a lead-acid cell varies between
(a) 25 to 35%
(b) 40 to 60%
(c) 70 to 80%
(d) 90 to 95%
Answer:

Option (c)

65.
Cells are connected in series in order to
(a) increase the voltage rating
(b) increase the current rating
(c) increase the life of the cells
(d) none of the above
Answer:

Option (a)

66.
The output voltage of a charger should be
(a) less than the battery voltage
(b) higher than the battery voltage
(c) the same as the battery voltage
(d) none of the above
Answer:

Option (b)

67.
The storage battery generally used in electric power station is
(a) nickel-cadmium battery
(b) zinc-carbon battery
(c) lead-acid battery
(d) none of the above
Answer:

Option (c)

68.
The best indication about the state of charge on a lead-acid battery is given by
(a) output voltage
(b) temperature of electrolyte
(c) specific gravity of electrolyte
(d) none of the above
Answer:

Option (c)

69.
When a lead-acid battery is in fully charged condition, the colour of its positive plate is
(a) dark grey
(b) brown
(c) dark brown
(d) none of the above
Answer:

Option (c)

70.
During charging the specific gravity of the electrolyte of a lead-acid battery
(a) increases
(b) decreases
(c) remains the same
(d) becomes zero
Answer:

Option (a)

Showing 61 to 70 out of 83 Questions
4 5 6 7 8 9