Q.1
The average charging voltage for alkali cell is about
  • 1 V
  • 1.2 V
  • 1.7 V
  • 2.1 V
Q.2
Capacity of dry cells is
  • more when it is supplying current for intermittent periods
  • more when it is supplying current for continuous periods
  • unaffected by the type of discharge
  • none of the above
Q.3
Persons preparing electrolyte should wear
  • goggles or other face shield
  • rubber
  • rubber boots and gloves
  • all above safety devices
Q.4
Following will occur if level of electrolyte falls below plates
  • capacity of the cell is reduced
  • life of the cell is reduced
  • open plates are converted to lead sulphate
  • all above
Q.5
Which of the following factors adversely affects the capacity of the leadacid battery ?
  • Temperature of surroundings
  • Specific gravity of electrolyte
  • Rate of discharge
  • All of the above
Q.6
The watt-hour efficiency of a lead-acid cell varies between
  • 25 to 35%
  • 40 to 60%
  • 70 to 80%
  • 90 to 95%
Q.7
The capacity of a lead-acid cell is measured in
  • amperes
  • ampere-hours
  • watts
  • watt-hours
Q.8
The best indication about the state of charge on a lead-acid battery is given by
  • output voltage
  • temperature of electrolyte
  • specific gravity of electrolyte
  • none of the above
Q.9
Electrolyte used in a lead-acid cell is
  • NaOH
  • only H₂SO₄
  • only water
  • dilute H₂SO₄
Q.10
The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is
  • just one
  • always greater than one
  • always less than one
  • none of the above
Q.11
While preparing electrolyte for a lead-acid battery
  • water is poured into acid
  • acid is poured into water
  • anyone of the two can be added to other chemical
  • none of the above
Q.12
The ampere-hour efficiency of a leadacid cell is normally between
  • 20 to 30%
  • 40 to 50%
  • 60 to 70%
  • 90 to 95%
Q.13
Which of the following has lower sp. gravity V
  • Dilute H₂SO₄
  • Concentrated H₂SO₄
  • Water
  • Any of the above
Q.14
During the charging of a lead-acid cell
  • its voltage increases
  • it gives out energy
  • its cathode becomes dark chocolate brown in colour
  • specific gravity of H₂SO₄ decreases
Q.15
Chargmg of sulphated battery produces ____ heat.
  • no
  • very little
  • less
  • more
Q.16
The lead-acid cell should never be discharged beyond
  • 1.8 V
  • 1.9 V
  • 2 V
  • 2.1 V
Q.17
Life of the batteries is in the following ascending order.
  • Lead-acid cell, Edison cell, Nickel cadmium cell
  • Lead-acid cell, Nickel-cadmium cell, Edison cell
  • Edison cell, Nickel-cadmium cell, lead-acid cell
  • Nickel-cadmium cell, Edison cell, lead-acid cell
Q.18
During charging the specific gravity of the electrolyte of a lead-acid battery
  • increases
  • decreases
  • remains the same
  • becomes zero
Q.19
As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its
  • compactness
  • lower e.m.f.
  • small quantity of electrolyte used
  • higher internal resistance
Q.20
The active materials of a nickel-iron battery are
  • nickel hydroxide
  • powdered iron and its oxide
  • 21% solution of kOH
  • all of the above
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