EE (Electrolysis and Storage Batteries)
The lead acid accumulator should be recharged when the specific gravity of the electrolyte is about
1.15
The average dry cell gives an approximate voltage of
1.5 V
To obtain a high voltage of about 1.9 V from a dry cell, one would use
Magnesium cell
Which of the following affects the capacity of a lead-acid battery? (temp, discharge time, specific gravity, all of these)
all of these
Local action in the primary cell can be rectified by
amalgamating the zinc electrode with mercury
In electroplating, the positive electrode is called the
anode
To keep the terminals of a lead acid storage battery free from corrosion, it is advisable to
apply petroleum jelly
A partially discharged lead storage battery may be brought back to full charge by
applying dc voltage across the terminals
One advantage of a secondary cell is that it
can be recharged
Gassing occurs in the process of
charging an accumulator
A fuel cell converts _______ energy into electrical energy.
chemical
The action of a dry cell is to change
chemical action to electrical energy
Polarization in dry cell can be got rid of by
chemical means
Cells are connected in parallel to
increase the current capacity
Cells are connected in series to
increase the voltage output
The function of the depolarizer in carbon zinc cell is that
it converts the produced hydrogen into water
Nickel-cadmium dry cell is becoming popular in power supplies to electronic calculators because
it is rechargeable
The advantage of the iron-nickel battery over the lead-acid battery is that
it needs less maintenance
While charging accumulators, one should
keep them in a well-ventilated space
The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity which passes through the electrolyte. The above statement is associated with
laws of electrolysis
The composition of a secondary cell is
lead, lead peroxide and dilute sulphuric acid
Impurities in an electrolyte can cause an internal short circuit condition called
local action
The two main defects of the primary cell are
local action and polarization
Which of the following acts as depolarizer in dry cell? (manganese dioxide, zinc chloride, ammonium chloride, carbon powder)
manganese dioxide
Electrochemical equivalent is
mass of the element liberated per unit quantity of hydrogen
Which of the following is a primary cell (mercury oxide, lead-acid, nickel-iron-alkaline, nickel-cadmium-alkaline)
mercury oxide
A cell which is used as voltage reference source for instrument calibration is
mercury-cadmium cell
Other types of accumulators besides the lead acid type are
nickel-cadmium batteries
It is not desirable to leave a lead storage battery in a discharged state for a long time mainly because
plates will become sulphated
Distilled or approved water is used in electrolytes because it
prevents or slows down local action
The mass of material deposited over an electrode is
proportional to quantity of electricity and electrochemical equivalent
The internal resistance of a discharged battery compared with a charged one
remains the same
Secondary cell can produce large amounts of power for a
short time and can be recharged
Separators in storage battery cell are designed to prevent the plates from
shorting together
The condition of a liquid electrolyte is measured in terms of its
specific gravity
Charging a lead-acid cell causes the electrolyte to become
stronger
Electrolyte of a storage battery is formed by adding
sulphuric acid to water
The ampere hour capacity of battery depends on
the area of the plates
The condition of a secondary cell can be determined by
the terminal voltage and strength of the electrolyte
When the electrolyte of a storage battery is low it is usually proper to
top up with distilled water
One factor affecting voltages of the primary cell is the
types of plates and electrolyte
During the charging period of a lead-acid battery, the charging rate is lowered to prevent violent gassing because
violent gassing tends to wash the active material from the plates
