Which of the following factors adversely affects the capacity of the leadacid battery ?

Specific gravity of electrolyte

Capacity of dry cells is

more when it is supplying current for continuous periods

more when it is supplying current for intermittent periods

more when it is supplying current for continuous periods

unaffected by the type of discharge

During the charging of a lead-acid cell

its cathode becomes dark chocolate brown in colour

specific gravity of H₂SO₄ decreases

Internal resistance of a cell is due to

surface contact resistance between electrode and electrolyte

Battery charging equipment is generally installed

As near as practical to the battery being charged

In location having all above features

It is noticed that during discharging the following does not happen

both anode and cathode become PbS04

specific gravity of H?SO? decreases

Increases specific gravity of the electrolyte

Reduces specific gravity of the electrolyte

Increases specific gravity of the electrolyte

Local action in a battery is indicated by

excessive gassing under load conditions

excessive drop in the specific gravity of electrolyte even when the cell is on open circuit

In a battery cover is placed over the element and sealed to the top of the battery container. This is done

to discharge none of the above functions

to reduce evaporation of water from electrolyte

to exclude dirt and foreign matter from the electrolyte

to discharge both of the above functions

to discharge none of the above functions

The output voltage of a charger is

the same as the battery voltage

higher than the battery voltage

the same as the battery voltage

A dead storage battery can be revived by

adding so-called battery restorer

Internal short circuits are caused by

breakdown of one or more separators

excess accumulation of sediment at the bottom of the cell

In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following

one part H2O, three parts H₂SO₄

two parts H2O, two parts H₂SO₄

three parts H2O, one part H₂SO₄

“The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”.The above statement is associated with

Faraday’s law of electromagnetic

Faraday’s law of electrolysis

increases the temperature resulting in buckling of plates

When two batteries are connected in parallel, it should be ensured that

they have same ampere-hour capacity

they have identical internal resistance

Each cell has a vent cap

to allow gases out when the cell is on charge

to add water to the cell if needed

to check the level of electrolyte

If a battery is wrongly connected on charge following will happen

current delivered by the battery will be high

current drawing will be very small

current drawing will be very high

When the load resistance equals the generator resistance which of the following will be maximum ?

Voltage across the load resistance

198 + Mcqs in Electrolysis And Storage Of Batteries in Electrical Engineering Page 1 McqOptions

1.	The active materials on the positive and negative plates of a fully charged lead-acid battery are
A.	lead and lead peroxide
B.	lead sulphate and lead
C.	lead peroxide and lead
D.	none of the above
Answer» D. none of the above

Discussion

2.	The current flow through electrolyte is due to the movement of
A.	ions
B.	holes
C.	electrons
D.	none of the above
Answer» B. holes

Discussion

3.	Which of the following factors adversely affects the capacity of the leadacid battery ?
A.	Temperature of surroundings
B.	Specific gravity of electrolyte
C.	Rate of discharge
D.	All of the above
Answer» E.

Discussion

4.	48 ampere-hour capacity would deliver a current of
A.	48 amperes for 1 hour
B.	24 amperes for 2 hours
C.	8 amperes for 6 hours
D.	6 amperes for 8 hours
Answer» E.

Discussion

5.	Persons preparing electrolyte should wear
A.	goggles or other face shield
B.	rubber
C.	rubber boots and gloves
D.	all above safety devices
Answer» E.

Discussion

6.	Capacity of dry cells is
A.	more when it is supplying current for intermittent periods
B.	more when it is supplying current for continuous periods
C.	unaffected by the type of discharge
D.	none of the above
Answer» B. more when it is supplying current for continuous periods

Discussion

7.	Which among the following constitutes the major load for an automobile battery ?
A.	Brake light
B.	Self starter
C.	Parking lights
D.	Spark plugs
Answer» C. Parking lights

Discussion

8.	The following indicate that battery on charge has attained full charge
A.	colour of electrode
B.	gassing
C.	specific gravity
D.	all above
Answer» E.

Discussion

9.	Lead-acid cell has a life of nearly charges and discharges
A.	500
B.	700
C.	1000
D.	1250
Answer» E.

Discussion

10.	Chargmg of sulphated battery produces ____ heat.
A.	no
B.	very little
C.	less
D.	more
Answer» E.

Discussion

11.	During the charging of a lead-acid cell
A.	its voltage increases
B.	it gives out energy
C.	its cathode becomes dark chocolate brown in colour
D.	specific gravity of H₂SO₄ decreases
Answer» B. it gives out energy

Discussion

12.	Internal resistance of a cell is due to
A.	resistance of electrolyte
B.	electrode resistance
C.	surface contact resistance between electrode and electrolyte
D.	all above
Answer» E.

Discussion

13.	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» E.

Discussion

14.	The effect of sulphation is that the internal resistance
A.	increases
B.	decreases
C.	remains same
D.	none of the above
Answer» B. decreases

Discussion

15.	Battery charging equipment is generally installed
A.	In well ventilated location
B.	In clean and dry place
C.	As near as practical to the battery being charged
D.	In location having all above features
Answer» E.

Discussion

16.	The e.m.f. of an Edison cell, when fully charged, is nearly
A.	1.4 V
B.	1 V
C.	0.9 V
D.	0.8 V
Answer» B. 1 V

Discussion

17.	The capacity of a battery is expressed in terms of
A.	current rating
B.	voltage rating
C.	ampere-hour rating
D.	none of the above
Answer» D. none of the above

Discussion

18.	It is noticed that during discharging the following does not happen
A.	both anode and cathode become PbS04
B.	specific gravity of H?SO? decreases
C.	voltage of the cell decreases
D.	the cell absorbs energy
Answer» E.

Discussion

19.	Hydrogen evolved during charging produces explosive mixture when it is more than
A.	2%
B.	4%
C.	6%
D.	8%
Answer» E.

Discussion

20.	Undercharging
A.	Reduces specific gravity of the electrolyte
B.	Increases specific gravity of the electrolyte
C.	Produces excessive gassing
D.	Increases the temperature
Answer» B. Increases specific gravity of the electrolyte

Discussion

21.	When a lead-acid battery is in fully charged condition, the color of its positive plate is
A.	dark grey
B.	brown
C.	dark brown
D.	none of above
Answer» D. none of above

Discussion

22.	In a lead-acid battery the energy is stored in the form of
A.	charged ions
B.	chemical energy
C.	electrostatic energy
D.	electromagnetic energy
Answer» C. electrostatic energy

Discussion

23.	Which of the following primary cells has the lowest voltage ?
A.	Lithium
B.	Zinc-chloride
C.	Mercury
D.	Carbon-zinc
Answer» D. Carbon-zinc

Discussion

24.	Local action in a battery is indicated by
A.	excessive gassing under load conditions
B.	excessive drop in the specific gravity of electrolyte even when the cell is on open circuit
C.	both (A) and (B)
D.	none of the above
Answer» E.

Discussion

25.	Specific gravity of electrolyte in Edison cell is
A.	0.8
B.	0.95
C.	1.1
D.	1.21
Answer» E.

Discussion

26.	In a battery cover is placed over the element and sealed to the top of the battery container. This is done
A.	to reduce evaporation of water from electrolyte
B.	to exclude dirt and foreign matter from the electrolyte
C.	to discharge both of the above functions
D.	to discharge none of the above functions
Answer» D. to discharge none of the above functions

Discussion

27.	The output voltage of a charger is
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» C. the same as the battery voltage

Discussion

28.	A dead storage battery can be revived by
A.	adding distilled water
B.	adding so-called battery restorer
C.	a dose of H₂SO₄
D.	none of the above
Answer» E.

Discussion

29.	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» D. none of the above

Discussion

30.	Internal short circuits are caused by
A.	breakdown of one or more separators
B.	excess accumulation of sediment at the bottom of the cell
C.	both (A) and (B)
D.	none of the above
Answer» D. none of the above

Discussion

31.	In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following
A.	one part H2O, three parts H₂SO₄
B.	two parts H2O, two parts H₂SO₄
C.	three parts H2O, one part H₂SO₄
D.	all H₂SO₄
Answer» D. all H₂SO₄

Discussion

32.	“The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”.The above statement is associated with
A.	Newton’s law
B.	Faraday’s law of electromagnetic
C.	Faraday’s law of electrolysis
D.	Gauss’s law
Answer» D. Gauss’s law

Discussion

33.	Over charging
A.	produces excessive gassing
B.	loosens the active material
C.	increases the temperature resulting in buckling of plates
D.	all above
Answer» E.

Discussion

34.	Ampere hour capacity of an industrial battery is based on ____ hours discharge rate.
A.	8
B.	12
C.	16
D.	24
Answer» B. 12

Discussion

35.	When two batteries are connected in parallel, it should be ensured that
A.	they have same e.m.f.
B.	they have same make
C.	they have same ampere-hour capacity
D.	they have identical internal resistance
Answer» B. they have same make

Discussion

36.	Battery container should be acid resistance, therefore it is made up of
A.	glass
B.	plastic
C.	wood
D.	all above
Answer» E.

Discussion

37.	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» D. 90 to 95%

Discussion

38.	The capacity of a lead-acid cell is measured in
A.	amperes
B.	ampere-hours
C.	watts
D.	watt-hours
Answer» C. watts

Discussion

39.	Each cell has a vent cap
A.	to allow gases out when the cell is on charge
B.	to add water to the cell if needed
C.	to check the level of electrolyte
D.	to do all above functions
Answer» E.

Discussion

40.	The specific gravity of electrolyte is measured by
A.	manometer
B.	a mechanical gauge
C.	hydrometer
D.	psychrometer
Answer» D. psychrometer

Discussion

41.	A constant-voltage generator has
A.	minimum efficiency
B.	minimum current capacity
C.	low internal resistance
D.	high internal resistance
Answer» D. high internal resistance

Discussion

42.	If a battery is wrongly connected on charge following will happen
A.	current delivered by the battery will be high
B.	current drawing will be nil
C.	current drawing will be very small
D.	current drawing will be very high
Answer» E.

Discussion

43.	When the load resistance equals the generator resistance which of the following will be maximum ?
A.	Current
B.	Efficiency of the circuit
C.	Power in the load resistance
D.	Voltage across the load resistance
Answer» D. Voltage across the load resistance

Discussion

44.	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» B. increase the current rating

Discussion

45.	Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as______materials.
A.	passive
B.	active
C.	redundant
D.	inert
Answer» C. redundant

Discussion

46.	The charge required to liberate one gram equivalent of any substance is known as ______ constant
A.	Time
B.	Faraday’s
C.	Boltzman
D.	none of the above
Answer» C. Boltzman

Discussion

47.	In ______ system the charging current is intermittently controlled at either a maximum or minimum value
A.	two rate charge control
B.	trickle charge
C.	floating charge
D.	an equalizing charge
Answer» B. trickle charge

Discussion

48.	A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.
A.	1.0
B.	1.5
C.	2.4
D.	2.9
Answer» D. 2.9

Discussion

49.	In constant-current charging method, the supply voltage from discharged to fully charged condition
A.	decreases
B.	increases
C.	remains constant
D.	none of the above
Answer» C. remains constant

Discussion

50.	In constant voltage charging method, the charging current from discharged to fully charged condition
A.	decreases
B.	increases
C.	remains constant
D.	none of the above
Answer» B. increases

Discussion

Explore topic-wise MCQs in Electrical Engineering.

The active materials on the positive and negative plates of a fully charged lead-acid battery are

The current flow through electrolyte is due to the movement of

Which of the following factors adversely affects the capacity of the leadacid battery ?

48 ampere-hour capacity would deliver a current of

Persons preparing electrolyte should wear

Capacity of dry cells is

Which among the following constitutes the major load for an automobile battery ?

The following indicate that battery on charge has attained full charge

Lead-acid cell has a life of nearly charges and discharges

Chargmg of sulphated battery produces ____ heat.

During the charging of a lead-acid cell

Internal resistance of a cell is due to

The ampere-hour efficiency of a leadacid cell is normally between

The effect of sulphation is that the internal resistance

Battery charging equipment is generally installed

The e.m.f. of an Edison cell, when fully charged, is nearly

The capacity of a battery is expressed in terms of

It is noticed that during discharging the following does not happen

Hydrogen evolved during charging produces explosive mixture when it is more than

Undercharging

When a lead-acid battery is in fully charged condition, the color of its positive plate is

In a lead-acid battery the energy is stored in the form of

Which of the following primary cells has the lowest voltage ?

Local action in a battery is indicated by

Specific gravity of electrolyte in Edison cell is

In a battery cover is placed over the element and sealed to the top of the battery container. This is done

The output voltage of a charger is

A dead storage battery can be revived by

The storage battery generally used in electric power station is

Internal short circuits are caused by

In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following

“The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”.The above statement is associated with

Over charging

Ampere hour capacity of an industrial battery is based on ____ hours discharge rate.

When two batteries are connected in parallel, it should be ensured that

Battery container should be acid resistance, therefore it is made up of

The watt-hour efficiency of a lead-acid cell varies between

The capacity of a lead-acid cell is measured in

Each cell has a vent cap

The specific gravity of electrolyte is measured by

A constant-voltage generator has

If a battery is wrongly connected on charge following will happen

When the load resistance equals the generator resistance which of the following will be maximum ?

Cells are connected in series in order to

Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as______materials.

The charge required to liberate one gram equivalent of any substance is known as ______ constant

In ______ system the charging current is intermittently controlled at either a maximum or minimum value

A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.

In constant-current charging method, the supply voltage from discharged to fully charged condition

In constant voltage charging method, the charging current from discharged to fully charged condition