198 + Mcqs in Electrolysis And Storage Of Batteries Page 2 McqOptions

51.	Weston standard cell at 20°C has voltage of ____ volts.
A.	0.8
B.	0.9
C.	1.0187
D.	1.5
Answer» D. 1.5

Discussion

52.	Sulphated cells are indicated by
A.	the loss of capacity of the cell
B.	the decrease of the specific gravity
C.	the low voltage of the cell on discharge
D.	all above conditions
Answer» E.

Discussion

53.	If a lead-acid cell is discharged below 1.8 V the following will happen.
A.	Capacity of cell will reduce
B.	Sulphation of plates will occur
C.	Internal resistance will increase
D.	All above will occur
Answer» E.

Discussion

54.	The substances which combine together to store electrical energy during the charge are called ______ materials
A.	active
B.	passive
C.	inert
D.	dielectric
Answer» B. passive

Discussion

55.	The common impurity in the electrolyte of lead-acid battery is
A.	chlorine
B.	dust particles
C.	lead crystals
D.	iron
Answer» E.

Discussion

56.	In alkaline cell the electrolyte is
A.	dilute sulphuric acid
B.	concentrated sulphuric acid
C.	NaOH
D.	kOH
Answer» E.

Discussion

57.	Dry cell is modification of
A.	Deniell cell
B.	Leclanche cell
C.	Lead-acid cell
D.	Edison cell
Answer» C. Lead-acid cell

Discussion

58.	As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its
A.	compactness
B.	lower e.m.f.
C.	small quantity of electrolyte used
D.	higher internal resistance
Answer» E.

Discussion

59.	During the idle period of the battery, strong electrolyte tends to change the active material of the cell into
A.	Pb02
B.	PbSC-4
C.	PbO
D.	Pb
Answer» C. PbO

Discussion

60.	Charging a sulphated battery at high rate results in
A.	boiling of electrolyte due to gassing
B.	warping of plates
C.	damage to separators, cell caps covers and battery case due to excessive temperature
D.	all above
Answer» E.

Discussion

61.	Five 2 V cells are connected in parallel. The output voltage is
A.	1 V
B.	1.5 V
C.	1.75 V
D.	2 V
Answer» E.

Discussion

62.	Negative plate of an Edison cell is made of
A.	copper
B.	lead
C.	iron
D.	silver oxide
Answer» D. silver oxide

Discussion

63.	Following will happen if battery charging rate is too high
A.	excessive gassing will occur
B.	temperature rise will occur
C.	bulging and buckling of plates will occur
D.	all above will occur
Answer» E.

Discussion

64.	Mercury cell has which of the following characteristics?
A.	Flat discharge current-voltage curve
B.	High power to weight ratio
C.	Comparatively longer shelf life under adverse conditions of high temperature and humidity
D.	All of the above
Answer» E.

Discussion

65.	As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
A.	reducing time of charging
B.	increasing cell capacity
C.	both (A) and (B)
D.	avoiding excessive gassing
Answer» D. avoiding excessive gassing

Discussion

66.	_______ of electrolyte indicates the state of charge of the battery
A.	colour
B.	mass
C.	viscosity
D.	specific gravity
Answer» E.

Discussion

67.	Excessive charging a battery tends to
A.	produce gassing
B.	increase the internal resistance of the battery
C.	to corrode the positive plates into lead peroxide thereby weakening them physically
D.	bring about all above changes
Answer» E.

Discussion

68.	The active material of the positive plates of silver-zinc batteries is
A.	silver oxide
B.	lead oxide
C.	lead
D.	zinc powder
Answer» B. lead oxide

Discussion

69.	Batteries are charged by
A.	rectifiers
B.	engine generator sets
C.	motor generator sets
D.	any one of the above methods
Answer» E.

Discussion

70.	On overcharging a battery
A.	It will bring about chemical change in active materials
B.	It will increase the capacity of the battery
C.	It will raise the specific gravity of the electrolyte
D.	None of the above will occur
Answer» E.

Discussion

71.	Cells are connected in parallel to
A.	Increase the efficiency
B.	Increase the current capacity
C.	Increase the voltage output
D.	Increase the internal resistance
Answer» C. Increase the voltage output

Discussion

72.	Electrolyte used in a lead-acid cell is
A.	NaOH
B.	only H₂SO₄
C.	only water
D.	dilute H₂SO₄
Answer» E.

Discussion

73.	The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is
A.	just one
B.	always greater than one
C.	always less than one
D.	none of the above
Answer» C. always less than one

Discussion

74.	While preparing electrolyte for a lead-acid battery
A.	water is poured into acid
B.	acid is poured into water
C.	anyone of the two can be added to other chemical
D.	none of the above
Answer» C. anyone of the two can be added to other chemical

Discussion

75.	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» B. decreases

Discussion

76.	Electrolyte used in a lead-acid cell is%!
A.	NaOH
B.	only H‚Äö√á√áSO‚Äö√á√ë
C.	only water
D.	dilute H‚Äö√á√áSO‚Äö√á√ë
Answer» E.

Discussion

77.	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

78.	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

79.	A dead storage battery can be revived by%!
A.	adding distilled water
B.	adding so-called battery restorer
C.	a dose of H‚Äö√á√áSO‚Äö√á√ë
D.	none of the above
Answer» E.

Discussion

80.	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

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

Discussion

82.	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

83.	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

84.	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

85.	*$_Sulphated cells are indicated by?
A.	the loss of capacity of the cell
B.	the decrease of the specific gravity
C.	the low voltage of the cell on discharge
D.	all above conditions
Answer» E.

Discussion

86.	*$_Electrolyte used in a lead-acid cell is?
A.	NaOH
B.	only H‚Äö√á√áSO‚Äö√á√ë
C.	only water
D.	dilute H‚Äö√á√áSO‚Äö√á√ë
Answer» E.

Discussion

87.	/_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

88.	/_Negative plate of an Edison cell is made of?
A.	copper
B.	lead
C.	iron
D.	silver oxide
Answer» D. silver oxide

Discussion

89.	/_During the idle period of the battery, strong electrolyte tends to change the active material of the cell into?
A.	Pb02
B.	PbSC-4
C.	PbO
D.	Pb
Answer» C. PbO

Discussion

90.	/_As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of?
A.	reducing time of charging
B.	increasing cell capacity
C.	both (A) and (B)
D.	avoiding excessive gassing
Answer» D. avoiding excessive gassing

Discussion

91.	/_The active material of the positive plates of silver-zinc batteries is?
A.	silver oxide
B.	lead oxide
C.	lead
D.	zinc powder
Answer» B. lead oxide

Discussion

92.	/_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

93.	/_In alkaline cell the electrolyte is?
A.	dilute sulphuric acid
B.	concentrated sulphuric acid
C.	NaOH
D.	kOH
Answer» E.

Discussion

94.	/_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

95.	/_Chargmg of sulphated battery produces ____ heat.?
A.	no
B.	very little
C.	less
D.	more
Answer» E.

Discussion

96.	/_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

97.	/_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

98.	/_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

99.	/_The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is?
A.	just one
B.	always greater than one
C.	always less than one
D.	none of the above
Answer» C. always less than one

Discussion

100.	%_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

Explore topic-wise MCQs in Electrical Engineering.

Weston standard cell at 20°C has voltage of ____ volts.

Sulphated cells are indicated by

If a lead-acid cell is discharged below 1.8 V the following will happen.

The substances which combine together to store electrical energy during the charge are called ______ materials

The common impurity in the electrolyte of lead-acid battery is

In alkaline cell the electrolyte is

Dry cell is modification of

As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its

During the idle period of the battery, strong electrolyte tends to change the active material of the cell into

Charging a sulphated battery at high rate results in

Five 2 V cells are connected in parallel. The output voltage is

Negative plate of an Edison cell is made of

Following will happen if battery charging rate is too high

Mercury cell has which of the following characteristics?

As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of

_______ of electrolyte indicates the state of charge of the battery

Excessive charging a battery tends to

The active material of the positive plates of silver-zinc batteries is

Batteries are charged by

On overcharging a battery

Cells are connected in parallel to

Electrolyte used in a lead-acid cell is

The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is

While preparing electrolyte for a lead-acid battery

During charging the specific gravity of the electrolyte of a lead-acid battery

Electrolyte used in a lead-acid cell is%!

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

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

A dead storage battery can be revived by%!

Over charging%!

The specific gravity of electrolyte is measured by%!

Cells are connected in series in order to%!

Undercharging%!

Local action in a battery is indicated by%!

*$_Sulphated cells are indicated by?

*$_Electrolyte used in a lead-acid cell is?

*/*_The e.m.f. of an Edison cell, when fully charged, is nearly?

*/*_Negative plate of an Edison cell is made of?

*/*_During the idle period of the battery, strong electrolyte tends to change the active material of the cell into?

*/*_As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of?

*/*_The active material of the positive plates of silver-zinc batteries is?

*/*_The watt-hour efficiency of a lead-acid cell varies between?

*/*_In alkaline cell the electrolyte is?

*/*_The ampere-hour efficiency of a leadacid cell is normally between?

*/*_Chargmg of sulphated battery produces ____ heat.?

*/*_Which among the following constitutes the major load for an automobile battery ??

*/*_48 ampere-hour capacity would deliver a current of?

*/*_The active materials on the positive and negative plates of a fully charged lead-acid battery are?

*/*_The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is?

%_In constant-current charging method, the supply voltage from discharged to fully charged condition_%

/_The e.m.f. of an Edison cell, when fully charged, is nearly?

/_Negative plate of an Edison cell is made of?

/_During the idle period of the battery, strong electrolyte tends to change the active material of the cell into?

/_As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of?

/_The active material of the positive plates of silver-zinc batteries is?

/_The watt-hour efficiency of a lead-acid cell varies between?

/_In alkaline cell the electrolyte is?

/_The ampere-hour efficiency of a leadacid cell is normally between?

/_Chargmg of sulphated battery produces ____ heat.?

/_Which among the following constitutes the major load for an automobile battery ??

/_48 ampere-hour capacity would deliver a current of?

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

/_The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is?