Question is ⇒ For a group of cells when internal resistance of the group is equal to external load resistance, the group will deliver maximum, Options are ⇒ (A) voltage., (B) current., (C) ampere-hours., (D) efficiency., (E) , Leave your comments or Download question paper.

Question is ⇒ For a group of cells when internal resistance of the group is equal to external load resistance, the group will deliver maximum, Options are ⇒ (A) voltage., (B) current., (C) ampere-hours., (D) efficiency., (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	For a group of cells when internal resistance of the group is equal to external load resistance, the group will deliver maximum
A.	voltage. [Wrong Answer]
B.	current. [Correct Answer]
C.	ampere-hours. [Wrong Answer]
D.	efficiency. [Wrong Answer]
View Answer 6 -7 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Capacity of a dry cell is
more when it supplies current continuously.
more when it supplies current intermittently.
not affected by the type of discharge.
none of the above.

⇒ Cells are connected in parallel in order to increase the
life of the cells.
efficiency.
current capacity.
voltage rating.

⇒ What causes lower efficiency of alkali cell as compared to the acid cell ?
Lower emf
Small amount of electrolyte
Longer life
Higher internal resistance

⇒ The capacity of a lead acid battery does not depend upon
charge rate.
discharge rate.
temperature.
density of electrolyte & quantity of active material.

⇒ If the specific gravity of the electrolyte in a lead acid cell increases beyond 1.23 there will be
loss of life.
loss of capacity.
increase in internal resistance.
corrosion of the grids of the plate.

⇒ During discharging of lead acid cells, the terminal voltage decreases with the decrease in
temperature.
discharge rate.
state of charge.
none of these.

⇒ Pickling is
protection of surface from rusting.
a layer coating for preventing surface deterioration.
removal of scale, grease etc. from the surface.
none of the above.

⇒ The emf of primary cell depends upon the
physical dimensions of a cell.
nature of electrolyte.
nature of electrode.
both (b) and (c).

⇒ Which of the following statements is incorrect about lead acid batteries ?
The electrolyte in weak sulphuric acid.
When fully charged both of the plates become lead-per-oxide.
The number of plates is always odd.
The number of negative plates is one more than the number of positive plates.

⇒ The arrangement of 12 cells, each of internal resistance 1.5 ω, to give maximum current in external load resistance of 2 ω will be
all 12 cells in series.
all 12 cells in parallel.
4 cells in series with 3 rows in parallel.
3 cells in series with 4 rows in parallel.

⇒ In a lead acid battery, excessive formation of lead sulphate occurs due to
idleness of battery for a long time.
low level of electrolyte.
persistent undercharging.
all of the above.

⇒ Which of the following substances on adding in electrolyte helps in producing bright finish?
Glycerine.
Dextrol.
Phenol.
Any of these.

⇒ Which of the following acts as depolariser in Lechlanche cell ?
MnO₂
NH₄Cl
Mn₂O₃
ZnCI₂

⇒ Standard cell
will have precise and accurate constant voltage when current drawn from it is few microamperes only.
will have precise and accurate constant voltage when few milliamperes are drawn from it.
will continue to have constant voltage irrespective of loading conditions.
can supply voltages up to 10 V.

⇒ Rust, scales and oxides can be removed from a surface with the help of
various acids.
alkali and salt solution.
mechanical abrasion.
electrolytic cleaning any of the above.

⇒ What carries current in an electrolyte
Electrons only
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+ ve ions only
Both + ve and - ve ions

⇒ In which of the following cells polarisation is the major defect ?
Voltanic cell
Lechlanche cell
Daniel cell
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⇒ For keeping the lead acid battery terminals free from corrosion it is advisable to
keep electrolyte level low
apply petroleum jelly.
charge the battery at frequent intervals.

⇒ During charging and discharging of an Edison cell
electrolyte does not take part in chemical reaction.
emf remains the same.
corrosive fumes are produced.
nickel hydroxide remains unsplit.

⇒ Nickel-cadmium accumulators in comparison to nickel-iron accumulators have the advantages of
being lighter in weight and cheaper in cost.
low internal resistance and longer life.
higher emf and higher efficiency.
all of the above.

⇒ In a lead acid battery, fillers are provided to
facilitate flow of gasses
prevent flow of gasses.
recover acid losses through vapours.
reduce tendency for polarisation.

⇒ For achieving uniform thickness of deposit on irregular surface
anode and cathode are kept farther apart
anode and cathode are kept closer.
high current densities are used.
electrolyte is agitated constantly

⇒ The energy capacity of a storage battery is rated in
kWh.
kW.
ampere hours.
joules.

⇒ The condition of a fully charged lead acid battery cannot be ascertained by
gassing.
voltage.
colour of the electrodes.
specific gravity of the electrolyte.

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abnormal high temperature.
low specific gravity of the electrolyte.
all of the above.

⇒ The ratio of the number of hydrogen to that of oxygen atoms liberated in the electrolysis of acidulated water is
1 : 4
1 : 2
2 : 1
4 : 1

⇒ Which of the following tests is performed for ascertaining whether the battery plates are defective or not?
Specific gravity test.
High discharge test.
Cadmium test.
None of the above.

⇒ The current capacity of the charged secondary cell does not depend on
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Temperature
Amount of active material
Rate of charging

⇒ The emf of a lead battery
increases with the increase in specific gravity of the electrolyte.
slightly increases with the increase in temperature.
decreases with the increase in temperature.
both (a) and (b).

⇒ Battery charging equipment should be installed
in well ventilated, clean and dry place.
as near as practical to the battery under charge.
both (a) and (b).
wherever convenient.