Most common form of A.C. meters met with in every day domestic and industrial installations are
induction type single phase energy meters
all of the above
commutator motor meters
mercury motor meters
induction type single phase energy meters
A potentiometer may be used for
All
measurement of current
measurement of resistance
calibration of ammeter
All
While preparing electrolyte for a lead-acid battery
none of the above
acid is poured into water
water is poured into acid
anyone of the two can be added to other chemical
acid is poured into water
When two batteries are connected in parallel it should be ensured that
they have same e.m.f.
they have same make
they have same ampere-hour capacity
they have identical internal resistance
they have same e.m.f.
A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.
2.9
1.5
1
2.4
2.4
Which of the following primary cells has the highest voltage ?
Manganese-alkaline
Carbon-zinc
Lithium
Mercury
Lithium
Chargmg of sulphated battery produces ____ heat.
more
less
very little
no
more
Excessive charging a battery tends to
bring about all above changes
increase the internal resistance of the battery
produce gassing
to corrode the positive plates into lead peroxide thereby weakening them physically
bring about all above changes
Shelf life of a small dry cell is
none of the above
less than that of large dry cell
equal to that of large dry cell
more than that of large dry cell
less than that of large dry cell
Hydrogen evolved during charging produces explosive mixture when it is more than
0.08
0.02
0.04
0.06
0.08
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