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Standard XII
Physics
Two Parallel Currents
92.An electri...
Question
92.An electric motor operate on 50V supply and current of 12A if the efficiency of motor is 30% what is resistance of winding of motor?
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Q.
An electric motor operating on
50
V
D.C. supply draws a current of
10
A
. If the efficiency of the motor is
40
%
, then the resistance of the winding of the motor is:
Q.
An electric motor operates with an efficiency of
90
%. A pump operated by the motor has an efficiency of
80
%. The overall efficiency of the system is:
Q.
An electric motor driven pump fills an overhead tank placed at a height of 20 m from the ground-level sump at a rate of 20,000 litre water per hour.The motor has an operating resistance of
22
Ω
and is connected across a 220 V source.The efficiency of this motor is (Use
g
=
9.8
m
/
s
2
)
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