Answer / ashli

when a motor rotates a back emf(E) is induced in the
armature which will oppose the supply voltage(V).. E is
proportional to the speed ie at zero speed there ll be no
back emf.. the current thro' the armature is (V-E)/R; where
R is the armature winding resistance(small value). at the
instant of starting speed is zero and so the value of E.
thus the current = V/R becomes very high.. once it attain
speed E is generated and current falls down

Answer / prakash suhane

During start motor requires high torque to get rated speed.
Requirement of high starting torque leads to large back
E.M.F and t6o overcome this back EMF high current flows
during starting of motor. once motor reached its rated
speed current reduced as per load current on motor.

Answer / rambabu

During start motor requires high torque to get stating load
is zero.also this will given lower o/p voltege per RPM.but a
higher current per phase

Answer / chreamz

During starting time, the motor acts like a blocked rotor.
The flux created on the armature turn to oppose that of the
rotor. Hence the motor amperage rises far beyond the
rating. It's estimated that, during starting time of the
motor, Operating Current = 6 times Norminal Current.

Answer / gaju

what is ripple component in ac supply?

1500Ah VRLA battery,if its weight is designed 125kg during maufacturing its weight is reduced to 85kgs,What will be impact on AH capacity,life & economy?

0 Answers   Bajaj,

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I want to know all basics of electrical engineering

0 Answers   RRB,

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For electrical designers what are the standard should know? i want learn about this standards. how to get information/reference. anybody help in this regards please.

0 Answers  

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the electric traction poles having 3 cables n two cables touches with a insulator (or any) another one separated but it will be running 1-phase why?

4 Answers  

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my self i am raghu working as tech.. in my college the maximum demand is 211 kva presently we are using 12kva capacitors the target power factor is .95 so what capacity of capacitor banks should i install

2 Answers  

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Compare salient pole and cylindrical rotor machines.

0 Answers  

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what is the purpose of CT,PT

8 Answers  

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In radial network the source is fed from 1 end both ends at central

0 Answers  

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I want to ask a question which i faced during testing of Capacitive Voltage Transformer in AIS. We have measured the C1 , C2 individually , but when we start to measure the total C1+C2 , the testing equipment shuts down and says low loading. Kindly is it possible to find the total capacitance by using measuring device. kindly briefly explain the procedure.

0 Answers   AIS,

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with the help of drive can we run the 50hz motor on 100hz,what will be its effect.

3 Answers   BPL,

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What about Reactive power.and role of that one?

7 Answers  

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Ammeter of 1 ohm resistance measure max 10 ohm to measure higher resistance from it

6 Answers   BARC,

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