Answer Posted / kaushik

In case of dc motors ,if provided with ac supply will run because in every halfcycle the polarity of field and armature winding will change simultaneously so that torque will be in same direction (regardless wether it is series or shunt motor) but the field winding will be hotter as they are not laminated (as they are designed for working with dc) so excess heat will produce due to eddy current.

WHat is the requirement of installing FAST ACTING EARTH SWITCH in GIS and how is that integrated with protection system. How and when does it operate?

2242

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if two transformers are placed parallel & both have fault impedance of 50KA will it increase or decrease show example?

2052

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What is the current carrying capacity of 35sq.mm flexible cable?

1512

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I WANT TO know WHICH WAY IS BETTER FOR CONNECTION BETWEEN POWER TRANSFORMER AND MAIN DISTRIBUTION PANEL. 1-IS BETTER WE USE CABLE? 2-IS BETTER WE USE BUS DUCT? my transformer rate power is 2500KVA

3309

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how can i get the formula to find out the cable size if i know the load of main fuse protection.

1984

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can anyone explain the star-delta motor control wiring ,which wire go where and how they operate?

1500

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HOW TO CALCULATE THE HEAT AND LOAD OF LT-SUBSTATION WHICH CONTAINS 2*1MVA TRANSFORMERS,LT-SWITCH BOARD,MLDB,ACB,BUSBAR,ETC,......?

2159

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Briefing the effects of ASR and ACR of a double closed-loop speed regulating system.

2285

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how to calculate energy of 3-phase motor?

2160

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if the armature current in a dc generator is ac ( sinusoidal ) why doesnt the sjhape af armature mmf a sinusoidal (ni) ? armature mmf in case of a dc machine is triangular.

2028

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what is difference between elr and R eartl realy.

2705

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The ripple frequency in output of fullwave bridge rectifier is a. Half the input b. Twice the input c. Same as input

2312

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Define ampere

1377

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Why to keep capacitor bank off while generator running.

1850

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why we are using earth pit in sub stations.?

2227

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