If anyone would like to know or practice for FEWA papers contact me on mohamedrashad2@hotmail.com Just completed the supervisor exam in April 2021

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Is Indian railway uses 25000v ac or dc?

7 Answers  

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battery capacity use of made?

0 Answers   JLL, Shankar Electricals,

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how to select short circuit current while selecting a MCCB? how to calculate current for a given KVA and KW load?

2 Answers   GE, PnU Engineering,

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what is the necessity of under ground cables ??

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there are a transformer and a motor. both are connected to 3phase, 415 Volt, 50Hz power supply. Both are working with induction principles. Then, why, motor is rotating and transformer is not rotating.

8 Answers  

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why should we india maintain frequency of 50 Hz.

8 Answers  

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How will you calculate the correct KWH value if your CT is 600/5 and your KWH meter is rated for 100/5

1 Answers   L&T,

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What, in the construction of a transformer, controls KVA? For example 600/208/120 V transformer can be 10kVA or 45kVA!!! What do we change in the construction of a Transformer in order to change the rating but not the voltage.

1 Answers  

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1.After synchronising the alternator to the grid,how we r delivering power to the grid?if the i/p increases does the speed hence frequency increases? 2.y the power factor is changing when exitation changes?what is the relation with p.f and flux?

4 Answers   BSNL,

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Is there any rule to select the voltage of motor based on KW rating? What is the rating above which lt motor becomes the HT motor?.

0 Answers   DAE,

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Which is the best protection in case of shortcircut fuses or mccb ?

2 Answers  

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