Answer Posted / anuya

Basic & most important factor is transformer capacity which
can be derived by calculating all connected loads at
downstream. It will give the KVA rating.
Primary-secondary voltage ratio & vector group.
Environmental conditions like temp, etc. Application
Indoor/outdoor.
Cooling type requirement will deside the Xmer will be Oil
cooled or dry type unit.
Impedance of the Xmer.
Load type.

Why negative feedback is preferred in the control system?

1253

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A 500 V shunt motor runs at its normal speed of 250rpm when the armature current is 200A. The resistance of the armature is 0.12 Ω. Calculate the speed when a resistance is inserted in the field reducing the shunt field to 80% of normal value and the armature current is 100A.

2501

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how does a submersible pump work..?

1953

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Write down the name of 2 lady Bir Pratin of Bangladesh

1973

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one electromagnet is called

1910

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why on delay timer used for fully automatic star delta starter?

1685

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I Want randstand placement papers

1825

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direction of tarbine& genrator

2084

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How much load can take a 16 mm aluminum cable 3 phase

1747

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from which subjects most of the technical que will b asked for hpcl(electrical).pls help me

1997

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What is the cut-off rate?

1144

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Why derivative controller is not used in control systems?

1172

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when ac current flows thru d coil of a contactr,it energizes,magnetic field attracts d contact of the coil...nw wont dt ac current in d contct induce current back on to d coil thru mutual inductance leading to high currnt in d coil

1703

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I am an American living in Vietnam and I have recently gotten a refrigerator from Japan and it is rated for 100 vac, but the power here is 220 so I bought a voltage stabilizer it has a 1 kva output rating. Can you please tell me what the amperage is? I'm confused and without a working fridge.

1712

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Whether the vacuum contactor requires Short circuit protection?If No,why?

2033

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