Answer Posted / engineered

Factors for selection of cable
1.Rated current
2.voltage drop across cable
3.derating factor based on temprature,no. of cables laid
through same path influencing each other
4. Type of laying method:- like air, ground, duct, tray,
raceway
5. type of conductor required.
6. type of insulation, like PVC, XLPE, FRLS based on site
condition

What shall be the secondary output voltage if the primary winding of a 220/6V, 50 Hz transformer is energized by an 110V, 60 Hz supply?

1376

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What will happened if the neutral of secondary of Xformer ( Star point) Note it's above KVA rated Xformer

1893

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Mention the disadvantages of low power factor? How can it be improved?

1155

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what will happen if ac and dc supplies given

2136

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An impedance of 100 ohms resistance and an unknown inductance is connected across the capacitor. The resulting impedance is a pure resistance of 500 ohms ifω = 10^5 rad/sec. calculate the values of inductor and capacitor.

1427

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what is the value of combined earthing in general electrical circiut?

1910

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PLS SEND THE RRB CHENNAI MODEL QUESTION PAPER my email id is ganesan98655@rediffmail.com

2018

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What is non-minimum phase transfer function?

1312

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is this the formula of building wiring to get the main breaker.Watts/volts*.8%+higher motor*(25%)=ampere. yes or no or send the correct formula for building wiring.

1716

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What is the effect on power factor, shown by a trivector meter; incase of reverse phase sequence. If the power factor of a system is lag what meter will show in case of reverse phase sequence connected to the meter. and What in case of lead.

2321

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What is the numerical quantity of sqcm?

2033

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How two nos. 130 kw D.C motor get synchronise using D.C drive.

2132

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different aspects of voltage stability

2067

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How to calculate Ith (I thermal) for curent transformer

2086

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why does the magnetic balance tests at transformer?

1946

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