Answer Posted / p.aruna devi

Unwanted signal is known as harmonics .it generate due to
double the frequency.

Why is it prefer to initiate circuit breaker failure by "86" lockout relay not by "94" tripping relay ?!

1843

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1.how many types of relays? 2.difference between ATS& STS?

2198

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design a LV scheme for a 15 storied building?

2012

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following are the questions asked in interviews: 1) Considering the short circuit fault, which switchgear is preferable, SFU OR MCCB? Which operates faster? whicg one is popular in Indian Market and why? 2)Define SCPD. What is type2 coodination? 3)Why the contactor rating is higher for the fuseless selection than for fuse selection? whether the ratinf of SFU or MCCB remains the same in both the cases? 4)If the HP rating is known then can you calculate the ratings of L.V Switchgear(SFU/MCCB, contactor, OLR) without using the selection chart?

2119

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how to identify the cable quality and what is flame proof cable

2160

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Why in ESP Positive earthed

3151

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when measure the core loss of three phase distribution transformer or three phase reactor loss, one phase shown negative watt loss. why??

2038

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What are the advantages of vscf wind electrical system?

1140

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what about electrical pannel.? What is meant by plc pannel.?

2360

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how meger function

2939

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1.what is difference in maintain Hz again Hz in USA ? 2.how to calculate the battery AH? 3.why are yearly maintained in transformer how many tests in required?

2824

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If Neutral Grounding Resistor (GR) failed/shorted. Is it repairable.

1685

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What was the Dg set radiator and lube oil temperatures trip in ACB

1879

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The electrical energy required to raise the tempreture of a given amount water is 200 kwh. If the heat losses are 20%, the energy required is?

2067

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how the speed of the gets motor regulated. does it draw the same current on the all speed level.

2030

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