Answer Posted / xeeshan.raza

Harmonics is the sudden increase in the system voltage it
is caused by addition of unwanted frequencies to the
sinusiodal waveform of ac system . the odd multiple harmonics like 3rd 5th 7th are most dangerous

what are the types of electromagnetic forces developed in practical transformer?

2635

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Air circuit breaker safety

1424

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Differentiate between ideal and non-ideal voltage sources?

1090

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Why should be the frequency 50 hz 60hz only why not others like 45, 95 56 or anything , why should we maintain the frequency constant if so why it is only 50 hz 60hz?

1143

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Explain the operation principle, advantages and disadvantages of the following converters: a) A 12 pulse converter b) A Switch-mode inverter c) A thyristor inverter

2055

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What is the cut-off rate?

1163

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RESPECCTED SIR/MADAM- I AM PRERING FOR SECTION ENGINEER (ELECTRICAL) RRB CHANDIGARH PLEASE SEND ME SOME PREVIOUS YEAR QUESTION PAPER OR MODEL PAPER.MY EXAM IS ON (30- NOVEMBER 2008).I AM VERY THANKFUL TO YOU. FROM- HARENDRA SINGH YADAV

2102

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How can you sized or estimate the ligthning arrester current rating?

2139

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if i am in front of transmission line how to know that current direction without any equipment

1776

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What is the difference between vector surge relay (78) and Pole slip relay (98G)

1211

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What is the implications when 600 hp motor is started when the unit is running with Transformer of capacity 1500 KVA and DG set of 1000kva

2219

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What is the best thing to protect the motor from running over full current. CT or O/L or pressure transducer at the given pressure rating

1544

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what precautions to be taken while desigining a LT,HT panel. Eg-LT panel PCC panel with ACB installed. HT panel VCB panel with VCB installed. & what is main diffrence betwn IP54 & IP55 construction of panel.

3051

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Define active filter?

1030

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in shunt clippers why a resistor is used in sereis with the input

2100

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