Answer / shankar

by using a capacitor and rely
or by using 555 timer
or by using two transister

Answer / manish kumar janagal

also by using a 1 phase alternator connected to 1-phase
supply in such a way that it's frequency is just less than
the supply frequency

For single phase(phase to neutral) having potential difference 230.in three phase(phase to phase)we have 440V HOW...?

1 Answers  

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How you calculate the repturing capacity of a HRC fuse

0 Answers   CPCL, RSCL,

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Based on CPI/CGPA they shortlist the candidates & than directly start Interview so there is no Written Exam or GD Only PI.Interview held @ MNNIT , ALLAHABAD On-Campus on 6th,Aug, 2007 & the Questions asked to me by Interview Board ( 4 People) are from HR/SummerTraining/BTP/Subject-core, POWER SYSTEM & MACHINE. time duration of I/V is about 15-20 Minutes. HR- Q.1 Name,hobbies & About family background ? Q2.What u know abt NTPC ?? Q3.Why u want to choose NTPC as ur Carrier's starting i.e power sector not any other Oragnisation or sector ?? Techincal Questions- Q1.What is the reason for transformer Noise ?? Q2.Which material is used for making Transformer oil & How u measure its dielectric strength & Name the test ? Q.3 Which Machine u will prefer 2 use if flammble gases are coming out at a place & why ?? Q4.What is relation b/w Transmission Lines & Communication Lines ? Q5.What is the maximum capacity Synchronus Machine & total powerGeneration in our country ? Q.6 In india Power generation is at 50Hz while in America its 60 hz ,why so ?? Advantage or disadvantage ?? Q.7 Maximum Generation Voltage in india ? Q8. What is the Voltage regulation & why its required n how much is permissible ? & causes of voltage variation ?? Q.9 Why electric shock is feel ?? n in a Electric Train why we didnt feel that ? Q.10 Have u seen/ experience of any power plant/ industry related to the power sector ? so these are the questions which not too diffcult i think was asked to me.

6 Answers   NTPC,

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what ll happen to current if two phases get short circuited

2 Answers   Kirloskar,

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features of hbc fuses

0 Answers  

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1.what is the contact resistace of CB ? 2.radioactivity should be mesured with---------?

3 Answers   Power Grid,

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The SFC of an engine is 0.25 kg/kW hr. when the fuel used has a calorific value of 36000 kJ/kg. the thermal efficiency of the engine is

0 Answers   Caterpillar,

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what is the difference between ac and dc?which one is more efficient?and what r their advantages

1 Answers  

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why we used ZNO in Lightning arrester.

0 Answers  

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what is the maximum rating(KVA) of transformer can be used in distribution side..(11KV/440v) and why??

1 Answers   Jindal,

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What is Plank's Law?

0 Answers   Godrej,

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What is a circuit breaker contact multiplier relay?

2 Answers  

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