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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
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- NTPC, I also Faced
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Answers were Sorted based on User's Feedback
Answer / shivangi
for Q no.4
The technical field relates generally to a transmission
device for transmitting a signal through a transmission line
between circuit blocks having different power supply systems
and to a semiconductor integrated circuit for communications
suitable designed to communicate by using a differential
voltage signal between communication lines.
| Is This Answer Correct ? | 2 Yes | 1 No |
Answer / jiten sharma
For question 4:
Transmission line is basically used to transmit the power
for long distance. the voltage rating for transmission is
different based on the distance between the sending and
receiving end station i.e. 66 kV, 132 kV, 220 kV, 400 kV
now days in india we are developing the grid at 765 kv
voltage level also.
While the communication line is basically used for transmit
the signels from sending end to receiving substation with
the help of PLCC (power line carier communication). which
is part of transmission line. High frequency singles are
super imposed with transmission line which are used for
comunication and protection purpose.
Regards,
Jiten sharma
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / divya
Can you please give me the answer for Q) 3, 5, 7, 9
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer for Q1
when we will give the supply at primary side the transformer core will COMPRESS and ELONGATION and this
is called MAGNETO DESTRUCTION,DUE to this reason the transformer make noise.
| Is This Answer Correct ? | 0 Yes | 1 No |
1.when in a transformer its varnish become burnt, than air
surrounds the space and it works as a capacitor,thats why
noice is occured.
2. transformer oil dielectric strenth is measured by Break
down voltage test.
| Is This Answer Correct ? | 1 Yes | 8 No |
What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer?
what is diffence between synchronus and asynchronus AC motor.?
how to calculate the current if i know power in MW and voltage 11kv/415v and also want to know that incoming cables for trnsformer
6 Answers Daikin, KOC, Reliance,
our scope called one core cable for distribution system so we like to use 4 core cable with one equipment grounding conductor so what kind of technical reasons i can say that the 4core is better then 1 core,
What is GNR ? How much value of ground neutral resistance?
How to know the Max. current caring capacity of the cable by its size ?
The cable area of cross section is 185 sq mm. How to convert this to the diameter.
what is frequancy
what is appearent power?
what is Over current, earth fault (O/C+E/F) ?
What are the Formula of computing Back up Time of 500kVA UPS with 4 Battery Banks, each bank composed of 43 pcs of Batteries 12V150Ah. How to compute the Back up Time of UPS? We have also 3X500kVA UPS running in Parallel same composition as I write above.
Why high voltage lines (overhead ) are called high tension lines?
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