Engineering Service Examination (ESE) 2013 Interview Experience - ECE-1

Date of interview-09/01/2014
Branch- ECE
chairperson- Manbir Sigh 

Question of chairperson -
1. Why jaipur is called pinkcity ? ( Becoz its my hometown )
2. What is Jai in jaipur ??
3. what is ur work profile (Explained About WPC )

Member 1 - 
1. How do u identify interference ?
2. how would u rectify the interference problems ?
3. what is internet ? (My hobby was internet surfing )
4. What is IPv4 and IPv6 ?
5. Difference Bet. IPv4 and IPv6 ?
6. Why we r switching from IPv4 to IPv6 ?

Member 2 -
1. Why use of computers increasing tremendously ? (my engineering branch was Computer Science)
2. what is the fastest processor ?
3. how many transistors r used in processors (Core I7 , Pentium 3 , Pentium 4
4. what does intel means ?
5. difference bet. vacuum Tube and transistors ?
6. Working of Vacuum Tube ?
7. Working of Diode ?
8. Is Diode can be used as a capacitor ?
9. Name of the diode which can be used as a capacitor ?

Member 3 - 
1. Have u heard the name of Slotted Lines ?
2. Superhetrodyne Receiver ?
3. power receiving at antenna in FM ?

Engineering Service Examination (ESE) 2013 Interview Experience - Electrical Engineering-1

Date of interview-07/01/2-14
Branch- Electrical
chairperson- D K Dewan

Questions by chairperson- 
1) What is constitution of India?
2) suppose u r traveling in bus.. suddenly a policeman stops ur bus and asked driver why u r crossing the speed limits.. How the policeman came to know that driver was over-speeding?
3) have u heard of women reservation bill? Tell me something abt that..

2nd member-
1) suppose u r given a charge of a substation and u have to set up a 25kv substation. List all the electrical equipments u ll need to set up a substation
2) Difference B/w isolator and circuit breaker
3) Explain the transients that occur in power system
4) what type of relays and CBs will be used in substation?
5) What is stability? 
6) Types of stability in power system
7) which one is large signal and which one is small signal stability... Differentiate them.

3rd member- 
He asked mainly about my hobby ( Watching shree mad Bhagvat katha on Television)
1) What is dis Shree Mad Bhagvat katha??
2) Who is the writer of dis book?
3) Who preaced dis nd to whom?
4) suppose u r selected in Indian railways as an IES, what steps will u take to deliver ur best in the job?
5) How will u implement preachment of BHAGVAT KATHA in ur Job?
6) suppose u find that there is a lot of corruption at the lower level, how will u tackle all that??/ Will u motivate ur lower employees to read Shree mad bhagvad??

4th member- 
1) asked about my Btech project ( I received a gold medal for my Btech project) 
2) on what factors power transfer capability of a transmission line depends?
3) what r copper losses?
4) Any other losses u know
5) Is it like Copper gets wasted in Copper losses?
6) why they r called as copper losses?
7) Have u heard of VLSI?
8) Difference B/w LED and normal diode?
9) Name the Chip of Microcontroller u used in ur project

Why Generator ratings are in KVA, where as motor ratings are in KW?

What is meaning of breaking capacity and making capacity of breaker? which should be higher?

Making capacity of a circuit breaker is the maximum current which the breaker can conduct at the instant of closing.  The making capacity is considered to the peak value of the first cycle when there is an imaginary short circuit between the phases.  When there is a short circuit in the line and the breaker is closed, the peak value of the first cycle is the most severe from an electrodynamic perspective.  This value is in kA.  The making capacity is expressed as a peak value as the dc offset during fault conditions is taken into account.
Making current is limited by the withstand capability of the contacts.
 

Breaking capacity of the circuit breaker refers to the maximum current in rms value the circuit breaker can interrupt.  This is also in the order of kA.   The making capacity of the circuit breaker is usually greater than the breaking capacity of a circuit breaker as breaking an electric circuit is difficult due to arcing which occurs and which has to be quenched.

Making Capacity=2.54 times of making capacity

What is meaning of 5P20 in Current Transformer(CT)?

CT's are categorized as Protection CT, Special Protection
CT and Measuring CT. Based on this, the CT's are  classified. Here is the meaning of the CT classes:

Class 5P20:

The letter 'P' indicates it is a protection CT.

The number 5 indicates the accuracy of the CT. Most common  accuracy numbers are 5 and 10.

The number 20 (called accuracy limit factor) indicates that  the CT will sense the current with the specified accuracy  even with 20 times of its secondary current flows in the  secondary. This is required for protection CT, because the  fault current is high and the CT should be able to sense  the high fault current accurately to protect the system.  The common numbers are 10, 15, 20 and 30.




Class PS:

PS is for 'Protection Special'. This class of CT's are used  for special protection such as differential protection,  distance protection etc.

Class 1M:

The letter 'M' indicates it is a measuring CT.

The number 1 indicated the accuracy of the CT. The  measuring CT's should be more accurate than the protection  CT. The most common accuracy numbers are 0.5 and 1.

what is merz price protection? Explain with Example?

What is Surge Impedance Loading (SIL) ? Explain With Example.

Surge Impedance 
If the line is loss-less, i.e. the resistance and conductance are zero, then the characteristic impedance reduces to √(L/C), a pure resistance. When dealing with high frequencies or with surges due to lightening, losses are often neglected and surge impedance becomes important.

Surge Impedance Loading (SIL)
It is the power delivered to a line by a purely resistive load equal to its surge impedance. When so loaded, line supplies a current of

Current is in Amperes (A) and |V| is line-to-line voltage at the load. Since, load is pure resistance,

in Watts (W)
or, with |V| in kVs,

It is sometimes convenient to express power transmitted in terms of per unit of SIL, i.e, the ratio of power transmitted to the surge impedance loading. For eg., permissible loading may be expressed as a function of SIL, and SIL provides a comparison of load carrying capabilities of lines.

In other way 

1) Transmission lines produce reactive power depending on line's capacitive reactance and the voltage at which the line is working at.

2)Transmission lines also absorb reactive power. This depends on the current that flows in the line and the line's reactance.

So Surge Impedance loading of a line is just the MW loading at UPF when

                  reactive power used = reactive power produced