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Electrical Engineering Interview Questions

How we can calculate what type of supply we need for an example sometimes we take 11 KV and sometime 33KV from EB ?

4115

what type of current supply is given to house holds?

13971

What is a formula to decide the size of the cable of the star delta motor ( From Contactor to the motor 2 runs )

3533

How to decide the size of the capacitor for a single phase induction motor say 2 HP ??

1094

1.After synchronising the alternator to the grid,how we r delivering power to the grid?if the i/p increases does the speed hence frequency increases? 2.y the power factor is changing when exitation changes?what is the relation with p.f and flux?

BSNL,

7529

WHAT WILL HAPPEN WHEN THE MOTOR FREQUENCY INCREASED OVER THE RATED MOTOR RPM THROUGH DRIVE?

4702

how many stairs have you climbed while you were coming

Bhel, SSB,

1181

what is the voltage of insulation megger that should be used for measuring the resitance of 66kv equipments.

DEWA,

6075

for a 33/11kv transformer, after step down what happens to the balance 22kv.

3617

what is full form of google

IBM,

6647

Dear all, I want to use Induction motor to open and close a 1 ton door. How much power do I need. Thanks

929

what are the available sizes of pin type terminal lugs in the market today?

931

what is automatic voltage regulator?we can control the vlotage by using fuzzy controller in matlab?why we go for fuzzy?

DEWA,

1062

Why not instal the NGR in 11kv/433kv trasformer?

3703

How to calulate the NGR resistance ?

L&T,

3435

Un-Answered Questions { Electrical Engineering }

What is Delta Connection? What is meant by Forward Delta & Reverse Delta & How Will be the Connection in Power Transformers?

1302

what is the difference between the characteristics of two different phase bushing of any transformer

879

How to protect a Dosing pumps/any sensitive equipment (single phase) from surge protection inside a food factory.

809

What is a parabolic signal?

133

why we have and use 3 phase not 2 or 4 or other in power system?

1224

What is bode plot?

194

7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

1302

quantizer means?

1066

Metal covered multiconductor cables shall employ a marker tape located within the cable running for its complete length in lieu of cable surface marking. Is it true or false?

1177

how can motor both beasrings insulation resistance can be check?

1060

Which type of motor is used in trains, what is the rating of supply used explain working principal?

182

how external lighting design? please give examples?

983

why we are using in reverse power relay in generator singranizing

1235

What is minimum permicible value of leackage current for LT Panle when applying voltage up to 3 KV for 5 Minuits?

1149

How can we calculate the efficiency of a Running (On-Load) Motor ? What parameters are required and what is the method ?

1082