Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

Difference between online and offline UPS?

11 27480

How to calculate earth flat size for 250 Kva DG and transformer?

Deepak Fertilisers,

8 36658

can we use HPSV LAMP in HPMV LAMP fixture ?and viseversa.

OPS,

5 13920

Why motor initial starting current is high?

Pennar,

9 63832

megger generates D.C. voltage while earth tester generates A.C.voltage is it true? I know for megger it is D.C generator but what about earth tester?

IOCL,

4 25907

What is the cause for a blown fuse in one phase of primery side(HV) of a three phase transformer( 4169v-460v) in the time of closing its supply breaker. There is no load on the secondery side of the transformer in this moment.

Novachem,

3 13577

iam using DM 3251 voltmeter(1 percent accuracy)for 11KV system PT ratio is 11KV/110V.can anybody explain what is the max and min voltage deviation.

2312

What is mean by Sub Synchronous Resonance(SSR)???

1 4708

Will sag depends on the Specific Resistance of the conductor?if not Why??????????

BARC,

2 5633

how to calculate the neautral earthing conductor size for a 500kva dg set.

2 12420

What are the implications when the power factor is is leading condition ?

1 3365

What is double delta conection in AC Motor? And can we done the double RPM of the motor by double delta conection?

vguard,

1 13037

How to control speed of DC motor with AC power?

vguard,

7 13788

why transformer is giving some humming noise .....?

Electrotherm, JSW,

11 31877

when the rheostat kept in minimum to maximum position in motors what will happen?

7 18765

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Un-Answered Questions { Electrical Engineering }

(In MEP services) HVAC in AC Plant room what else can we provide if the chiller is not considered?

2104

WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEMENT CHANGES IN TRANSFORMER?WHAT IS THE NEED TO BE PHASE SHIFT CHANGE BETWEEN THE PRIMARY AND SECONDARY WINDING

1862

Is it true that in the 3 phase transformer, the limbs of the core are at 45 dgrees to each other. if true, why?

2131

why effective resistance should be more than static resistance in transmission line?

2155

what is a composite error in current transformers, why occurs & in which it will occur i.e, either metering ct/ protection ct

1914

Why syn. Generators are used for the production of electricity?

1212

is IS says that neutral should be brought to switch box. and this one is a recomended practice

1922

What is meant by RVT and NDR ? expansion and details of it

3112

along with technical test papers

1663

why the earth is taken minimum in supplying? wather it the proportional factor to getting work any equipment or a power plant?

1958

Why is a plain induction motor unsuitable for wide speed control?

2328

i have attended the interview on 4th June,08 at Kolkata in IOCL, can anybody tell me what is its result

2032

what do you mean by class PS CT and what are technical details needed for calculating it?

2054

Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

2226

how the aircraft outer body and inner body is separated ?

1120

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