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

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

On what principle reluctance motors work?

1 3922

What is the difference between magnetic loading and electric loading of a machine?

2 36552

How the size of electic machine vary with the sped? Between slow and fast running machines of equal ratings, which one is more economical to design?

1 3431

what is the relation between frequency and inductive reactance in a d.c supply?

L&T,

2 6941

Why machines are avoided to work is saturation region of B- H curve?

3 5748

Why different values of B’s (magnetic flux density) are chosen for DC machines and Induction Motors?

1 3170

How the output,losses and temperature of machines varies with linear dimension?

1 4821

Why air gap in rotating machines should be small?

3 7728

Why rotating machines are not allowed to run near critical speed region?

2 6519

From stability point of view,What(higher/lower) should be the value of inertia constant of rotating machines?

1 3716

how to reduce humming noise in transformer?

3 10116

There are two nos of 33Kv/11Kv 5MVA transformers conecting through HT cable from substation having metering at substation itself.One transformer used at a time another remains stand by.Further 11 nos of 11Kv/440V transformers are attached on it and each transformer is having its own Power factor correction panel.Now one 33/11Kv transformer at no load condition/Stand by condition is having power factor in leading side upto 0.21 and while when another tranformer at same situation have power factor in lagging 0.42. Now one thing is clear that transformer one is having 1.5 Km long 33kv cable due to that PF goes in leading side and another is having only 250 mtr length remains him lagging. Now i want to know that how i can maintain the Power factor at no load/ stand by position though both are behaving in seperate manner.

1 6701

Why oil preferred over the air as a cooling medium for high rated transformer?

1 4301

What is emperical relation.Name few of them which are used in electriacl engineering?

1 4106

In the ACB breaker capacity is 2000Amp but this each phase taken 1250 But total beldibg load is 600amp or 700amp watt is the problem

1928

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Un-Answered Questions { Electrical Engineering }

Define step response?

1118

Why is voltage is required to be within permissible range for an electrical equipment?

1663

Power factor =1.000 at factory in supply. However, PF = 0.8 at motor end. Current = 100 Amp, Voltage = 400 V. What is the power distribution loss? Can I reduce it by adding capacitor at the load feeder?

2017

What is CCT (Correlated Color Temperature) ?

1920

what is the difference between earth leakage and earth fault?

2271

how are reversing the direction of rotation of dc motor

1729

What is a surge supressor why its is used in synchronous generators

1978

What is the difference between diesel generator engine with and without turbo charger with the same capacity?

1641

Define active filter?

980

What is the basic principle of welding process?

2107

how many joint can done in HT line and what is life of the joint

2187

Vibromotor 252MV 1/4HP2P..what is mean by 252MV?

1925

in electrical control panel. how can i choose the cable rating. (example - 11kw motor, 18-25A mpcb}

2815

The loads are connected with phase and ground then why current flow as the loads ?

1927

how does a submersible pump work..?

1914

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