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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is differance between PT-100 and thermocouple?

1 6545

Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............

942

I have a table fan of Rallifan Make. When I overhauled it I found a stator winding and an aluminum die cast rotor. So it is supposed that it is a 1 phase induction motor. But there are only two terminals coming out and there is no capacitor. Can any one tell how this motor works? or which type of this motor is?

1 2697

On the secondary side of a distribution transformer, we use 1c x 630 sq mm cable. Why dont we use 4 core cables instead of 1 core cables on the secondary. Why we use aluminium cable glands on the outgoing instead of brass cable glands?

Siemens,

2 8078

Can we use BS 6651 and BS EN 62305 standards for computer room lightning ptotection in substation?

Jindal,

1232

Why we transmit the power at the voltage in the multiple of 11 or 1.1 like 11kv, 22kv, 66kv, 132kv...... some one told me that it is due to fomr factor 1.1 of sine wave. its fine but while transforming we can choose any voltage, so why only multiple of 1.1 there also.......? plz tell me.

7 4036

avr is an automayic voltage regulator ... it regulates voltage before it synchronise with grid after synchronisation it regulates power factor why....

7 5069

What is the difference between Off line UPS and Line interruptible UPS?

Etisalat,

1 2971

Do we really need wheels for the transformer

1 1946

Is motor current is dependent on load.

2 2690

how to calculate the current carrying capacity of a conductor. How it is related to diameter of cable or conductor

AGC, BARC,

3 10891

How o select the electrical fuse?.What are its characteristics.How to select the material od fuse?

BARC,

1023

Why only three phase power generation are load are used

BARC,

2 4576

where is the need for short circuit test for 3 see is required and why? can you explain in brief with application

966

I want to know in body earthing which material can be use either copper plate or GI plate please guide us which is best option.

3 2712


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Un-Answered Questions { Electrical Engineering }

How to select HT/MV cable size ?

1497


how to define tell me about self

1034


Why to keep capacitor bank off while generator running.

773


distribution is maximum done by a)radial b)network c) parallel d)b & c

1037


How to select the cable and voltage drop in circuit?

675






Explain the purpose of inductor in an electric circuit?

167


Explain the working of any one cutting machine

180


how to calculate transformer turn primary & secondary side 11kv to 420v

1239


In TNC switch, is there any 1NO+1NC block ? and if we move over closing position, is ther any affect on trip position or vice versa?

1263


If I want to buy a new Xformer for my plant what are the main parameter will I need to check?

986


difference between a diode and thyristor?

1282


how to measure earth resistance of a substation

2160


how do we calculate length of starting time and repeated starting of a direct online starter?

1099


how to Select Lighting arrester? What r the parameters to be considered for the selection of Lighting arrester ?

741


we need a ntpc previous papers

981