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Electrical Engineering Interview Questions

i am going to attaned the engineer (disign)iterview at HAL please give me duid line

HAL,

1253

why shunt capacitor is connected

2311

what is the mho relay

5374

1. what is the power factor of a purely inductive load? 2. Which type of transformer connection is preferred in case of power supply transformers? 3. In power transformer usually which winding is closer to the core? 4. what will happen to the generated emf if the no. of poles of an alternator is increased?

3239

1. what is the power factor of a purely inductive load? (i) Zero (ii) Lagging (iii)Leading (iv) Unity 2. which type of transformer connection is preferred in case of power supply transformer? (i) Star/Star (ii) Delta/Delta (iii) Star/Delta (iv) Zig Zag/Star

3362

what is the power factor of an inductive load ? (i) Zero (ii) Lagging (iii) Leading (iv) Unity

5014

what is difference between multimeter and transmitter

2198

what is suroounding current of dg set?

3087

What is the out put of a CT? How the ratio is decided ?

3177

what is the string efficiency

3732

Can we parallel lise the secondary side of the two similiar transformers with same voltage ration, imp, but with different vector groups.. ( for ex. 11 KV / 6.6KV two trfs but different vector groups can we parallelise both of them ,, what happens if we parallelise them

2281

how much current a 100 sq mm busbar will carry?

ABB,

3340

difference between brush less & brush excitation in a generator?

3245

what are the usual topology of transformers at different substations in the power system and why that particular topology is choosen. what are the limitaions of that topology?

1146

if a damaged 500kva transformer with %impedance 2.6 is replaced by two transformers of 250Kva with different % impedance will they be able to catter the load. what will be the ratio of load on the two transformers if the % impedance is in the ratio 1:2

2746

Un-Answered Questions { Electrical Engineering }

acb(AIR CIRCUIT BREAKER)NOT CHARGING AUTO

1231

Please clarify, 1. Is it required to lay two runs of GI wire along with Armoured LT cable if it is laid between one big mains (63Amps TPN SDF) to small main (32A TPN SDF) with proper glanding termination? 2. If the armoured cable with proper glanding is laid from DB to CNC machine, is it required to run two runs of body earthing to the Machine from DB? 3.If the armoured cable with proper glanding is laid from Substation to Hangar, distance is approx. 100 mtrs, is it required to do earthing at shop area though the primary termination at substation is earthed through gland.

1118

What is the test block protection relay if any body know plz explained

546

what is the criteria for selecting fuse rating in 1phase, 2phase & 3phase welding sets?

925

1139

if the load is 80 amp for main fuse and 100 amp for breaker so how can we calculate the cable size (cooper ) .

1197

in star-delta tranformer,if the input of star connection is 400/7v 3 kva then what is the output of delta connection?

1175

Define thermal resistance in the context of power amplifier.

157

slipring induction motor starting time Lrs operating why lrs starting time lrs outer body didn't get shock

1005

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

1081

How PADO software increase the efficiency of power plant?

5180

Why lose 1 phase voltage in 33kv to 415v stepdown transformer

801

A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?

2868

which book to refer in electrical engineering for iocl exam & which book for general english.

1290

how can i get the formula to find out the cable size if i know the load of main fuse protection.

977