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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

why open circuit test is conducted on hv side and short circuit test is conducted on lv side of a transformer ?what is the reason for it ?

HCL, NTPC,

3 42828

why core is useful for a transformer ?and also in its operation ?

1119

why core is useful for the transformer and in its operation

1 2043

1.why should we connect the measuring instruments in l.v side in short circuit test of a transformer? 2.why the power factor is less in open circuit test of a transformer?

1142

why trip circuit supervision is taking through breaker contact? what happen if takendirectly?

GE,

2 2425

why voltage coil in wattmeter called as pressure coil why the pressure term is used in wattmeter?

NPCIL,

1 6321

Why we called L-G fault as line to ground fault why ground? suppose if a line falls on building roof then can we called these fault as line to roof fault? please explain why ground term is used here?

Bhel,

3 3763

If short circuit ratio is high is it bad or good for a machine then tell the reason...

Bhel,

1112

Is phenomenon of resonance is harmfull fr the machine? if not or if yes please explain it?

Bhel,

992

If symmetrical fault occurs at the terminal of a synchronous motor then how the motor will act...explain it..

Bhel,

1137

Why we use modulus with voltage in stability equation that is P=[E][V]SIN@/X WHY VOLTAGE IS IN MODE VALUE WHAT IS THE REASON?

Bhel,

1 1766

EXPLAIN METOD OF IMAGE OF TRANSMISSION LINE/ WHAT ARE ITS PRACTICAL APPLICATION?

Coal India,

979

WHAT IS DEGREE OF COMPOUNDING IN D.C MACHINE MEANS? HOW TO READ THE OPERATING CHART FOR ANY ELECTRICAL MACHINES?

Coal India, Ghana Grid Company,

3093

what do you mean by type zero control sytem ?Give an practical example of type zero contol sytem?

Bhel,

996

Where we can use 3.5c cables instead of 4c cables.Why?

4 10206


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Un-Answered Questions { Electrical Engineering }

plz send me HPCL apptitude paper.. maulik_elect@yahoo.co.in

1182


What is bridge rectifier and explain with details

1030


What is the selection process of breakers. Can any one please give a formulation on same?

1251


describe the fully control circuit diagram of ac drives

913


why on delay timer used for fully automatic star delta starter?

765






what is Anti-pumping?

1005


what happen if field of dc shunt motor opens? what is function of putting res. in parallel to one phase of 3 phase IM? the power supplied by 5A source in circuit is given by------Watt.

1132


What is effect of harmonic current (Draw by VFD) on power system/ electrical Equipments ?

1097


How LT megger works ?

1026


How do we calculate over and under frequency tolerance from generator data?

437


any application of back emf

1144


explain PV modules in solar energy generation.

958


What is process of anneling transformer core

920


what is the differation bewreen kwh & fundamental kwh in electronic trivector meters

1181


What is difference between start imitation and start interlock for 3 phase motor protection ?

1332