Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Why induction motor can not be operated at synchronous speed?? what would happen if it is operated at synchronous speed??

5 23983

can we coorect P.F. OF 320 KVA ALTERNATOR AT LOCAL SITE WITH RATED .8 PF LAGGING.

1 2675

sir, i want to know the calculation for find rated current for cable sizes.(both copper & aluminium) with examole. please sir for example: 35sq.mm al.cable is withstands for how many amps? is suitable for 45kw motor?

L&T,

5 10745

what can be the causes of capacitor start motor having a higher current that its actual

1483

How to calculate per unit impedance of transformer?

1543

Why the output of generator varies eventhough the shaft speed is constant in thermal power plant?

5 5596

what is meant by phase transformation ratio in induction motors?

2 13913

why generator one end side star neutral point given? if this point not given what happen?

1 3346

what happen if turbine trip ,g.c.b not open and excitation on condition?

1 4179

what happen if steam turbine trip,g.c.b not open and excitation off and on condition?

1 3528

why capacitor is not discharged phase to body

1 2802

Why the electron flow in reverse of current.

6 7501

What is the function of an Auto reclosure relay. How does it work??

KSEB,

4 16510

What is EHT tariff or Power factor Tariff ????

KSEB,

1879

how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?

SISL,

1509


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Un-Answered Questions { Electrical Engineering }

what is zinc diffusion?

1519


how to select the mpcbs and contactor for 3 phase 30 hp star delta motors.for plc control.and tell me the calaculation for future use.

1444


Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example?

1618


What will be the voltage impact on secondary side of two transformers with different vector groups when both voltages are compared.

1490


From what on-site components does the HT panel monitoring the bus-bars in a 11kV system take inputs?

1500






What is the practical way to calculate the cable size for known ampere load?

905


What is the diff. between single compression and double compression gland

1495


A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.

673


how will calculate the safe starting current of 3-phase squirrel cage induction motor?

1421


Dear sir, I have completed DECE in the year 1995. I have work experience in HT and LT LINE more than five years. Now i am doing BE in EEE from rajasthan university. After completion of BE,can i apply "C" Licence sir? Please reply.

1466


can i use 4 number of circuit breaker as single phase manual change over switch? if yes then how plz also send ckt diagram at nazimzamurad@gmail.com

1590


How much load can be taken for chiller from 1500 kva transformer

842


why the difference arise between HT reading & LT reading (submeters fixed in complexes, apartments etc)if the power factos exceed from 0.9 to 1 can the ht meter reads fast?

2158


what is the difference between general inverter and solor inverter clerly explain plz

1639


What do you mean by a current transformer?

621