Electrical Engineering Interview Questions

Can we use both Electrical & mechanical interlock between tow breakers? if yes how, please explain

141

Can Anyone suggest the Standards (IEC or IS) for selecting copper current density?

144

our plant maximum demand has 500 kva.need to suggest me to maintained pf 0.98.how much capacitor bank will be connect to the supply line.

265

How to calculate or formula to calculate rhe power in 2 phase system ??

176

The knee point of a current transformer is normally unique and known.So why in the nameplate of a CT they put the minimum value like this Vk> 400v.

128

What is the function of the generator exciter?

136

193

Railway Basic electrical engg technical question with answer

267

What is the minimum distance to be maintained in between HT panel and LT panel and Instrument panel as per IEC and NEC standards?

187

Can we use 230VAC, 63A MCB for 120VAC, 63A supplied heaters load?

178

Application of statically induced emf

414

Why we make earth connection with Transformer Body and What will be the minimum size of copper wire as per code with respect to KVA rating of Transformer?

198

What is formula of capacitor for 1-phase power connection.how to improve PF. Suppose I want to connect capacitor in refrigerator to reduce power consumptions.

180

What are the no-load losses for the 11000/415V transformer with the following rated capacity? 1.1500 kVA 2. 2000 kVA 3. 2500 kVA 4. 3000 kVA

184

when ID fan will immediately stop through VFD what exactly cause and problem the ID fan

147

Un-Answered Questions { Electrical Engineering }

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

448

A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.

424

why impudance relay used for medium transmission power system? why not others?

72

what is the voltage regulation for unity and zero power factor?

976

An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor reactance at stand still is A 2 ohm B 1.25 ohm C 3.15 ohm D 2.25 ohm

981

What is the meaning of 40X8X2 busbar dimensions for carring load of 400 Amps

742

Generation of voltage for each phase are same of a turbogenerator.Although the short circuit current flow when two phase of turbogenerator are shorted(where current can't flow without potential difference),why?

814

I have a reading off 1.5ohms at my mem my main c/b is rated at 40/6 amps in a domestic house and i was told to change it to a b curve c/b is this ok

412

given data are load current & power factor cable core size? plz any one update the calculation formula

619

what purpose to use excaiter in DG.?

1354

What is the rotor frequency of 10 Hp 1440 RPM 50HZ 415V ?

674

how to check regenerative load in drived motor

944

Can I use star delta connected induction motor for dual supply voltage?

755

What kind of Neutral CT can be placed in 11/0.433KV transformer to be used and what are its specification?

420

How much should be the load percentage for 15kva Inverter and Iinut & I output load with Calculations

745