Electrical Engineering Interview Questions
Questions Answers Views Company eMail

when a cunductor is being disconnected from live cct, still it showing charged, if its checked by line tester?

GEB,

8 4429

WHY CFL can't made in shape of bulb.

5 5527

why three phase system is not preferred in aircrafts power cckts if yes than explain reasons?

3 3174




wat is the role of reactive power in power generation?why we have maintain it.

3 7213

wat is the importance of reactive power in power generation.....if it is zero means wat will happen to system........

Bhel, Jindal,

22 28012

what is difference between differential protection and distance protection and how we calculate the sloop?

OPS, Power Grid,

5 33059

what is slip resistance? how much its value in 110 kw motor? why voltage is varied in vvvf drive ?

Reliance,

1 2664

What type of protective system we uses in L.V. distribution panels?

6 4909




Why P.f. of the system decreases when it is connectect across induction motor? & how to maintain the p.f. of system to unity.?

Reliance,

6 5668

What do you mean by S.F.U. unit? application of it.

Indo Asian,

16 81686

what is green house effect?

4 3175

what do u mean by knee point voltage?

TATA,

7 10688

what is negative,positive abd zero sequence current explain clearly

Jindal,

1 6525

what happens when ac supply is given to D.C motor.

17 21153

what is purpose of using reactor in substations.

Heavy Engineering Corporation Ltd HECL,

20 89907


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Un-Answered Questions { Electrical Engineering }

what is difference between line differential and transformer differential?

441


what are safety measures in /control in diesal engine/ explain them?

604


A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram

1172


i am completed in B.E(Electrical and Electronics Engineering) with 8 months experience in Quality Control Engineer at Bharathi Industries,Coimbatore.

671


how to select proper cable for ct wiring so that drop within the limit.

687






Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

606


We are preparing another project which involves Waste heat recovery from a 1 MW GE Engine. The Engine in particular gives out flue gas at 487Deg C with a flow rate of 5650 kg/hour and this can be cooled to 180 Deg C. This gives a thermal output of ~ 594 KW that is available for input to VAM via heat exchanger / boiler. Additionally 581 KW will be available from engine jacket water (temperature profile 80/ 80 Deg C and a flow rate of 50m3/hr) Our estimation is that 300 TR of cooling is possible with a suitable VAM machine(s). Please advise what is the most suitable arrangement with maximum TR and min Capital expenditure. plz reply me as early as possible

689


What are the special cables required for explosion proof wiring?

1397


dc supply given to dc generator winding.how is possible? my knowledge is saying the winding will burn. please reply.

159


HOW TO CALCULATE HV TEST VOLTAGE FOR ELECTRICAL EQPT.

848


how to handle 2500 kva transformar

360


i am trying to PSUs/govermeant jobs since last 2 years but still i m not success, plz help me.

725


by using pump duty, how we will can calculate the motor duty(KW)? is there any standard or formula.

741


What is the de rating factor of cable? What is the importance of the de rating factor in cable select

1039


how to carried out tan delta test in 11 KV alternator ?

1652