Electrical Engineering Interview Questions

Difference between online and offline UPS?

19064

How to calculate earth flat size for 250 Kva DG and transformer?

24074

can we use HPSV LAMP in HPMV LAMP fixture ?and viseversa.

OPS,

8993

Why motor initial starting current is high?

47398

megger generates D.C. voltage while earth tester generates A.C.voltage is it true? I know for megger it is D.C generator but what about earth tester?

IOCL,

17346

What is the cause for a blown fuse in one phase of primery side(HV) of a three phase transformer( 4169v-460v) in the time of closing its supply breaker. There is no load on the secondery side of the transformer in this moment.

7465

iam using DM 3251 voltmeter(1 percent accuracy)for 11KV system PT ratio is 11KV/110V.can anybody explain what is the max and min voltage deviation.

842

What is mean by Sub Synchronous Resonance(SSR)???

2453

Will sag depends on the Specific Resistance of the conductor?if not Why??????????

BARC,

2481

how to calculate the neautral earthing conductor size for a 500kva dg set.

6322

What are the implications when the power factor is is leading condition ?

1407

What is double delta conection in AC Motor? And can we done the double RPM of the motor by double delta conection?

5555

How to control speed of DC motor with AC power?

8193

why transformer is giving some humming noise .....?

19069

when the rheostat kept in minimum to maximum position in motors what will happen?

10999

Un-Answered Questions { Electrical Engineering }

in a solar power plant,we are going to step up the voltage 350V to 33kv, and to 132kv GSS. i want to ask that if it is possible that 315v/33kv is not possible because we also use 315v/11kv. or it should be 415v/33kv? is it effects generation or losses?  the second question is-generation is depends on LV winding? or LV winding design for generation voltage?

476

What is the operating principle of turbo-generator.

868

neutral earth resistance testing is it possible for transformer while in load condition

635

can i use 2000/5A Clamp meter to measure HT cable

804

What is state space method ? Why its used ? Can it applicable on linear, non-linear, 1st order, higher order, homogeneous, non-homogeneous, open-loop , closed loops , stable & unstable systems ?

833

Why we use Electrical energy rather than any other type of energy, mostly? Explain behavior of open secondary CT and short circuited secondary PT in energized condition?

649

i have been tasked with a design of protection, metering and control(PMC) relay panel extension to accommodate all PMC relays.There is an already existing panel where this one will be built.What are the design aspects for this kind of project? thank you.

802

In my power station 220 volts dc battery set. they coneected 84th cell taped

439

where can the transformer having vector group Yny0 be used??

2243

As per standard, transformer body earthing and other Equipment earthing (Equipment earthing) did not connect. but in LT side termination we are doing metal glanding in both side Transformer to PCC Panel through armoured cable, now X'mer body earthing and PCC Pane earthing (Equipment earthing) both are connect.is this safe for X'mer or other equipment?

398

what is thermal resistance of PVC Cable.

480

How to setting the volume of RTCC panel AVR (11kv) controller

417

why you don not show protection and type of isolation in key single line diagram?

693

What happened when voltage will half value of current ...

308

explain all the classes with example

668