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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

how point on wave controller works.

1581

Up to how much limit of HP of electric motor the Star- Delta Starter can be used ?

1 2387

How will calculate losses in an multi core Aluminium LT cable of different sizes & upto what length we can use a LT Cable ?

1242

what is meaning of AMF, WHY IS USING IN GENSET

1 2631

when ELCB breaks the circuit than INVERTER auto-connect the circuit to the battery than how can the operetor is safe??

1 4513

actual rated capacity of a disc insulator??

OPTCL,

5 6244

What is meaning of DRU in gen.of AVR.

2 2452

which motor used in electric train ans how much volt.

Trimax,

4 3679

what is the change over switch ,switch disconnector ,bypass switch and switch disconnector fuse unit?

1 7153

In case of 3 phase motor why it is called single phasing by failure of one phare unless there is rest two phase are acting. ?

3 3221

who is ohm's and his law ?

1 2250

how much earthings are mendatory at a 25kva sub station?

Bhel,

3 4380

why grid failure happens?

1 2400

what is deffrent alternatid and gernater

2 2925

why transformer rating in kva

6 4382


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Un-Answered Questions { Electrical Engineering }

write circuit diagram for a motor rotate in forward direction once it started and when pressed the same button it should rotate in anticlockwise.

1627


1- XC and the RC time constant are both measures of the reaction of C to a change in ____? 2-The power factor is a numerical ratio with a value between 0 and 1 equal to the ______________ of the phase angle. 3-When V and I are out of phase because of reactance, the product of V times I is called ______________ power 4-For _____________ inductors, the branch currents can be added algebraically. 5- The ______________ power in watts can be calculated as I^2R 6-Calculate XL with L = 30mH and f = 1kHz ( I have Xl=2piFL 2*3.141592653*1kHz*30mH =188 ohms Please check) 7-A parallel RL circuit has the values, R = 5kohms, XL = 5kohms. A voltage source of Vt = 10Vrms is connected in parallel to R and L. Determine the total current, It delivered by the voltage source Vt. 8-A series RC circuit has R = 1Mohm and C = 1microF. How long would it take for the capacitor to fully discharge if it is initially fully charged? 9-A circuit has real power = 300W and an apparent power of 500VA. Determine the power factor and phase angle. 10-The time constant for an LR series circuit is T = 0.1s and R = 10ohms. Calculate the inductance L.

2332


If a transformer primary winding operates at 240v, the secondary at 120v and the load is 1500w & the transformer is rated at 92% efficient, what's the current flowing through the primary winding of the transformer? What is the formula for finding this?

1226


Assuming that a dedicated neutral earthing transformer is provided for each GT generator, when the two generators are running in parallel, has consideration been given that the earth fault current from one generator stator winding be split between the two neutral earthing transformers? If so, what adverse impact will this have on the operation of the 59N and 27TN devices?

799


HOW TO WORK A VFD?SAY SIMPLE METHOD

2908






i have done diploma and btech in EE and live in Chandigarh so kindly help me how can i make my competency certificate in my area.

1344


How PSV sizing being done

1295


In three pin plug 6 amp. 220V ac rating. Why earth pin diameter is higher than other two pin? What its purpose ?

194


what is the main difference between power devices and signal devices

1273


how we calculate the short circuit capacity of the busbar in LV & HT?

210


why on axial hitting up of air blast on hydrogen produced in oil circuit breaker,temperature rises of the core of the arc?

972


how are reversing the direction of rotation of dc motor

807


what is cascade speed control device?and how this device control the speed of motors?

1095


why occ characteristics of generator is also called as magnatization characteristics ?

1003


What is the effect on Power factor and capacitor when your company load is more than 70 % of welding transformer

885