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Electrical Engineering Interview Questions

Batteries used for electrical energy storage are a. Laclanche cells b. Edison cells c. Lead acid cells d.any of the above

851

A circuit breaker on detecting fault will a. Open b. Close c. Open and trigger the alarm

1793

If we have two nodes A and B and Vab is the potential difference between these nodes then which node is called reference node a.node A b.node B c. Ground node

2796

To have variable speeds we use a. Induction motor b. Traction motor c. Shunt motor

1760

ROC converges if poles and zeros lie inside a. Origion b. Z=1

1213

Period of infinite continuous fourier series a. N b. N+M c.infinite

3263

Which protection detects both AC and DC?

3539

how to calculate total load in a villa?

1763

In Single Phase AC Supply,If Voltage between Phase and Neutral is 230V means what will be the Voltage between Phase and Earth?

1793

best manufacturer for busbar for outdoor switchyard having double bus bar scheme, can any one share technical specification of busbar. 132kv voltage ?

872

I just purchased a 4 position cam switch to be used to operate a 3-speed blower motor. The motor is a 10 amp motor and has 3 wires that are used to control speed. The cam switch was rated at 660V 20 amps but when I received it, I noticed that it has AC-15 operational current rating (Ie) of 4/5 amps. If I am reading the label correctly. the 4/5 amps is related to 440v/220V (Ue). Other ratings are AC-3: 5.5A, AC2: 7.5A and AC-4: 1.5A. My questions are 1) Is it safe to use this switch with the motor I have 2) what is the difference between the 20 amp Ith ratting and the Ie operational ratings?

810

We are designer please help me calculate the size of 11kv cables from step up transformer to M.V panel, total load is 5 mega watt distance 900 feet (used aluminum type cables) please provided formula for calculate the cable with example.

839

Please provided formula for calculate the cable size from step up transformer to M.V panel, run overhead aluminum cables, total load is 5mega watt, total length 900 feet.

938

How to calculate the size of earth cable to earth the neutral of UPS ?

968

how many ht 11 kv cable size for 11kv 2000 kva 11kv*433v transformer ?

4481

Un-Answered Questions { Electrical Engineering }

why tertiary winding is used in transformer with diagram?

1368

What is the need of generator relay panel

1107

what is mppt (maximum power point tracking ) and how they used in solar power generation ??? what are the main components used in mppt?????

2292

What are the basic components of the feedback control system?

227

dg earth connect only in the amf panel or not why

1173

234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

1236

what is the difference between unarmoured & Flexible cable? How to identified?

2880

what is the interrelation between voltage current torgue speed and magnetic flux in case of different types of electric motors

1125

2. A current i=(10+10 sin t)amperes is passed through MI type ammeter. its reading will be.........

1343

I PURCHASED A DEISEL GENARATOR SET OF AVR TYPE& RATING 125KVA BUT SOME TIMES THE OUTPUT VOLTAGE IS FLUCTUATING WHAT ARE THE PROBABLE REASONS GIVE ME

998

Explain about 3 phase motor fault current calculation with examples?

2015

The magnitude of sum of two sinusoidal av voltage is equal to 230 volt.the magnitude of each individual voltage is also equal to 230 volt.what must be the phase difference between voltages?

785

what is the control circuit for operating the clean room air shower

1279

What is ramp signal?

247

Differentiate between ideal and non ideal current sources?

227