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Electrical Engineering Interview Questions

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What happens when generator is running with leading power factor on it say -0.96. what are the effects of it on alternator and the other generators operating in parallel to it.

I want to give Power supply to a house from the Feeder, Total Load of the House is 128 KW, how to calculate cable size for this load ?

for same rating of a transformer and induction motor which one will have higher magnetising current flowing?

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Un-Answered Questions { Electrical Engineering }

What is the difference between rulling span and wind span of of an Over Head Transmission Line?

My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I - is the value of AC fault current. t - is the operating time of disconnecting device in seconds. K – is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

what is the min and max ohmic resistance for the earthing rod installed for lighting poles for street light network

How can get elongation of 2 k.G aluminium, if elongated aluminium dia is 2.5 mm?

how generator load test is conducted?what are the steps?

how to meas-our losses for L.T & H.T

How do we calculate the maximum amount of current in a 300 SQ.MM cable ?

How many devices can be connected in one zone of FACP

Single line diagrams for star to delta and DOL starters.

The slip during plugging operation is given by= A 1-s B 2+s C 1+s D 2-s

How to know the following data of synchronous generator 1. D-Axis Unsaturated Reactance 2. D-Axis Unsaturated Transient Reactance 3. D-Axis Unsaturated Sub - Transient Reactance

How much inductance or resistance require as a starter in series with induction motor of specific capacity(e.g. 5 hp) ? What is formula for it ?

what is the current density of copper & alluminium.

What is the universal motor?

explain the process of commutation in a dc machine. Explain what are inter-poles and why they are required in a dc machine.