Electrical Engineering Interview Questions
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Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

1 2726

in a live circuit with a light bulb such that the bulb is off by a switch, is the light glows if the switch 2 terminals are both touched by a mouse?

1 2867

why power of fm is weaker than am?

1 2715

how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?

1394

in an electronic tri vector meter when the current and voltage sequence changes ? what is the effect of phase sequence on recording of meter

L&T,

1690

what is the difference between 3 phase 3wire &3phase 4 wire meter?what is the advantage of 3p3w over 3p4w?

L&T, MahaDiscom,

1 16854

how to calculate the fault in substation

1706

wow to calculate the transformer rating(KVA)

1668

in 33kv line how much current will be

3 26558

what is the condition for YnD11

Bhel,

2070

how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating

1905

what is sevice settings for mccb?How can be it setted?

1573

why sielent pole is used only in hydro generators and not in turbo generators

1 3346

any idea abt REVERSE METERING concept.........?

1729

2 v/500amp/hr to 1.80vpc at 20 degree celsious 2v/5ooamp/hr to 1.75 vpc at 77degree farren .this is the capacity of a battery .what is the meaning of this . can i get a detailed explenation

1858


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Un-Answered Questions { Electrical Engineering }

what is the advantage of connecting capacitors in delta than in star?

1624


how you will decide the distance between the power transformer and its fencing

1449


what is the relation between knowing of the distance between power transformer and the capacitor feeder in case of parallel operation

1451


explain all the classes with example

1487


The Howland current source produces a A Unidirectional floating load current B Bidirectional single-ended load current C Unidirectional single-ended load current D Bidirectional floating load current

1639






working function importance of mdc meter

1686


In DC generator, we use commutator, having no. of segments. Then how it is possible to get a half wave of voltage and current for half rotation of armature?

1471


why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?

2460


hi if anybody got model questions for cpcl Grade'A' electrical engineer position.send it to my mail please krishkumar22@gmail.com

1472


I need to connect a synchronous generator to the grid using automatic synchronization and two circuit breakers (one for synchronization, one for end connection to the grid), how to determinate the required diameter of the cables?

2039


where is core-type and shell-type construction suitable for transformers ?

1637


1 Ton is equal to how many watts?

662


what is KA rating and how can we choose switchgears on applications

958


What is the difference between single core 2 wire and single core 3 wire system? Which application we are using this? and for What purpose we are using this?

1844


how current is reverse from its normal direction during the fault?

1987