| Other Electrical Engineering Interview Questions |
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| Question |
Asked @ |
Answers |
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| Can we connect more than one NGR at a time of different
rating of generators. what is advantage or disadvantage. |
| 2 |
| how many power plants in andhra pradesh,how many types and
there capacity |
| 2 |
| why Line voltage =1.732XPhase voltage
what mean by 1.732 |
NCC | 4 |
| can we start a 6.6kv ht motor with 415 lt supply |
| 1 |
| How to the calculating the Reactive power ( kvar ) |
| 3 |
| what is surge voltage and surge current? |
| 2 |
| why lightning arrester and other equipment earthing
conneting from same earth bar ? |
| 1 |
| how to calculate the capacity of the AC motor |
TATA | 1 |
| 60 watts bulb and resistor home heater is connected in
series and 230v is given to the circuit. The heater is
giving some amount of heat. If instant of 60 watts bulb
replace 100 watts bulb what will be the output of the heater? |
NPCIL | 2 |
| 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 |
| Why we use a H.T. Fuse from a thick wire, on other side we use
high rating of cables?
& Why we use less Sq. mm Cable on H.T. side , on other side we use Large Sq. mm cable? |
| 1 |
| HOW BETTER VOLTAGE REGULATION IS OBTAINED BY HIGH VOLTAGE
TRANSMISSION....? |
cummins | 1 |
| |
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