Question { Wipro, 20027 }

Out of 10 white, 9 black and 7 red balls, in how many ways
can we select one or more balls
please with solution.

Answer

10 x 9 x 7 = 630

Question { PPL, 5870 }

I am working on a 11KV system with fault current of 40KA
for 1 second. I have selected 2500MVA 11/0.433KV
transformer.
How can i find the impedance value for this transformer?
Please help me.

Answer

First I do not believe an 11 kv system can have a 40ka
fault. You need to check again.
Second I do not believe you can connect a 2500 mva
transformer to an 11 kv system. Maybe 2500 kva.
%Impedance is on the nameplate of the transformer or ask
the manufacturer.

Question { Engineers India Limited, 5294 }

A 25MVA 3300/400V T/F is termed as per winding is ……
a) primary 3300V & Secondary 400V
b) primary 3300V & low voltage winding 400V
c) High voltage winding 3300V & Secondary 400V
d) High voltage winding 3300V & low voltage winding 400V

Answer

a,b,c and d

Question { 4846 }

A three phase load, around 4 km away from the 11/0.433KV
distribution transformer (Neutral of Transformer is
solidily earthed) and consisting of mainly very costly and
sensitive electronic equipments is giving trouble due to
high voltage difference between neutral and body earth.
Whether this problem can addressed by connecting neutral at
the load point solidly to earth?

Answer

It is an absurdity to try to provide 433 volt electrical
service to a load that is 4 KM away. You need to install 11
kv line to the load and then install the transformer. You
won't have a problem. There is always a difference between
the earth and a neutral. If that is a problem, bond them
together. They should be anyway.

Question { NHPC, 4300 }

if d gen is 50kw,load is 60 kw,hw d gen ll supply d
remaining power?

Answer

It won't

Question { Sabic, 5787 }

How to determine the short circuit current for breakers and
VCB.

Answer

By performing the proper calculations

Question { 2399 }

i have a roll dia aprox.43 inches and gear box ratio is
14.3.so my question is how was decide the kw rating of
motor.

Answer

First you buy a torque wrench. Then with the wrench you
turn the gear box at the speed you want the roll to go.
Then go here
http://www.engineeringtoolbox.com/electrical-motors-torques-
d_651.html

Question { 4999 }

a thing that will break easily?

Answer

Your brain. It may have already happened.

Question { CSE, 3128 }

why impedance test in power cables?

Answer

If you had taken the time to go to Google you would have
found
http://www.omicron.at/fileadmin/user_upload/files/pdf/en/Art
icle-Energia-Impedance-k-factor-Measurement-ENU.pdf

Question { 3588 }

what is V0/V rating of cable

Answer

HB: slow burning on a horizontal specimen; burning rate <
76 mm/min for thickness < 3 mm.
V2 burning stops within 30 seconds on a vertical specimen;
drips of flaming particles are allowed.
V1: burning stops within 30 seconds on a vertical
specimen; drips of particles allowed as long as they are
not inflamed.
V0: burning stops within 10 seconds on a vertical
specimen; drips of particles allowed as long as they are
not inflamed.
5VB: burning stops within 60 seconds on a vertical
specimen; no drips allowed; plaque specimens may develop a
hole.
5VA: burning stops within 60 seconds on a vertical
specimen; no drips allowed; plaque specimens may not
develop

Question { 2626 }

respetsed sir,
i have applied for section engg and juniour engg
for both chennai and tiruvunabthapur boards for electrical
deportments .
can u suggest what books i have to follow and and also from
which sections they r going ask (i mean weightage and what
topics i have to cover) for both se and je for both chennai
and tiruvunanthapur boards.......

Answer

Get a book that teaches you how to properly write a question
using correct spelling.

Question { Adani, 4635 }

what you mean by current?
what you mean by voltage?
what is difference between star and delta connection in
motor side?

Answer

There is a place on the internet called Google.
Find it.

Question { SSC, 4598 }

Where earth point should provided in Ships or Submirines.

Answer

The Hull of the ship or sub.

Question { 5166 }

please can any one tel me where can i get ASO (asistant
stistical officer) meterial

Answer

Karnataka Public Service Commission Exam is held every year
for candidates who wants to get recruited in the Government
and with the craze of this sector reaching an all time
high, the level of exam has therefore become pretty high.
Various books on English have to be consulted as high
stress is given on the subject itself. Further more,
vocabulary enhancing books also play an important role in
the overall preparation.
The candidates should also go through various books that
cover previous years questions. There are many such books
whose primary function is to enhance the confidence level
of the candidates. Apart from them, various books covering
General arts based subject such as History, Geography,
Philosophy, etc also have to be consulted.

Below you will find a list of books which helps a lot in
the preparation of this exam.

G.K. & G.S
Physical Constants
Uniuque Year Book
Rectlinear Kinematics
Indian politics by
Rectilinear Kinematics
Curvilinear Kinematics
Rotational Kinematics
Translational Dynamics
Rotational Dynamics
Work and Energy
Gravitation
Noninertial Mechanics
Special Relativity
Fluid Mechanics
Lakshmikant
Electric Field
Gauss' Law
about below subjects
Electric Potential
Capacity
Direct Current
Magnetic Field
Magnetic Field Laws
Magnetic Interactions
Electromagnetic Induction
Maxwell's Equations
The philosophy of Law: An Exposition of the Fundamental
Principles of Jurisprudence as the Science of Right by
Immanuel Kan
Simple Harmonic Motion
Damped Harmonic Motion
Driven Harmonic Motion
Electric Oscillation
Alternating Current
Wave Motion
Elastic Waves
Electromagnetic Waves
Light Waves
Geometrical Optics
Interference
Polarization
Diffraction
Fraunhofer Diffraction
Dispersion, Absorption, Diffusion
Doppler Effect
Ideal Gas
Molecular Statistics
Transport Phenomena
First Law of Thermodynamics
Second and Third Laws of Thermodynamics
Imperfect Gas
Liquids
Solids
Ancient India by
Thermal Radiation
Quantum Properties of Light
Wave Properties of Particles
Planetary Model of Atom
X-Rays
Particle in Potential Well
Pauli Exclusion Principle
Nuclear Physics
Solid State Physics
D.D.Kausambi’s Historical Outline
English Grammar by
Wren and Martin
R.P.Sharma
N.C.E.R.T. Book [Std. xi & Std. xii]
Beyond Freedom: Talks with Nisargadatta Maharaj

The candidates prime objective should be to go through
these books during preparation and make sure that they
cover all the parts of the syllabus from the concerned
books. These books play a crucial role in ideal preparation
of the exam and help sustain a superior position in the
overall final test. Thus, all of the above said books are
very important from the preparation point of view.



Read more here: http://entrance-exam.net/karnataka-public-
service-commission-exam-books/#ixzz1qwYYpQg3

Question { TCS, 9239 }

What s de answer for this question : Three independent
mechanisms A, B and C have been incorporated for power
saving in a plant producing respectively 30%, 40% and 10%
efficiency. Assuming that they operate independently, what
is the net power efficiency achieved.

(a) 62.2% (b) 68% (c) 61% (d) 64% (e) 56%

Answer

The question says "Assuming that they operate independently"
If they are operating one at a time how can you get your
answer?
Answers 1,2 and 3 are wrong.