sukhvinder


{ City } moga (punjab)
< Country > india
* Profession * jr engineer
User No # 27506
Total Questions Posted # 0
Total Answers Posted # 43

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Users Marked my Answers as Correct # 1607
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Answers / { sukhvinder }

Question { Siemens, 184778 }

what is the difference in MCB, MCCB, RCCB, ELCB, & MPCB
(motor protection circuit bracker)


Answer

mcb : miniature circiut breaker.
mccb : metal clad or moulded case circuit breaker.
rccb : residual current circuit braeker.
elcb : earth leakage circuit breaker.
mpcb : motor protection circuit breaker.

Is This Answer Correct ?    689 Yes 63 No

Question { L&T, 6627 }

what is interlocing and what is the purpose of this?


Answer

adopting interlocking means safety during any type of
operation for example in electrical substations it is must.
in substations operation of isolators, earth switches and
circuit breakers interlocking is provided. when you charge
the line/ict we have to ist open the earth swch then close
isolators and in last circuit breakers to be close. if you
did not open the e/s or not close the isolator cb will not
close due this interlocking.

Is This Answer Correct ?    13 Yes 1 No


Question { Met Trade, 7807 }

how many types of ratings are there of transformer


Answer

ratings of tfr. are
1500MVA,315MVA,250MVA,105MVA,100/75/50MVA,10/12.5MVA etc.

Is This Answer Correct ?    1 Yes 5 No

Question { Essar, 75870 }

What is the Polarisation index value ? (pi value)and
simple definition of polarisation index ?


Answer

it is ratio of insulation resistance (IR)for 10 minutes to
insulation resistance for 1 minute.

it should be 1.5

Is This Answer Correct ?    131 Yes 56 No

Question { 5255 }

which pump is suitable for home use ?


Answer

submersible pump is suitable for home use in case of
drinking.

Is This Answer Correct ?    5 Yes 1 No

Question { 36317 }

In UPS what does 600va reffer to?


Answer

600 VA means capacity or power of ups.

600 VA is equal to 600*0.8 (p.f)= 480W.

Is This Answer Correct ?    58 Yes 14 No

Question { 7832 }

What is the advantage of 3-Phase supply with respect to 1-
Single phase?


Answer

1. 3-ph supply is constant but 1-ph is pulsating.

2. 3-ph induction motors are superior than 1 -ph motors.

3. transmission of 3-ph is economical than 1-ph.

4. voltage regulation of 3-ph is low as compared to 1-ph.

Is This Answer Correct ?    12 Yes 2 No

Question { 14201 }

Why Two Transformers aside shoud be supperated by concreted
wall?


Answer

two transformers are separated by concreted wall becuase of
when any fault occurs which results in fire on any one of
transformer it protects the healthyone transformer.

Is This Answer Correct ?    8 Yes 1 No

Question { 11827 }

what is the difference between potential Transformers and
capacitive voltage transfoemers and where it is used?


Answer

Potential Transformer is designed for monitoring single-
phase and three-phase power line voltages in power metering
applications.

The primary terminals can be connected either in line-to-
line or in line-to-neutral configuration. Fused transformer
models are designated by a suffix of "F" for one fuse
or "FF" for two fuses.

A capacitor voltage transformer (CVT), or capacitance
coupled voltage transformer (CCVT) is a transformer used in
power systems to step down extra high voltage signals and
provide a low voltage signal, for measurement or to operate
a protective relay.

Is This Answer Correct ?    15 Yes 9 No

Question { 13399 }

what is mean by PID & Principal of working


Answer

PID : It is punture insulator detector.

Working : on energised line these PID is moved on insulator
string which measure the voltage gradient against each disc
and from there we can find the punture insulator through
graph.

Is This Answer Correct ?    9 Yes 6 No

Question { L&T, 13870 }

what are the ratings of sockets?


Answer

5 Amp, 15Amp

Is This Answer Correct ?    6 Yes 3 No

Question { 5576 }

what is the difference between neutral and earth????


Answer

Neutral completes the circuit.while in earth the body of
equipment is connented to earth so that during fault the
current can pass to ground saving life of equipment and
humanbeing.

Is This Answer Correct ?    20 Yes 1 No

Question { 2866 }

what is meant by excitation
which supply is used whether ac r dc in the lab
applications


Answer

excitation means energiseing of rotor field by external dc
supply.

in lab almost both dc and ac are used.

Is This Answer Correct ?    9 Yes 1 No

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