Interview Questions Answers in Electrical Engineering

Question { Gujarat Alkalies and Chemicals GACL, 9964 }

What is the basic difference between AVR and stabilizer?

Answer

AVR means automatic volatage regulator these are used in
alternators and dg sets.
stabilizer is maintain contant output voltage if various
inputs

Is This Answer Correct ?

8 Yes

0 No

Question { 4831 }

I am getting diesel genset 62 kv for my house
In addition there are 6 meters of 11kv for the house
Lift also being installed for house plot sise 200sq yds
total 4 + 2 foloors
I want to know how much earthing required how deep it should be

Answer

required for dg set earth pits are 2 no,s of dg body, 2 no,s
of dg nutaral.
6 meters required to 6 earth pits and lift also required to
2 no's body earthing

Is This Answer Correct ?

1 Yes

0 No

Question { IAF, 7022 }

how to identyfy cable sizes?

Answer

cable sizing is copper core cable 1sqmm = 3-6amps times taken
aluminum core cable 1sqmm = 1.5-3amps times taken

Is This Answer Correct ?

3 Yes

0 No

Question { 5457 }

How can we calculate the Rating of DG Set for a 4 kw motor?

Answer

kw 4
hp 5.434782609
amps 7
DG selection is grater 3to 4 times

Is This Answer Correct ?

0 Yes

0 No

Question { Adani, 7827 }

Differcence between UPS and Inverter.

Answer

UPS means un interped power supply. inverter is dc current
to ac current

Is This Answer Correct ?

1 Yes

0 No

Question { Welspun, 6613 }

What is power transformer?

Answer

power transformer is stepup/stepdwon voltage levels
eighther generating stations , substations

Is This Answer Correct ?

4 Yes

0 No

Question { 5738 }

1. what is exciting winding, rotor winding, startor
winding. and how it works? in ac generator

Answer

exiciting winding/rotor winding is same to produce the uni
form flux, stator winding is to collcect current

Is This Answer Correct ?

3 Yes

0 No

Question { 4306 }

Is there any scope for an electrical engineer in MRF
company......

Answer

yes,

Is This Answer Correct ?

2 Yes

0 No

Question { 5026 }

xlpe cable 4 core nuetral wire is small why ?

Answer

Neutral wire nothing but return path wire, maximum current
carry phases

Is This Answer Correct ?

0 Yes

0 No

Question { 4139 }

I am having 120KVA UPS,which is connected to DG & normal
power. What is the power drawn by this system when system
is running on DG ????

Answer

power drawn to the system 167.5 amps

Is This Answer Correct ?

1 Yes

2 No

Question { 4962 }

what is stepping motor and where can use in electrical
installation.

Answer

It is one type of motor that can rotates steps by steps
motors use electrical clocks computers

Is This Answer Correct ?

0 Yes

0 No

Question { 4456 }

i have 6oo kva dry type transformer and its neutral is not
grounded even body of transformer ground i want to know it is
safe or not ?

Answer

If any kind of Transformers dry type or oil type.
Neutral and Body compulsory grounded otherwise
Neutral ungrounded Harmonic's entered in o the system.
Body not grounded if any short circuits internal external
shock attack human body.

Is This Answer Correct ?

6 Yes

0 No

Question { Quest, 6106 }

WHY CAPACITOR IS NOT USED FOR THREE PHASE MOTORS DURING
STARTING

Answer

Three phase supply produce rotating magnetic field so three
motors are self starting so not required capacitors in three
phase motors.

Is This Answer Correct ?

14 Yes

2 No

Question { 8654 }

What is the difference between a Distribution Transformer
and a Power Transformer.

Answer

Distribution transformer is a step down transformer located
in towns, villages
Power transformer is a step up transformer located in
generating station only.

Is This Answer Correct ?

11 Yes

5 No

venkat