
Paper Type :
Technical 
Electronics
Test Date : 28
October 2007
Test Location :
Delhi
NALCO papers on 28th
oct. 2007 at DELHI
Hi friends,
Here are the some of
the technical
questions posed in
the NALCO exam for
the post of Graduate
engineering trainee
on 28 oct. 2007 for
Electrical branch.
Out of 120 questions
60 technical
questions, 60
nontech questions
and time duration
was 2 and half
hours.
1) rms value of AC
current is equal to
main current at an
angle ?
a) 60 b) 45 c) 30 d)
90
2) Corona produce in
two transmission
line if ?
a) Whn both placed
closed b) Whn both
placed widely
c) Potential
difference is very
high d) I did’t
remembered
3) Diac is equall to
?
a) Two diode and two
resister b) Trice
with two gate
c) Two thyristor
connect in
antiparallel d)Four
layer pnpn scr
4) In the Economic
transmission point
of view Kelvin,s
gives ?
A) Voltage drop at
feeder b)
transmission losses
Two more option I
did’t remember.
5) The essential
condition for using
servomotor for high
torque at all?
a) load b) speed
c) voltage d) power
6) If torque of
induction motor is
200nm at slip 12%.
Wht is the value of
torque at slip
6%.....?
a) 60nm b) 40
c) 100 nm d) 150
7) If speed of
induction motor at
full load is 950rpm
then wht is the
speed at half load ?
a) 1000 rpm b) 975
Two option I
forget……
8) Find the value of
?¦cost +1/2¦dt where
limit is 0 to ?/2?
Option I did’t
remerm
9) Wht is the slope
of –x3+ 6x2+ 2x+1=0?
Option I did’t
remerm
10) For the purpose
of constant speed we
use?
a) Brushless dc
motor b) stepper
motor
c) shaded pole motor
d) sync motor
11) Essential
condition for
parallel operation
of 1phase
transformer?
a) Rating b)
Polarity
c) Impedance d)
Voltage
12) Some of G.K.
question
About placed of
shriharikota space
center.
13) Who did give the
name of AL?
14) World literacy
day?
15) World
environment day?
16) If two heaters
of 100W & 110 volt
other are 150W & 110
volt connect in
series with 220v ac
source then what is
the total power?
17) What is the GDP
rate of India in
200506?
18) What is the %
rate of production
of AL in India?
a) 10 b) 20
c) 7 d) 14
19) One passes which
have 4Qs
20) Some fill in
blanks
21) One Q about the
find the % of fifth
harmonics in a
current wave
equation.
22) 4pole 3phase 50 htz induction motor running at 1460 rpm. Wht is the
speed of running
slip wrt to rotor?
23) Find the new kva
rating of
transformer which
hav 220 kva, 1watt
iron loss and 2watt
cu loss?
24) Hay’s bridge
used for the
measurement of?
25) In RLC
parallel resonant
circuit
a) Impedance is max.
b) resistance is min
two more options I
did’t remember
26) Two bulb 100w &
50w respectively
with constant
resistances connect
in series with 220v
dc source then wht
is the value of
voltage across first
bulb?
27) AC ammeter used
for measurement in
a) Pmmc b) induction
meter
c) Dynamometer d)
moving iron type
meter
28) For ac current
we use?
Same option
29) we preferred VV
connection over TT
connection why?
30) Suspension type
insulator is used
whn?
a) high voltage b)
low voltage
c) oscillating
voltage d) steady
voltage
31) One question
based on Norton’s
theorem?
32) One question
based on invertedV
curve of synch
motor.
33) one question
based on load
saturation curve.
34) There were 4
question like if A*B
represent A is the
son of B, some like
that
35) Some questions
from BARGRAPHS
36) Some questions
from probability.
37) Some questions
from
Data–interpretation
38) Some questions
from diodes.
39) One question
from winding design
for motor (find
value of commutator
segment)
There were still
more question but I
couldn’t remember
all of them.
BUY CHANDRAMOHAN....... 