Placement Papers: NALCO Paper 2007
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NALCO Paper Delhi 2007
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.

rms value of AC current is equal to main current at an angle?

60

45

30

90


Corona produce in two transmission line if?

When both placed closed

When both placed widely

Potential difference is very high

I didn't remembered


Diac is equal to?

Two diodes and two resisters

Trice with two gates

Two thyristor connect in antiparallel

four layer pnpn scr


In the Economic transmission point of view Kelvin's gives?

Voltage drop at feeder

transmission losses
Two more option I didn't remember.


The essential condition for using servomotor for high torque at all?

Load

speed

Voltage

power


If torque of induction motor is 200nm at slip 12%. What is the value of torque at slip 6%____

60nm

40

100 nm

150


If speed of induction motor at full load is 950rpm then what is the speed at half load?

1000 rpm

975
Two options I forget


Find the value of? cost + ½ dt where limit is 0 to?/2 Option I didn't remember.

What is the slope of “x3 + 6 × 2 + 2x + 1 = 0”

For the purpose of constant speed we use?

Brushless dc motor

stepper motor

Shaded pole motor

sync motor


Essential condition for parallel operation of 1phase transformer?

Rating

Polarity

Impedance

Voltage


Some of GK question About placed of shriharikota space center.

Who did give the name of AL?

World literacy day?

World environment day?

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?

What is the GDP rate of India in 2005 − 06?

What is the % rate of production of Al in India?

10

20

7

14


One passes which have 4Qs

Some fill in blanks

One Q about the find the % of fifth harmonics in a current wave equation.

4pole 3phase 50 htz induction motor running at 1460 rpm. What is the speed of running slip wrt to rotor?

Find the new kva rating of transformer which has 220 kva, 1watt iron loss and 2watt cu loss?

Hay's bridge used for the measurement of?

In RLC parallel resonant circuit

Impedance is max.

Resistance is min
Two more options I didn't remember.


Two bulb 100w & 50w respectively with constant resistances connect in series with 220v dc source then what is the value of voltage across first bulb?

AC ammeter used for measurement in

Pmmc

induction meter

Dynamometer

moving iron type meter


For ac current we use? Same option

We preferred VV connection over TT connection why?

Suspension type insulator is used when?

High voltage

low voltage

Oscillating voltage

steady voltage


One question based on Norton's theorem?

One question based on invertedV curve of synch motor.

One question based on load saturation curve.

There were 4 question like if A * B represent A is the son of B, some like that

Some questions from BARGRAPHS

Some questions from probability.

Some questions from Data interpretation

Some questions from diodes.

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. The questions mostly have taken from electrical handbook, gate papers. Almost all questions were come simple basics.
CHANDRAMOHAN