NATIONAL ALUMINIUM COMPANY Whole-Testpaper Contributed by Shanthi updated on Apr 2019

                                                        Nalco GK Paper


Hai,This is Shanthi, I have appeared for the NALCO exam on 26th Sept 2010. I am from Electrical stream. The Paper consists of 2 parts. The duration is 2 and half an hours.

1st part:60 questions from Non-Technical(GK, Passage Reading, Synonyms, English)

2nd part: 60 questions from Technical


GK questions:

1.Among the following cities, which one is at the highest altitude above mean sea level?

(a) Bangalore
(b) Delhi
(c) Jodhapur
(d) Nagpur


2. Who is the winner of "Rajiv Khel Ratna Award" in 2010?

3. Currency Of China?

4. How many deemed universities are de-recognised by the governatment in 2010?


Still some questions are there i didn't remember those.


Technical questions: Some of the questions i remembered are


1. An ammeter is _________instrument

a) An indicating

b) An integrating

c) A recording

d) None of the above


2. The pointer of an indicating instrument is generally made of __________

a) Copper

b) Aluminium

c) Silver

d) Soft steel.


3. A transformer is an effeicient device because

a) Is a static device

b) Uses inductive coupling

c) Uses capactive coupling

d) Uses electric coupling


4. A transformer does not posses_________property

a) Impedance

b) Voltage

c) Current

d) Power


5. The synchronous speed of a 3-phase induction motor having 20poles and connected to a 50hz sorce is________

a) 600 r.p.m

b) 1000 r.p.m

c) 1200 r.p.m

d) 300 r.p.m


6. Most of sigle-phase induction motors are________machines

a) 2-pole

b) 6-pole

c) 8-pole

d) 4-pole


7. For the same rating.the size of a single-phase induction motor is about__________that of corresponding 3-phase nduction motor

a) 3 times

b) The same as

c) 1.5 times

d) 0.33 times


8. Turbo-alternators have rotors of________

a) Small diameter and long axial length

b) Large diameter and long axial length

c) Large diameter and smallaxial length

d) Same diameter and axial length


9. Damper winding in a synchronous motor________

a) Reduces windage losse

b) Serves to start the motor

c) Improves pf of the motor

d) Increases hunting of the motor.


10. The full-load slip of a syncronous motor is_______

a) 5%

b) 1%

c) 2%

d) 0


11. As a matter of economy.Voltage for power transmission should be

a) Low

b) Medium

c) High

d) None of the above


12.The term service mains refer to

a) Primary transmission

b) Secondary transmission

c) Primary distribution

d) Secondary distribution


13. Sag is provided in overhead lines so tht

a) Safe tension is not exceeded

b) Repair can be made

c) Conductor material is saved

d) None of above


14. A 3 wire dc distribution system makes available

a) One voltage

b) Two voltages

c) Three voltages

d) None of above


15.The distribution transformer is generally connected in

a) Delta/star

b) Delta/Delta

c) Star/Star

d) Star/Delta.


16.The most severe fault on the power system is

a) Three-phase short circuit

b) Line ti line fault

c) Double line to ground fault

d) Single line to ground fault


All questions are from."Objective electrical technology" bye V.K Mehta, Rohit Mehta.


But we can't expect that they give the questions from above book that i mentioned next time. So please refer other books also.