ABB - Asea Brown Boveri
Operating mainly in the power and automation technology areas.
ABB is one of the largest engineering companies in the world

PATTERN OF RECRUITMENT:
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1. Written Test(Aptitude + Technical).
2. Personal Interview. (Tech + HR)

Pattern for campus placement
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1. Written Test in campus(Aptitude + Technical).
2. Personal Interview in ABB location

Personal Interview
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Both Technical and HR combination
HR mainly deals with your extra carricular activities.


Technical Topics
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Electrical Machines
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Motors
DC Motors-Series,Shunt,Compound Motors
Induction Motors
Servomotors-AC,DC
Generators
DC Generators
Alternators
Transformers

Control Systems
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Control System Plots
Bode Plot
Nichols Plot
Nyquists Plot
Concepts of stability
Concepts of root-locus
Conccepts of frequency response

Programmable Logic Control
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Programmable Logic Devices

Digital Electronics
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Basic gates
Adder,Subtractor circuits implimentation using NAND,NOR..
Combinational Logic Circuits
MUX,DEMUX
Flip-Flops-JK,D,T,RS..
Flip-Flop Conversion
Number systems

TECHNICAL PAPER
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1.In a ckt. We are giving voltage of 50 Hz as well as 60.What will be the resultant frequency.
(a)less than 50
(b) more than 60
(c) between 50 & 60
(d) none

2.In a ckt a single resistor is connected across a d.c. source, what will be the effect on current in first resistor if we connect one more resistance in parallel?

3.Why we don't like flashover in transmission line (t-line)-
(a) It may create earth fault
(b) It reduces the life of insulator

4.Total no of strands in a acsr conductor is 81, then what is the no. of conductor in its outer layer?
(a)36
(b)18
(c)24
(d)none

5.Two questions based on percentage utilisation(p.u) calculation like , p.u. calculation is given with respect to some old base and to calculate it with reference to new base.

6.Which table is referred for sag calculation?

7.in a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, what will be the power factor?
(a) 9 deg
(b) 18 deg
(c) 36 Deg
(d)none

8. In an incandescent lamp which is true?
(a)luminous intensity is more than non-luminous intensity
(b)luminous intensity is less than non-luminous intensity


9. In which motor no-load to full-load diff. is lowest
(a) series motor
(b) shunt motor
(c) Compound motor

10. In a 60Hz induction motor full load speed is 850 rpm then what is the Synchronous speed?
(a) 900 rpm
(b) 950 rpm
(c) 1600rpm
(d) none

11. A sync. Motor is running at synch. Speed, if D.C. excitation is removed, then
(a) it will rotate at slip speed
(b) it will stop
(c) it will continue to rotate at sync.Speed
(d) none of the above situations.

12. A transmission line is designed for 50Hz, 440KV. If we want to transfer power at 60Hz, 440 KV, then the power transfer capability will
(a) decrease
(b) Increase
(c) None

13. Increased rotor resistance in rotor ckt of induction motor is related with
(a) high starting torque
(b) more speed variation

14. In the formulae E = 4.44 f N Ô, Ô is
(a) Avg value
(b) Rms value
(c) Maximum value

15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then find rms power ?

16. Input impedence of MOSFET is
(a) more than BJT
(b) less than BJT

17. Half-Adder,full-Adder implimentation Using NAND gate

18. Truth table of AND, NOR, NAND, OR, EX-OR ETC

19. Conversion of Binary number into Equivalent decimal No.

20. Megger is used for the measurement of
(a) Insulation resistance
(b) Conductor resistance

21. Form factor for sinusoidal as well as DC

22. Formulae of Regulation (Vs- Vr)* 100/ Vr, then transmission line is
(a) short transmission line
(b) long transmission line
(c) medium transmission line

23. Improvement in power factor reduces
(a) power consumed by consumer
(b) power generation
(c) both a & b

24. Question related to field test of Series Motor

25. Question related to No-load test for Synchronous motor

26. An AC voltage of 50Hz is impressed in a resistive ckt, the oscillating power has a frequency
(a) 50 Hz
(b) 100 Hz
(c) no oscillating power is there in resistive ckt

27. Insulation used in transformer ___________leakage flux.
(a) increases
(b) decreases
(c) does not affect

28. After rain what happens to Insulator
(a) break-down strength of Insulator decreases
(b)Arch length reduces

29. Diversity factor helps to
(a)Read diversity factor
(b)load factor
(c)Reserve capacity factor

30. Why capacitance is shown as a Shunt element in analysis of transmission line?

31. B-R-Y sequence is followed in three phase system, if phase voltage in B-phase is Vm sin 100, then the phase voltage in R-phase would be

32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is
(a) pure resistive ckt
(b) pure capacitive ckt
(c) pure inductive ckt

33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W,what is the time constant

34. In electro-dynamometer A,meter & wattmeter the type of scale is
(a)Uniform
(b)Non-uniform

35. For the same current carrying capacity corona loss of ACSR will be ________than copper conductor.
(a) more
(b) less
(c) equal

36. A R-C ckt , supplied with DC, a bulb is connected across the Capacitor,what happens to the illumination, if we change the capacitance.

37. Questions based on surge impendence of over-head and under-ground cable

38. Colour-coding of resistor with tolerance Red,Red,Yellow,Gold

39. Basic electricity and Magnetism questions based on
Biot-savart law, current carrying conductor properties

40. Question on Faraday's laws of electrolysis.

APTITUDE QUESTIONS
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Questions based on

Ratio proportion
Time and Work
Time and distance
Profit-Loss
Geometry