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ABB Placement Paper : ABB Placement Paper 07 July 2010


Hi friends,
I attended ABB last week and the test pattern is as follows:

1) Verbal section - 20 (20 mins): Very easy. No need special preps
2) Analytical - 20(25 mins): Somewhat tough. Time matters
3) Attention to detail - 15(15 mins): Easy. Questions like which two are alike
4) Technical - 60(60 mins): Very tough. Questions from almost every nook and corner of EEE.
More questions from switchgears, circuit breakers. etc

The test will be online and there is sectional cut-off. The shortlisted will be called to Bangalore.

More of technical. Be thorough with ur basics like the current eqn in series RLC circuit. Questions may be from anywhere. Prepare ur project and paper well. They asked
abt the paper for one hr. Very tricky hr questions will be asked. If u clear this round there will be a psychometric test and HR round again. Not like all other companis.

U should be very formal and prepare well

ABB Placement Paper : ABB Placement Paper 28 Sepember 2011

ABB Questions was like below:


1.What would be the output of the following program.
extern int a;
int a=20;
(a) 20 (b) 0 (c) garbage value (d) error!!

2.What would be the output of the following program.
int a[5]={2,3};
printf("\n %d %d %d",a[2],a[3],a[4]);
(a) garbage value (b) 2 3 3 (c) 3 2 2 (d) 0 0 0

3.What would be the output of the following program.
printf("\n %d %d %d %d",i,j,k,m);
(a) -2 3 0 1 (b) -3 2 0 1 (c) -2 3 1 1 (d) error

4.What would be the output of the following program.
int a,b;
printf("%d %d",a,b);
sumdig(int n)
static int s=0;
int d;
else return(s);
(a) 12 6 (b) 6 12 (c) 3 15 (d) error

5.What would be the output of the following program.
#define CUBE(x) (x*x*x)
int a,b=3;
printf("\n %d %d",a,b);
(a) 64 4 (b) 27 4 (c) 27 6 (d) 64 6

6.What would be the output of the following program.
const int x=get();
(a) 20 (b) garbage value (c) error (d) 0

7.A function has this prototype void f1(int **x),
How will you call this function?
(a) int **a; (b) int a; (c) int *a; (d) int a=5;
f1(a); f1(&a); f1(&a); f1(&&a);

8.pointout the error, if any, in the for loop
int l=1;
(a) The condition in the for loop is a must (b) The two semicolons should be dropped
(c) The for loop should be replaced by awhile loop (d) No error

9.Can the following piece of code be executed?
int main(void)
char strA[10]="compile",strB[10];
char * my_strcpy(char *destination,char *source)
char *p=destination;
return destination;
(a) Compilation will only give a warning but will proceed to execute & will display "compile"
(b) The compilation error char *(char *,char *) differs in levels of indirection from ,int(), will occur
(c) Yes & it will print compile on the screen (d) None of the above

10.What would be the output of the following program.
char str[5]="fast";
static char *ptr_to_array = str;
(a) Compilation will only give a warning but will proceed to execute & will display "fast"
(b) display "fast" on screen (c) will give a compilation error (d) none of the above

11.What would be the output of the following program.
int num,*p;
(a) 6 (b) 5 (c) junk value (d) compilation error

12.What would be the output of the following program.
int a[3]={2,3,4};
char *p;
p=(char *)((int *)p+1);
(a) 2 (b) 0 (c) junk value (d) 3

13.What would be the output of the following program.
int i=10;
fn(int i)
return ++i;
(a) 10 (b) 11 (c) 12 (d) Compilation error

14. What will be the value of i & j after the loop isexecuted?
(a) i=4,j= 24 (b) i=24,j= 24 (c) i=25,j= 25 (d) i=5,j=25

15.What would be the output of the following program.
int i,j;
(a) 11 (b) 10 (c) 4 (d) compilation error

16.What would be the output of the following program.
int i=7;
(a) 49 (b) 56 (c) 72 (d) compilation error

17. What will the printf print?
char *p,*f();
printf("f() returns:%s\n",p);
char *f()
char result[80];
strcpy(result,"anything will do");
return (result);
(a) f() returns: anything will do (b) f() returns:
(c) compilation error (d) The printf statement is not going to be executed

18.How many times the following program would print ,Jamboree,?
printf("\n Jamboree");
(a) infinite number of times (b) 32767 times
(c) 65535 times (d) till the stack does not overflow

19.Notice the error in the default statement in the code snippet below.Will it give a compilation error?
int a=10,j;
case 30: printf("the value is 30");
case 50: printf("the value is 50");
default:printf("the value is not 30 or 50");
fn(int a)
return (++a);
(a) Will display "the value is 30" (b) Will display "The value is not 30 or 50"
(c) Yes a compilation error would happen
(d) No compilation errors but there will be no output on the screen

20.What would be the output of the following program.
struct emp
char name[20];
int age;
float sal;
struct emp e = {"tiger"};
printf("\n %d %f",e.age,e.sal);
(a) 0 0.000000 (b) Garbage values (c) Error (d) none of the above

ABB Placement Paper : ABB Placement Paper 11 Sepember 2011

Major portion was from high level concepts of RDBMS and DBA. 5-6 questions from C, 5-6 from Unix, 2-3 about binary-decimal and 2-3 from OS and Networking.

1. Which directory contains info about user accounts in UNIX

2. What does EXP command do?
a) create backup
b) recovery

3. Lowest layer of UNIX
a) Hardware
b) Kernel
c) Shell
d) None

4. What does whoami command do?---(ans)current user.

5. Which command is used for help on a particular command in UNIX?---(ans)man command

6. What file does the ODBC look for to load drivers?
a) odbc.ini
b) odbc.dll
c) odbcdvr.ini
d) none

7. printf("f=%o",f)--output?

8. How do we write comments in sql;

9. Function of ipconfig,

10. What is the extension of oracle reports---optiond like RPF,RDf,REP etc;

11. OS is a _______? ans-system software

12. Windows is ____________?single user/multitasking OS.

13. Linking can happen at wich time?
a) compile,
b) load,
c) run;
d) all

14. Questions on report generation in oracle.

15. #define a 10
void main()
#define a 50;

16. In hierarchial model-hash function used to find wat?-
a) primary key,
b) root,
c) child;
d) none

17. Hierarichal model given by IBM

18. Which model has top down approach----ans:hierarchical model

19. printf("\nsb");

20. define_editor="emacs" in sql*plus means??
ans-- emacs become default editor

21. In wich type we need to take arr size greater than the input lenght:

22. Int a[100];
value of a[50]???

23.Some program on post,pre increment in C

24. A ques on outer join

25. A dbms query to insert values in only 2 columns of a table hacin 3 columns

26. 1 gigabyte=1073741824;

27. Atomic units of databse are _____________?---indivisible;

28. You are running a query against a relational database.

Referring to the scenario above, what clause or command do you use in the query to help avoid a costly tablescan?

Choice 1
GROUP BY clause
Choice 2
INDEX command
Choice 3
HAVING clause
Choice 4
FROM clause
Choice 5
WHERE clause [/quote]

29. For performance, you denormalize your database design and create some redundant columns.

Referring to the scenario above, what RDBMS construct can you use to automatically prevent the repeated columns from getting out of sync?

Choice 1
Choice 2
Choice 3
Choice 4
Stored procedures
Choice 5

30. Which one of the following capabilities do you expect to see in a majority of RDBMS extensions to ANSI SQL-92?

Choice 1
Encryption key management
Choice 2
Graphical User Interface Widgets
Choice 3
Thread creation, execution, & coordination
Choice 4
Network socket creation/operation
Choice 5
If/Then, for, do/while statements

31. Which of these is data dictionary software package::
1. DB/DC dictionary
4. metadata

32. What is Demorgans law?

33. C bitwise left shift RHS operator?? ans-- <<=

34. Functions in c for memory allocation and deallocation??
malloc and free

35. Convert 45 into binary and tell MSB and LSB?

36. Convert .0111 into decimal

ABB Placement Paper : ABB Placement-Paper 14 Auguest 2011

ABB technical questions with answers

1. In a ckt. We are giving voltage of 50 Hz as well as 60. then what will be the resultant frequency.
Less than 50
More than 60
In between 50 & 60
according to our conclusion answer will be none because if we apply two frequency component resultant frequency we can not say with such an ease.

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 with earlier one.
Answer. no change since it is a parallel combination.

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..

5. 1 Two questions based on p.u. calculation like , p.u. calculation is given with respect to some old base and u have to calculate it with reference to new base.
(new resistance/old)=(mva new /mva old)*(old voltage/new voltage)
2. Other question is based upon transfer of p.u calculation in transformer i.e. how base changes when we we move from primary to secondary or like some more on p.u calculation.

6.which table is referred for sag calculation-
(a)stringing chart..answer a R-L ckt a ac voltage is applied , such that instantaneous power is negative for 2ms, then what will be the power factor.
a) 9 deg,
(b) 18 deg,
(c) 36 Deg.

8. In an incandescent lamp
(a) luminous intensity is more than non-luminous intensity
(b), u should confirm it further.
Ans: Since efficiency is less than 100%, hence ans is

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

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) 1600 rpm
Ans: (a)

11. A sync. Motor is running at synch. Speed, if al of sudden 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
Ans: (a), because actually it will acts as Induction motor.

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,
Ans: (a) P=( |Vt| |Ef| sin (delta) ) / X, where (delta) is torque angle.

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

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

15. Voltage & current in a ckt is given by V= V1+j V2 and I= I1 +j I2, then rms power is (refer book by Edministrator on NETWORK ..)

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

17, 18. Remember 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
Ans: (a)

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, (c) medium
Ans: (a)

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

24. Read about field test of Series Motor

25. No-load test for Synchronous motor, the graph is drawn
(a) stator open ckt emf Vs field current (Ans: a)

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

27. Insulation used in transformer ___________leakage flux.
(a) increases,
(b) decreases
Ans: (b)

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

29.Diversity factor helps to . . . .(what ?)
[Read diversity factor, load factor, Reserve capacity factor in depth, with calculation]

30. Why capacitance is shown as a Shunt element in analysis of transmission line
(a) it is between Conductor & earth,
(b) because Admittance is used for calculation of capacitive reactance
Ans: (a)

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
(a) Vm sin (-20)

32. In a particular ckt I = Im Sin (wt -270) and V = Vm Sin wt, then type of ckt is (a) pure resistive ckt [Ans]

33. In a L-R ckt energy lost = 2000 W, energy conserved = 500W, then what is the time constant
Ans: time constant = L/R = 0.5

34. In electro-dynamometer A,meter & wattmeter the type of scale is Ans: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, then what happens to the illumination, if we change the capacitance.
Ans: No change at all

37. Read about surge impendence of over-head and under-ground cable, Surge impedence formula = sqrt(L/C)

We are not mentioning the options in sequence, and do not think that ans for the most questions is option (a). Read all options very carefully as all are very close to each other.


1. About 10 quanti questions ( based on Mixture, Work etc. of very easy type)

2. What is GDP ?

3. Vector algebra, codition for Co-planer vector etc.

4. Gravitation, geo-synchronous satellite( it,s hight, orbit , radius etc.), escape velocity, how g (gravitational accln) varies, about gravitational potential.

5. Basic electricity and Magnetism----Biot-savart law, current carrying conductor properties.

6. Nuclear physics, Bohr,s constant, and Other theories related .

7. Problem based on VIBGYOR , how wave length and frequency is varying.

8. Questions based on Plank,s Theory, E =hv

9. V=u + at , V2=u2 + 2as and W = mgh questions based on above theory

10. Faraday,s laws of electrolysis, m = Zit

11. Heat conduction problem.

12. Co lour-coding of resistor (BBROYGBVGW)

13. How velocity of light changes in different medium while frequency remain unchanged.

14. statistics , calculation of mode, co-efficient regression (3-4 Questions)

15. f(x) = Sin x + Cos x, find the maximum value of the function

16. Formulae for parallel plate capacitor and force between plates.
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