# Robert Bosch

ECE TECHNICAL QUESTIONS

a) 128 b) 48 c) d)

1. There was a figure of JK flip flop in which ~q is connected to J input and K=1. If clock signal is successively applied 6 times what is output sequence (q=?)

d) 010101

2. The relationship b/w Gain & Bandwidth?

a) Independent of each other

b) Gain decreases as bandwidth decreases

c) Gain increases as bandwidth increases till some extent after which stability decreases

3. In “ON CHIP” decoding memory can be decoded to

a) 2^n b)2^n +1 c)2^n -1 d) some other choice Ans: a

4. Half of address 0Xffffffff is

a) 77777777 b) 80000000 c) 7FFFFFFF d) some other choice

5. For a 4 bit succe D/A with 16v o/p the resolution is

a)10v b)1v c)1.6v d)16v Ans : b

6. A 20kva transformer at full load conditions have the coreless & cu loss are 250w&300w,To get max efficiency what will be the total loss in tr in w

a) 550 b) 500 c) 600 d) Data insufficient Ans : b

7. There was a circuit consisting of AC voltage source and one inductance. Inductance value=0.2mH AC voltage =150 sin (1000t).what is the current flowing in the circuit?

a) b) c ) d)

8. Power gain of an amplifier having i/p gain of 20W and output gain of 20mW is

a) 60 b) 25 c) 10 d) 0

9. There was a RC circuit given with AC voltage source. Expression for capacitance was asked for charging condition. Choices were somewhat like this: a) some value multiplied by exp (-t/T)

ans --c i= (Vs/R)exp(-t/ T)

10.SCR s are connected in series to get

a) high current rating b) voltage regulation c) high v rating d)some other

Ans: c

11. Which one of the following is used for high speed power application?

a) BJT b) MOSFET c) IGBT d) TRIAC

12. One question related with SCR timing dia

13. SCR is used for

a) To achieve optimum (or maximum ...not sure) dv/dt

b) For high current ratings

c) To achieve high voltage

d) Some other choice

14. State in which o/p collector current of transistor remains constant in spite of increase in base current is

a) Q point b) Saturation c) Cut off

15. what is the resonant frequency of parrel RLC circuit of R= 4.7 komh L= 2 micro Henry and c=30pf.

a). 20.5 MHz

b). 2.65 KHz

c). 20.5 KHz

d). none

16.for the parallel circuit (one figure is given) Is= 10mA. R1= 2R, R2=3R, R3= 4R. R is artritary

a). 3.076mA

b). 3.76mA

17 . Two ques on control sys like the sys will be stable when the roots are

a) real & +ve b) real & -ve c) d)

20 The ques on Niquest plot

21 0ne ques on root locus

22. One more question related with ADC like voltage is 8 volts. freqency 2 Mega hz. what is the converssion rate

23. Question related with serial in parallel out shift register…What is output sequence?

Ans..... 1010

24. Given one RLC circuit in which values of R, L and C were given. What is the value of frequency f?

25. #define A 10+10

main ()

{

int a;

a=A*A;

printf (“%d”, a);

}

a) 100 b) 200 c) 120 d) 400

ans : c

26. main(){

int n=0;

while(n>32767)

pf(“%d”,n);

n++

}

ans ; indefinite loop here ihe loop will continue again & again ie after 32767 the go to -32768

27. if (fun ())

{

X++;

}

X gets incremented if and only if

a) fun () returns 0

b) fun () return 1

c) fun () return -1

d) return a value other than 0 ans ; d

28. In dynamic memory

a) Power dissipation is less than that of static memory

b) Clock is needed

c) Refreshing is required

d) All the above

29. Short, int and long integers have how many bytes?

a)2,2,4 b) Machine dependant c)2,4,8 d) Some other choice ans : b

30. A (n) is -----------filter combination of

a) Passive b) Active c) AMPLIFIER d) BOOSTER

31. according to ohms law the current density is proportional to

a) current b) di/ds c) applied emf d)

32 Two more ques on gravity ie body is projected then find the time of fall and some physics ques

33. Structure comparison is done

a). yes

b) no

c) compiler dependent

d)

34. The system in which communication occurs in both ways but not simultaneously in both ways is

a) Half simplex b) Simplex c) Half duplex d) duplex

35. main ()

{

int a=5, b=6;

int i=0;

i=a>b? a:b;

printf (“%d”, i);

}

a) 0 b) 1 c) 6 d)5

36. int fun (char c)

{

int i;

static int y ;}

a) c, i are stored in stack and y stored in data segment

b)c stored in stack and i,y are stored in data segment

c) c is stored in text segment, y in data and i in stack

37. how would you insert pre-written code into a current program?

a) #read

b) #get

c) #include

d) #pre ans: c

38.structure may contain

a) any other structure

b) any other structure expect themselves

c) any other structure except themselves and pointed to themselves

d) none of the above

39 One ques from pointer declaration

Section II

40 If a>4,b<-1 then which of the following is true

a)2a+b<0 b) 4a<3b c) a>4b d) some oth

41 In a class out of 150 studs participated in various games foot ball ,basket ball, cricket are 120, 130,135 respecly and 5 stud are not playing any one of then then find the least no of studs which are are playing all the games

a)110 b)100 c) 96 Ans a

42. 20 men can do a work in c/2 days & 30 women can do the same work in c/3 days then how many days will take to complete the work when 20 men &30wmen work together

a)5c/6 b)c/6 c) 6c/5

43. find the lateral surface of a cone with diameter of base 12feet . and the latent height is 24feet

a) 1320square f.

b) 260 square f.

c) 96 square f.

d) none

ans : c

44. Ann is shorter than Jill and Jill is taller than Tom. Which of the following inferences are true

a) Ann is taller than Tom b) c) d) Data insufficient ans : d

45. Sum of squares of two numbers is 404 and sum of two numbers is 22.Then product of two Numbers?

a) 20 b) 40 c) d) (Answer is 40. Two numbers are 20 and 2)

46). (10 | 7) would produce

a). 17

b). 3

c). 11

d). 15

RELATED TO COMPUTER SCIENCE AND IT

1)#include.main() { int const *p = 10; printf(“%d”, ++(*p)); } Ans: Compilation Errorsol: Constant cant be modified. 2) .main(){ int I; char *a = “man”; for(i=0;i<3;i++) printf(“%c%c%c%c\n”,i[a],a[i],*(a+i),*(i+a)); } ans: mmmmaaaa nnnn 3)main(){ extern int i = 10; printf(“%d”,i); } Ans: Compiler error 4)main() { float f= 1.1; double d = 1.1; if ( f == d) printf(“I LOVE U”); else printf(“I HATE U”); } Ans: I HATE USol: Due to precision Considerations ... 5) A tree was given and postorder traversal is to be found out...(Easy) 6) What is the name of the Command used to partition the disk ANS: fdiskSol: When you run the fdisk and format commands, the Master Boot Record (MBR) and file allocation tables are created. The MBR and file allocation tables store the necessary disk geometry that allows hard disk to accept, store, and retrieve data7)A question from MS-DOSans)msconfig.exe8) A quesion is on paging(Memory management)Formulae: Effective access time=((1-p)*m+(p*s)) where (1-p) is called hit ratio, p is called page fault ratio, 'm' is called main memory access time, 's' is called pagefault service time. 9) The header file that is included to use manipulators is10) Which data structure is easier to implement the trees...???sol: Linked Lists.. 11)Function used to display the character on the console is ..??sol: PUT12) No of nodes in a perfect Binary tree is..??sol: (2*n-1)13) No of queues needed to implement the priority queue..??ans:two sol: Priority queue uses two queues1) for storing the data 2) other for storing the priorities. 14)Heterogeneous Linked List is implemented using...???sol: void pointers15) a variable used to store the address of another variable is termed as..??sol: Pointer..16) #includevoid main() { int i = 15; int const &j = i; cout << i << j << endl; i = 9; cout << i << j << endl } ANS: 15 15 9 9 17) Virtual Memory consist of main memory and ...???sol: Swap files18) Which class addressing system has less no of hosts...???sol: class D(not sure)19) Which of the following is a network layer protocola) TELNET b) FTP. c)smtp d)none sol: telnet20) many questions on computer networks....( around 10 questions....i left all of them)Prepare 'top down approach' - ross and kurose for computer networks...it would be helpful.. b) Quantitative:36) a man sells an article with a 20% discount and gain a profit of 20%...what would be the profit percentage if he sells it with 10% discount...??sol; 35(not sure)37)sum of the infinite terms in a gp is 230 and sum of squares is 23 ...find the common ratio. sol: 10/1338) fourth term of an ap is 200 and first term is 5 find the tenth term...?? 39) if S+2R=220 and S=80 then R=.???sol: 70 40) if 25% of x=y then 67.5% of x in terms of y is...sol: 100/y2 (not sure)41)A student was performing an arithmetic operation and he multiplied a number by 3/2 instead of dividing it by 2/3 ...what was its error percentage..??sol: 0% 42) Probability:a radioactive element disintegrates by 20 th part every hour and find the probability that no matter is left out in a duration of 45 min...?? sol: since it deals with radioactive element 'n' is usually large..so poissons distribution is to be applied... 1hr=60min----------20 45min----------? (45*20)/(60)=15.. Hence lamba=15
P(x=0)= (e
^{-15})*(15^{0})/(0!)=(e ^{-15})43) If side of the square is x+2 and side of equilateral triangle is 2x and the perimeters of both square and equilateral triangle are equal ...then find the value of x..??sol: 4*(x+2)=(3*2x) i.e; x=4 44) if side of the square of increased by 5 and change in area was 165 then find the value of side of the square...??sol: (x+5) ^{2}-x^{2}=16510x+25=165 10x=140 x=14 SOME MORE QUESTIONS 1. A man has to cover a distance of 45 Km. He can run at 15kmph and can walk at 5kmph. If he covers half the distance by running and half by walking then find the time taken to cover the distance. (a) 6 hrs (b) 7hrs (c) 8hrs (d) 9 hrs ans: A 2. Mr. X (father) is twice his daughter’s age. How many yrs. Ago was he three times his daughter’s age, if his daughter’s present age is 20? (a) 8 (b)10 (c) 12 (d) 15 ans: B 3.) 9, 25, 49, 81, 121, ? (a) 141 (b) 169 (c) 154 (d) 168 4.)3, 9, 27, ? , 243, 729, 2187 (a) 91 (b) 81 (c) 60 (d) 68 5.)15 men can do a job in 16 days, 12men will do the same in how many days? (a) 20 (b) 25 (c) 30 (d) 35 ans: A 6.) Which of the following comes first when written in the chronological order? (a) 100 A.D. (b) 50 B.C. (c) 500 B.C. (d) 10 A.D. ans: C 7. What is the output of the program void main() { int i,j,k; i=2; j=4; k=i++>j&2; printf("%d\n",k); if(++k && ++i<--j|| i++) { j=++k; } printf(" %d %d %d",i,-j--,k); getch(); } A. 4,-3,2 B. 5,-3,2 c. 4,-2,2 D. 5,-2,2 Ans: D 8. what the program do... vob (int a ,int b) { a=a^b; b=a^b; a=a^b; } ficssa(int a[], int n) { for(int i=0;i for(int j=i+1;j if(a[i]>a[j]) { vob(a[i],a[j]);} } } } 9. What is the output of the program #include<stdio.h> #include<conio.h> void main() { int i,j=20; clrscr(); for(i=1;i<3;i++) { printf("%d,",i); continue; printf("%d",j); break; } getch(); } // A. 1,20 // B. 1,20,1,20 // c. 1,2 // D. 1,2,20,20 Ans: c |