Pandora's Box

25 Questions

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Instructions:Questions are based on basics of C/C++ , digital and analog electronics. There are no negative marks For descriptive type of questions, try to answer precisely. Submit the answers before time runs. ​ALL THE BEST!


Questions and Answers
  • 1. 
    The terminal count of a modulus-25 binary counter is  
    • A. 

      11001

    • B. 

      11000

    • C. 

      10111

    • D. 

      100000

  • 2. 
    A ring oscillator consisting of 4 inverters is running at a frequency of 1MHz . The propagation delay per gate is 
    • A. 

      1.25 nsec

    • B. 

      125nsec

    • C. 

      0.1nsec

    • D. 

      10ns

  • 3. 
    Let k=2n.  A circuit is built by giving the output of an n-bit binary counter as input to an n to 2n bit decoder. This circuit is equivalent to a 
    • A. 

      K-bit binary up counter

    • B. 

      K- bit ring counter

    • C. 

      k-bit binary down counter

    • D. 

      K-bit Johnson counter

  • 4. 
    Assume that a 5 bit serial in/serial out shift register is initially has 10101 . If the data to be sent is 11000 (starting with the left most bit). What would be the 5-bit-pattern after fourth clock pulse.
    • A. 

      10111

    • B. 

      01110

    • C. 

      11100

    • D. 

      11000

  • 5. 
    Consider the following:a. pointer to a function that accepts 3 integer arguments and returns a floating-point quantityfloat(*pf)(int a,int b,int c);b. Pointer to a function that accepts 3 pointers to integer quantities as arguments and returns a pointer to a floating point quantityfloat*(*pf)(int*a,int*b,int*c); 
    • A. 

      A is true, b is true

    • B. 

      A is true, b is false

    • C. 

      A is false, b is false

    • D. 

      A is false, b is true

  • 6. 
    A mod2 counter followed by the mod5 counter is 
    • A. 

      Same as mod5 counter

    • B. 

      Same mod2 counter

    • C. 

      Mod7 counter

    • D. 

      Decade counter

  • 7. 
    Main(){ char*x=”String”; char y[]=”add”; char *z; z= (char *)malloc(sizeof(x)+sizeof(y)=1);strcpy(z,y);strcat(z,y);printf(“%s+%s=%s”,y,x,z);}
    • A. 

      Add+String=addString

    • B. 

      Runtimeerror/coredump

    • C. 

      Syntax error during compilation

    • D. 

      Add+String=addadd

  • 8. 
    Main(void){void f(int,int);int i=10;f(i,i++);}Void f(int i,int j){   if(i>50)    return;  i+=j;f(i,j);printf(“%d”,i);}
    • A. 

      85,53,32,21

    • B. 

      10,11,21,32,53

    • C. 

      32,21,11,10

    • D. 

      None of the above

  • 9. 
    Main(void){ int i=9;Printf(“%old  %old %old %old”,i,i++,i--,i++);}
    • A. 

      8ld 8ld 9ld 8ld

    • B. 

      9ld 8ld 9ld 8ld

    • C. 

      10ld 10ld 11ld 10ld

    • D. 

      11ld 10ld 11ld 10ld

  • 10. 
    Suppose the time taken for executing a c program( containing 1000 lines code )is 1msec and if we add 100 comments (each comment contains 10 characters )in between then the execution time will be
    • A. 

      Double

    • B. 

      Same

    • C. 

      Four times

    • D. 

      Data not sufficient to determine

  • 11. 
    Determine the forward resistance of a pn junction diode when the forward current is 5mA at T=300k (assume silicon diode)
    • A. 

      9.3 ohms

    • B. 

      10.20 ohms

    • C. 

      10.34 ohms

    • D. 

      10.50 ohms

  • 12. 
    Difference between resistor and inductor? 
  • 13. 
    Kirchhoff’s laws are valid for
    • A. 

      Linear circuit only

    • B. 

      Passive time invariant circuits

    • C. 

      Non-linear circuit’s only

    • D. 

      Both linear and non-linear circuits.

  • 14. 
  • 15. 
  • 16. 
    Removing bypass capacitor across the emitter-leg resistor in a CE amplifier causes
    • A. 

      Increase in current gain

    • B. 

      Decrease in current gain

    • C. 

      Increase in voltage gain

    • D. 

      Decrease in voltage gain

  • 17. 
    • A. 

      1 and 2

    • B. 

      1 and 3

    • C. 

      1 and 1

    • D. 

      2 and 2

  • 18. 
    • A. 

      Large gain

    • B. 

      High slew rate

    • C. 

      Wider bandwidth

    • D. 

      None of the mentioned

  • 19. 
    The 8-input XOR circuit shown has an output of Y = 1. Which input combination below (ordered A – H) is correct?
    • A. 

      10111100

    • B. 

      10111000

    • C. 

      11100111

    • D. 

      00011101

  • 20. 
    Convert the following SOP expression to an equivalent POS expression 
    • A. 
    • B. 
    • C. 
    • D. 
  • 21. 
    What is X?
    • A. 

      2-input AND gate

    • B. 

      2-input OR gate

    • C. 

      Exclusive-OR gate

    • D. 

      None of the above

  • 22. 
     Find collector current IC2, given input voltages are V1=2.078v & V2=2.06v and total current IQ=2.4mA. (Assume α=1) 
    • A. 

      0.8mA

    • B. 

      1.6mA

    • C. 

      0.08mA

    • D. 

      0.16mA

  • 23. 
    The binary code of (21.125)10 is
    • A. 

      10101.001

    • B. 

      10100.001

    • C. 

      10101.010

    • D. 

      None of the above

  • 24. 
    A debouncing circuit is
    • A. 

      An astable multi vibrator

    • B. 

      A bistable multivibrator

    • C. 

      A latch

    • D. 

      Xor gate

  • 25. 
    On the third clock pulse, a 4-bit Johnson sequence is Q0 = 1, Q1 = 1, Q2 = 1, and Q3 = 0. On the fourth clock pulse, the sequence is.....
    • A. 

      Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 1

    • B. 

      Q0 = 1, Q1 = 1, Q2 = 0, Q3 = 0

    • C. 

      Q0 = 1, Q1 = 0, Q2 = 0, Q3 = 0

    • D. 

      Q0 = 0, Q1 = 0, Q2 = 0, Q3 = 0