Placement Papers - Cisco

Cisco Systems
Cisco Placement Paper Pattern (Aptitude + Technical)
Posted by :
Namathoti Siva
(12)
Cisco Placement Paper Pattern
 
 

Here are some Questions from cisco(M.Tech.)

Technical--24
Aptitude.--20
 
    
On   cmos power( formula- P=CV*Vf
  
     
Lowest   noise margin in which logic family--
   (a) TTL  (b) CMOS  (c)  biCMOS    (d)  all have same                  
  
     
If   CMOS has tr(rise time)=tf. find Wp/Wn. given beta(n)=2*beta(p)
  
     
gm   of a transistor is proportional to
   (a)Ic (b)Vt (c)1/Vt (d)none
  
     
If   A and B are given in 2\'s complement find A-B in decimal.
  
     
Set   up time, hold time ,clock to Q delay time (very important)
  
     
.3   questions on opamp (transfer function)(2 marks each)
  
     
2   questions on sequence detector (2 marks each)
  
     
Logic   function Boolean expressions (true/false) (3 question-1 mark each)   probabily   all false
  
     
In   I/O mapped how do you represent memory(1 mark) 
                  
     
The   design of FSM (finite state machine) will--
      (a) increase time of design
      (b) increase delay
      (c) increase power
      (d) all of the above
  
     
K-map   minimization
  
     
Phase   locked loop (PLL) 1 question
  
  
  
SECTION 1 -- BASIC DIGITAL SECTION 




    
In   order to find out stack fault of a three input nand gate how many necessary   input vectors are needed ?
  
     
What   is parity generation ?
  
     
A   nand gate becomes ___ gate when used with negative logic ?
  
     
What   is the advantage of cmos over nmos ?
  
     
What   is the advantage of synchronous circuits over asynchronous circuits ?
  
     
What   is the function of ALE in 8085 ? 
                        
     
A   voice signal sample is stored as one byte. Frequency range is 16 Hz to 20   Hz. What is the memory size required to store 4 minutes voice signal?
     
What   will the controller do before interrupting CPU?
     

     
In   a normalized floating point representation, mantissa is represented using 24   bits and exponent with 8 bits using signed representation. What is range ?
  
     
The   stack uses which policy out of the following-- LIFO, FIFO, Round Robin or   none of these ?
  
     
Where   will be the actual address of the subroutine is placed for vectored   interrupts?
  
     
Give   the equivalent Gray code representation of AC2H.
  
     
What   is the memory space required if two unsigned 8 bit numbers are multiplied ?
  
     
The   vector address of RST 7.5 in 8085 processor is _______.
  
   Ans. 003C (multiply 7.5 by 8 and convert to hex)
     
Subtract   the following hexadecimal numbers--- 8416 - 2A16
  
     
Add   the following BCD numbers--- 1001 and 0100    
            
     
How   much time does a serial link of 64 Kbps take to transmit a picture with 540   pixels
  
     
Give   the output when the input of a D-flip flop is tied to the output through the   XOR gate.
  
     
How   much time does a serial link of 64 Kbps take to transmit a picture with 540   pixels.
  
     
Give   the output when the input of a D-flip flop is tied to the output through the   XOR gate.
  
     
Implement   the NOR gate as an inverter.
  
     
What   is the effect of temperature on the Icb in a transistor
  
     
What   is the bit storage capacity of a ROM with a 512*4 organization?
  
     
What   is the reason of the refresh operation in dynamic RAM\'s ?
  
     
Suppose   that the D input of a flip flop changes from low to high in the middle of a   clock pulse. Describe what happens if the flip flop is a positive edge   triggered type?
  
     
How   many flip flops are required to produce a divide by 32 device ?
  
     
An   active HIGH input S-R latch has a 1 on the S input and a 0 on the R input.   What state is the latch in?
  
     
Implement   the logic equation Y = C^BA^ + CB^A + CBA with a multiplexer.
     (where C^ stands for C complement)
     
Equivalent   Gray code representation of AC2H.
  
     
What   does a PLL consist of ? 
                         
   
  
     II - Software Section



    
The   starting location of an array is 1000. If the array[1..5/...4] is stored in   row major order, what is the location of element [4,3]. Each word occupies 4   bytes
  
     
In   a tertiary tree, which has three childs for every node, if the number of   internal nodes are N, then the total number of leaf nodes are
  
     
Explain   the term "locality of reference" ?
  
     
What   is the language used for Artificial Intelligence
           
   Ans: lisp
  
     
What   is the character set used in JAVA 2.0 ?
            
     Ans: Unicode
  
     
char   a =0xAA ;
     int b ;
      b = (int) a ;
     b = b >> 4 ;
     printf("%x",b);
     What is the output of the above program segment ?
  
     
struct   s1 { struct { struct { int x; } s2 } s3 }y; How does one access x in   the above given structure definition ?
  
     
Why   there is no recursion in Fortran ?
      Ans. There is no dynamic allocation.
  
     
What   is the worst case complexity of Quick sort?
     Ans. O(n2)
  
     
What   will be sequence of operating system activities when an interrupt occurs?