Placement Papers - Cisco

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?