February 25, 2012

PI Questions for Engnieers

Computer Science & Electronics, Electrical, IT


Circuit switching / packet switching
ISO-OSI – 7 segment layer
What do u mean by a protocol
What is Piggy backing
What are the different network topologies?
Give an example of bus type network.
Explain the advantage and disadvantage of Ethernet?
What is the advantage of Ring network?

Memory management
Paging, segmentation, demand paging
Windows Vs. Linux
5. What is a binary semaphore? What is its use?6. What is thrashing?7. What are turnaround time and response time?8. What is cycle stealing?9. What are demand- and pre-paging?Data Structures / Algorithms

1 Describe the data structures of a double-linked list. How do you insert a record between how others?2. What is the difference between QUEUE and STACK?Areas: Linked lists, stacks ,queues, trees, standard algorithmsProgramming

C vs C++, java
What does static variable mean?
What is a pointer?
What is a structure?
What are the differences between structures and arrays?
In header files whether functions are declared or defined?
What are the differences between malloc() and calloc()?
What are macros? What are its advantages and disadvantages?
Difference between pass by reference and pass by value?
What is a class?
What is an object?
What is the difference between an object and a class?
What is the difference between class and structure?
What is public protected, private?
What are virtual functions?
What is friend function?
What is a scope resolution operator?
What do you mean by inheritance?
What is abstraction?
What is polymorphism? Explain with an example.
What is encapsulation?
What do you mean by binding of data and functions?
What is function overloading and operator overloading?
What is virtual class and friend class?
What do you mean by inline function?
What do you mean by public, private, protected and friendly?
When is an object created and what is its lifetime?
What is the difference between a WHILE loop and FOR loop construct?
Software Engineering

CMM, people CMM, SDLC, Software Project ManagementWhat is an MIS?DBMSNetwork, file, dbms, rdbms, normalization, boys codd, integrity constraints…1. What is DBMS?2. Advantages of DBMS?3. Disadvantages in File Processing System?4. Describe the three levels of data abstraction?5. Define the “integrity rules”6. What is E-R model?7. What is normalization?8. What is Functional Dependency? 9. What is BCNF (Boyce-Codd Normal Form)?10. What is normalization? 1NF, 2NF, 3NF..Data Communication

1. Difference between AM, PM, FM.2. What is CMRR? Explain briefly.3. What do you mean by half-duplex and full-duplex communication? Explain briefly.4. Which range of signals is used for terrestrial transmission?5. What is the need for modulation?6. Which type of modulation is used in TV transmission? 7. How do optical fibers work? Differentiate between Data and Voice Transmission8. How do cell phones work
What is data rate? What is a parity bit
What is white noise?
What is a multiplexed, demultiplexer, applications
Digital Electronics

Logic Gates, Flip-Flop- JK, RS, ripple counter, (up / down)
What is meant by D-FlipFlop?
What is the basic difference between Latches and Flip-flops?
Electronics AreasDiode, transistor, circuits, Zener, avalanche breakdown, MOSFET, filters, power electronics, buttersworth /chebyshev filters, thyristors1. What do you mean by zener breakdown and avalanche breakdown?2. What are the different types of filters?3. Transistors – Diagrams Electrical Circuits/ Machines

AC / DC motor, generator, 3 phase, power factor.
What are the different parts of a generator?
Difference between electrical and electronics engineering.
What is transmission loss? How can it be contained?
What are the step-ups and step-downs that happen from generation to your house.
Why do we use a 220V system where-as US has an 110V system. What are the advantages and disadvantages of both?
How does a 3-phase induction motor work?
How does a single phase induction motor work
12 what is HVDC? Its benefits
how can you change frequency of current?
what are the major types of loses in a transformer? How can they be reduced?
what is Vaan de graff generator? What is its use?
draw and explain circuit of tubelight?
types of motors used in different household articles like fan, cassette player, mixie?
what are circuit breakers? Why are they used? Is fuse a circuit breaker?
what is the advantage of using laplace transform for electric circuits
what is a steeper motor? Where is it used?
Other Areas

AI / Game theoryFuzzy logicQueuing theoryIP/DSPInstrumentationControl Systems

for ECE

Ques. what all these semiconductor do.-icfai
Ans :- to b updated
Ques. what is the maximum power u have handled practically-im
iAns :- to b updated
Ques. what is super conductivity -bimtech
Ans :- Superconductivity is a phenomenon observed in several metals and ceramic materials. When these materials are cooled to temperatures ranging from near absolute zero (-459 degrees Fahrenheit, […
Ques. what all these semiconductor do.-icfai
Ans :- to b updated
Ques. what is the maximum power u have handled practically-imiAns :- to b updatedQues. what is super conductivity -bimtech
Ans :- Superconductivity is a phenomenon observed in several metals and ceramic materials. When these materials are cooled to temperatures ranging from near absolute zero (-459 degrees Fahrenheit, 0 degrees Kelvin, -273 degrees Celsius) to liquid nitrogen temperatures (-321 F, 77 K, -196 C), they have no electrical resistance. The temperature at which electrical resistance is zero is called the critical temperature (Tc) and varies with the individual material. property of a superconductor is that once the transition from the normal state to the superconducting state occurs, external magnetic fields can’t penetrate it. This effect is called the Meissner effect and has implications for making high speed, magnetically-levitated trains
Ques. Why is the 1st micro processor named 8085??Ans :-8085 was an improvement on 8080 micro processor.it was fully software compatible with 8080,thats y it got the 808. The 5 was added because it was the first micro processor to run on 5 V supply.
Ques. Difference between micro processor and microcontrollerAns :-Micro processor is not a self-contained unit. It needs ROM, RAM and lot of other stuff to work. Whereas Micro controller is a self-contained processing unit. It can do processing witout any other component.
Ques. What is a flip-flop?Ans :-In digital circuits, a flip-flop is a kind of bistable multivibrator, an electronic circuit which has two stable states and thereby is capable of serving as one bit of memoryQues. What is a register?Ans :-
Ques.Difference between GSM and CDMA technology?Ans :-GSM and CDMA represent different ways of sharing the spectrum.CDMA uses same frequency for a number of signals. This is possible because of Analog to digital conversion and then encoded with a random signal. Then decoded at the receiving end using decoding algorithem. Hence lot of ppl can talk wiht out interference. Whereas GSM, the no. of ppl who can share a particular freq is limited. Specturm is divided in frequency and then time slots are allotted….for callers… :Due to spectrum constraints, CDMA which needs less spectrum for the same number of calls, has advantage over GSM. And it’s less costly to set up as well.

Ques.What is the difference between 8085 and 8086 microprocessor?Ans :
-Ques. what is diode and thyristor, fuzzy logic,capacitor(where do u use),filter?Ans :-
Ques. what is zero crossing rate ?Ans :-
Ques. different parts of speech processing?Ans :-Ques. diff b/w digital and analog?Ans :
-Ques. where in this room (interview room) can u find a rectifier ,capacitor , transistor etcAns :-u will find a capacitor,resistor in fan. also the tubelight choke is an inductor and resistor.What is the difference between real ground and virtual ground?Ans :
-Ques. What is hole theory?Ans :-
Ques. What is avalanche effect?Ans :-
Ques. Difference between CDMA and GSM?Ans :-
Ques. What is GPRS? How does it work?Ans :-
Ques. Have you heard of 4th generation mobile techlogy?Ans :-Ques. What is S/N ratio?Ans :-Ques. What is transponder?Ans :-
Ques. What are the types of soldering?Ans :-
Ques.What are the disadvan
tage of FM ?(short coverage due to Line of sight comm.)Ans :
-Ques.How many states does signal has ?Ans :- there are 3 states in a signal: on state, off state, tri state
Ques. which software is used to design a software IC using VHDLAns :- altera
Ques. How many type of resistances are there in a diodeAns :- Two, one when forward biased have zero resistance and the other when reverse biased has infinite resistance
Ques. What type of architecture is used in 8085 microprocessor?Ans :- Von-Neumann architecture
Ques. What are semiconductor devicesAns :- A semiconductor device is a device which has a pn junction in it.Ex. Diode, transistor.Basically they are different in conduction property. these materials are not conductors by default they become conductors in some cicumstances like, increase in temperature or difference in the charge density, etc.Germanium and silicon are the best examples of semiconductors.

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