CS6401 Important Questions Operating Systems

CS6401 Important Questions Operating Systems Regulation 2013 Anna University free download. Operating Systems Important Questions pdf free download.

Sample CS6401 important questions:

1. What is meant by Mainframe Systems?

Mainframe systems are the first computers developed to tackle many commercial and scientific applications. These systems are developed from the batch systems and then multiprogramming system and finally time sharing systems.

2. What is meant by Batch Systems?

In this, operators batched together jobs with similar needs and ran through the computer as a group .The operators would sort programs into batches with similar requirements and as system become available, it would run each batch.

3. What is meant by Multiprogramming?

Several users simultaneously compete for system resources (i.e) the job currently waiting for I/O will yield the CPU to another job which is ready to do calculations, if another job is waiting. Thus it increases CPU utilization and system throughput.

4. What is meant by Time-sharing Systems?

Time Sharing is a logical extension of multiprogramming .Here, CPU executes multiple jobs by switching among them, but the switches occur so frequently that the users can interact with each program while it is running.

5. What are the Components of a Computer System?

• Application Programs
• System Program
• Operating System
• Computer Hardware

6. What are the advantages of Multiprogramming?

• Increased System Throughput
• Increased CPU utilization

7. What are Multiprocessor System?

Multiprocessor systems have systems more than one processor for communication, sharing the computer bus, the memory, clock & peripheral devices.

8. What are the advantages of multiprocessors?

• Increased throughput
• Economy of scale
• Increased reliability

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CS6551 Important questions Computer Networks

CS6551 Important questions Computer Networks Regulation 2013 Anna University free download. Computer Networks Important questions free pdf download.

Sample CS6551 Important questions:

1.What are the three criteria necessary for an effective and efficient network?

The most important criteria are performance, reliability and security. Performance of the network depends on number of users, type of transmission medium,the capabilities of the connected h/w and the efficiency of the s/w.Reliability is measured by frequency of failure, the time it takes a link to recover from the failure and the network’s robustness in a catastrophe.Security issues include protecting data from unauthorized access and viruses.

2.Group the OSI layers by function.

The seven layers of the OSI model belonging to three subgroups.network support layers: Consisting of Physical, data link and network layers and theydeal with the physical aspects of moving data from one device to another.User support layers: Consists of Session, presentation and application layers and they allow interoperability among unrelated software systems.The transport layer ensures end-to-end reliable data transmission

3. What are the features provided by layering?

It decomposes the problem of building a network into more manageable components.

Rather than implementing a monolithic piece of software that does everything implement several
layers, each of which solves one part of theproblem.

It provides more modular design. To add some new service, it is enough to modify the functionality at one layer, reusing the functions provided at all the other layers.

4. What are the two interfaces provided by protocols?

Service interface
Peer interface
Service interface-defines the operations that local objects can perform on the protocol.
Peer interface-defines the form and meaning of messages exchanged between protocol peers to implement the communication service.

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Ma6453 Important questions PROBABILITY AND QUEUEING THEORY

Ma6453 Important questions PROBABILITY AND QUEUEING THEORY Regulation 2013 Anna University free download. PROBABILITY AND QUEUEING THEORY Important questions free download.

Sample Ma6453 Important questions:

1. Find the mean and variance of the following distributions:
Binomial, Poisson( Refer B: page no:179,183)

2. Find the mean and variance of the following distributions :
Geometric and Exponential(Refer B : page no:185,212)

3. Prove that Poisson distribution is the limiting form of
Binomial distribution. (Refer B: page no : 181)

4. Each of the 6 tubes of a radio set has a life length (in yrs) which may be considered as a RV that follows a weibull distribution with parameters α = 25 and β = 2. If these tubes function independently of one another, what is the probability that no tube will have to be replaced during the first 2 months of service? (Refer C: page no : 2.82)

5.It is known that the probability of an item produced by a certain
machine will be defective is 0.05. If the produced items are sent to the market in packets of 20, fine the no. of packets containing at least, exactly and atmost 2 defective items in a consignment of 1000 packets using (i) Binomial distribution (ii) Poisson approximation to binomial distribution. (Refer C: page no : 2.28)

6. The daily consumption of milk in excess of 20,000 gallons is
approximately exponentially distributed with θ = 3000. The city has a
daily stock of 35,000 gallons. What is the probability that of two days
selected at random, the stock is insufficient for both days.
(Refer C: page no : 2.74)

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