Mid-Sem Paper Solutions:

Note: Provide justification for your choice; else you will get zero, More than one choice may be the right answer.

Question:
When using Agile methods, planning is usually done based on:
A.    Scheduled Milestones                   B. Series of Releases
C.    Fixed Requirements                      D. Technical feasibility

Answer: B
Series of Releases

Justification:
AGILE methodology is a practice that promotes continuous iteration of development and testing throughout the software development life-cycle of the project. In Agile Planning, Selection of features develops during a specific set of time(The sprint).

Basically, in an Agile Project - release plan is focused on planning multiple iterations in an effort to determine when each release will be delivered. In order to achieve the product vision,

Tip: There are lots of reasons which you can use here, the basis on your work. If you have worked in an agile project. 

Question:
All of the following statements concerning stakeholders are true except
A.    Differences between or among stakeholders should be resolved in favor of the customer.
B.    Managing stakeholder expectations may be difficult because stakeholders often have very different objectives that may come into conflict.
C.    Project stakeholders may influence the course of the project and its results.
D.    Differences between or among stakeholders should be resolved in the most cost-efficient manner consistent with project objectives.

Answer: D
Differences between or among stakeholders should be resolved in the most cost-efficient manner consistent with project objectives.


Question:
During a company event, you had the opportunity to talk to a colleague project manager. He told you that in his current project actual costs are15% under cumulated costs scheduled for today. What do you think?
A.    The information available is not sufficient to assess project performance.
B.    The project will probably be completed with total costs remaining under budget.
C.    A significant cost increase during the further course of the project will probably bring the costs back to the baseline level.
D.    Original cost planning must have been poor to allow this variance.

Answer: A
The information available is not sufficient to assess project performance.

 2015 - 2016
Comprehensive Examination (Regular) 

Question) Indicate True or False for following statements with a justification within 30 words. No credit is given for answers with no justification.  

a. For successful design, you must practice diversification followed by convergence.
Answer)TRUE
b. Appraisal cost is likely to be the most expensive element of cost of quality.
Answer)TRUE
c. Before an architectural pattern is chosen for use in a particular system it must have a code implementation to expedite its reuse.
Answer)FALSE
d.Quantitative methods for evaluating the quality of proposed architectural designs are freely available.
Answer) FALSE
e. In component-based software engineering, the team searches for available components at the outset of the project.
Answer)FALSE
f. With thorough testing it is possible to remove all defects from a program prior to delivery to the customer.
Answer)FALSE
g. Many software metrics can only be measured indirectly.
Answer)TRUE
h. Software testing is deemed complete at end of budgeted duration for testing.
 Answer)FALSE
i. Design patterns are not applicable to the design of object-oriented software.
Answer)FALSE

Question) Differentiate the following: 
a. Analysis vs. design

Question:
Assume that there are two algorithms A and B for a given problem P. The time complexity functions of algorithms A and B are 5n and log2n    respectively. Which algorithm should be selected assuming that all other conditions remain the same for both the algorithms?

Solution:
Assuming that all conditions remain the same for both algorithms, the best algorithm takes less time when the input is changed to a larger value. Results obtained employing different values of n are shown below:

QUESTION 1.For each of the following applications,  determine whether  TCP or UDP is used as the transport layer protocol  and explain the reason(s) for your choice [5 x 2 = 10]
a)File Transfer
b)Watching a real time streamed video
c)Web browsing
d)A Voice over IP (VoIP) telephone conversation

Solution
a)File transfer :This should be TCP The reason is that you want a file to be transmitted in its entirety without any errors, therefore the error detection and correction properties of TCP are needed.
b)Watching a real time streamed video :This should be UDP. The reason is that when watching a movie, delay is critical and therefore there simply isn't any time to seek the retransmission of any errors. The simplicity of UDP is therefore required.
c)Web browsing :This should be TCP The reason is that web pages need to be delivered without error so that all content is properly formatted and presented. Therefore the error detection and correction properties of TCP are needed.
d)A Voice over IP (VoIP) telephone conversation :This should be UDP. The reason is that a telephone conversation has strict timing requirements for the transfer of data and seeking the retransmission of any errors would introduce too much delay. Therefore the simplicity of UDP is needed.

Section – A (7 x 8 marks = 56 marks)

Question 1.The co-ordinates of only one eighth of the total pixels lying on circumference of a circle are computed. Why? The Bresenhem’s circle drawing algorithm can be adapted for computing the coordinates of other pixels, explain?

Solution Scheme: 
Circle is symmetric about its axis. So, if point (x,y) is on the circle, then we can trivially compute (450 segment) seven other points (y,x),(y,-x),(x,-y),(-x,-y),(-y,-x),(-y,x),(-x,y) using the symmetry.(2 marks)
Bresenhem’s circle drawing algorithm (6 marks)

Question 2.Cohen-Sutherland line clipping technique uses the concept of region codes (or outcodes) in order to clip lines. Suppose a rectangular clip window ABCD is defined such that the lower left hand corner is at A(1,2) and upper right hand corner is at C (9,8). Clip the following line segments using Cohen Sutherland technique
  Line 1 from P(-1,7) to Q(11,1)
  Line 2 from R(3,7) to S(3,10)
  Line 3 from U(2,3) to V(8,4).