# Unit: 1. Introduction of Operations Research and Linear Programming. Department of Computer Science and Technology. Q : 1 Short Answer Questions:

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1 0 Unit: Introduction of Operations Research and Linear Programming Q : Short nswer Questions:. Write the definition of operation research.. Write the definition of solution, basic solution.. What is linear programming problem?. How will you construct a mathematical model?. Write down any two scopes of operation research.. Describe the phase formulating the problem.. Define i] Solution ii] asic solution.. Define feasible solution.. Define LPP in the mathematical form. 0. Give any four models of operations research.. List different activities of marketing.. List different activities of personnel management.. What is model?. State any four application of OR.. dvantages of OR study.. Disadvantages of OR study.. Define unbounded solution.. Define feasible and Infeasible solution.. What is extreme point? 0. Draw graph for a + b 0, Where a,b 0.. State the different scope of operation research.. What are various phases of operation research?. What is model? List out the model. Q : Long nswer Questions.. firm manufactures two products and b on which the profits earned per unit are Rs and Rs respectively. Each product is processed on two machines M and M. Product requires one minute of processing time on M and two minutes on M while requires one minute on M and one minute on M. Machine M is available for not more than hours, while machine M is available for 0 hours during any working day. Formulate the number of units of products and to be manufactured to get maximum profit.. The C Company has been a producer of picture tubes for television sets and certain printed circuits for radios. The company has just explained into full scale production and marketing of M and M-FM radios. It has built a new plant that can operate hours per week. Production of an M radio in the new plant will require hours and production of an M-FM radio will require hours. Each M radio will contribute Rs. 0 to profits while an M-FM radio will contribute Rs. 0 to profits. The marketing departments, after extensive research, have determined that a maximum of M radios and 0 M-FM radios can be sold each week. Formulate the LPP.. Sudhakant has two iron mines. The production capacities of the mines are different. The iron ore can be classifies into good, mediocre and bad varieties after certain process. The owner has decided to supply or more tons of good iron, or more tons of mediocre iron Page

2 0 and or more tons of bad iron per week. The daily expense is Rs.000 and that of the second mine is Rs.00. The daily production of each type of iron is given in the table. Mine Daily production Good Mediocre ad I II Formulate the LPP.. Write the steps for solving Linear Programming Problem by Graphical method. State its limitations.. Solve the following LP problems graphically Minimize Z = x + x x + x 0, x + x, x + x x, x 0. Solve the following LP problems graphically Maximize Z = 0 x + 0 x x + x 0 x + x x, x 0. Find the solution using graphical method Max z = x+x x+x 000 x+x 00 x 00 x,x 0. Solve the following LP graphically: Maximize z= 000x + 000x x + x x + x x 0 x 0 x, x 0. Explain the history of operations research. 0. Write the algorithm to solve LPP using Graphical method for maximization of profit.. Give the limitations of operations research.. Note down the applications of operations research.. Write down meanings of operations research.. Solve the following LP graphically: Maximize z = x + x x + x 000 x + x 00 Page

3 0 x 00 x, x 0. Solve LP graphically Maximize z = 00x + 00x x + x 0 x + x x, x 0. Solve LP graphically Max Z = 0x + 0x x + x 0 x x and x, x 0. Discuss various phases in solving an OR problem.. Explain the steps involved in the solution of an operation research problem.. Define O.R. and discuss its scope. 0. Discuss the inportence of OR in decision making. Q : Multiple choice questions.. Operation research approach is ) Multi-disciplinary ) rtificial C) Intuitive D) ll of the above. Operation research analysis does not ) Predict future operation ) uild more than one model C) Collect the relevant data D) Recommended decision and accept. Mathematical model of Linear Programming is important because ) It helps in converting the verbal description and numerical data into mathematical expression ) Decision makers prefer to work with formal models. C) It captures the relevant relationship among decision factors. D) It enables the use of algebraic techniques.. constraint in an LP model restricts ) Value of the objective function ) value of the decision variable C) Use of the available recourses D) all of the above. In graphical method of linear programming problem if the ios-cost line coincide with a side of region of basic feasible solutions we get ) Unique optimum solution ) unbounded optimum solution C) No feasible solution D) Infinite number of optimum solutions. feasible solution of LPP ) Must satisfy all the constraints simultaneously ) Need not satisfy all the constraints, only some of them C) Must be a corner point of the feasible region D) all of the above. The objective function for a L.P model is x+x, if x=0 and x=0, what is the value of the objective function? Page

4 0 ) 0 ) 0 C) 0 D) 0. Maximization of objective function in LPP means ) Value occurs at allowable set decision ) Highest value is chosen among allowable decision C) None of the above D) ll of the above. lternative solution exist in a linear programming problem when ) One of the constraints is redundant ) Objective function is parallel to one of the constraints C) Two constraints are parallel D) ll of the above 0. Linear programming problem involving only two variables can be solved by ) ig M method ) Simplex method C) Graphical method D) None of these. The linear function of the variables which is to be maximize or minimize is called ) Constraints ) Objective function C) Decision variable D) None of the above. physical model is an example of ) n iconic model ) n analogue model C) verbal model D) mathematical model. If the value of the objective function z can be increased or decreased indefinitely, such solution is called ) ounded solution ) Unbounded solution C) Solution D) None of the above. model is ) n essence of reality ) n approximation C) n idealization D) ll of the above. The first step in formulating a linear programming problem is ) Identify any upper or lower bound on the decision variables ) State the constraints as linear combinations of the decision variables C) Understand the problem D) Identify the decision variables. Constraints in an LP model represent ) Limitations ) Requirements C) alancing limitations and requirements Page

5 0 D) ll of above. The best use of linear programming is to find optimal use of ) Money ) Manpower C) Machine D) ll of the above. Which of the following is assumption of an LP MODEL? ) Divisibility ) Proportionality C) dditively D) ll of the above. efore formulating a formal LP model, it is better to ) Express each constraint in words ) Express the objective function in words C) Verbally identify decision variables D) all of the above 0. Non-negative condition in an LP model implies ) positive coefficient of variables in objective function ) positive coefficient of variables in any constraint C) Non-negative value of recourse D) None of the above Q: True or false.. dding a constraint to a linear programming problem increases the size of the feasible region.. The following constraint is linear: *+* 0.. The two objective functions (Maximize X + Y, and Minimize -X-Y) will produce the same solution to a linear programming problem.. Redundancy causes major difficulties to an LP problem.. ll linear programs must seek to maximize some quantity.. When we say that proportionality exists, we mean that if one unit of a product takes two units of a resource, then three units of the product will take three units of the resource.. If the right-hand side of a constraint is changed, the feasible region will not be affected and will remain the same.. One of the quickest ways to plot a constraint is to find the two points where the constraint crosses the axes, and draw a straight line between these points.. If the objective function coefficients are slightly changed within certain limits, the current optimal solution may remain optimal. 0. Changes in the technological coefficients affect the shape of the objective function.. The first step in formulating a linear programming problem should be to identify the objective and constraints.. Linear programming is a model consisting of linear relationships representing a firm's decisions given an objective and resource constraints.. The objective function is a linear relationship reflecting the objective of an operation. Page

6 0. linear programming model consists of decision variables, constraints, but no objective function.. feasible solution violates at least one of the constraints.. In a linear programming model, the number of constraints must be less than the number of decision variables.. Linear programming models have an objective function to be maximized but not minimized.. Linear programming models exhibit linearity among all constraint relationships and the objective function.. The graphical approach to the solution of linear programming problems is a very efficient means of solving problems. 0. Slack variables are only associated with maximization problems.. Surplus variables are only associated with minimization problems Q: Fill in the blanks.. The graphical method can only be used when there are decision variables.. The term implies that one or more variables in the solution and the profit can be infinitely large.. When the slope of the objective function is the same as the slope of one or more constraints, we may have.. To find the optimal solution to an LP problem when using the graphical method, we must first identify the.. The problem involves a decision as to which products to produce given limited resources.. The is that region which satisfies all constraints.. The represents all points that result in a specified profit.. n important function of sensitivity analysis is to.. Isoprofit method involves graphing profit lines. 0. The for a constraint is the value of one additional unit of a scarce resource.. is the first step in formulating an LP problem.. LP theory states that the optimal solution to any problem will lie at.. of a system of two equations in two variables is an ordered pair that makes both equations true.. of a system of linear inequalities is an ordered pair that is a solution of each inequality in the system.. The graph of the system of constraints in linear programming is called the.. is the process of optimizing a linear objective function subject to a system of linear inequalities.. graphical solution is limited to solving linear programming problems with only decision variables.. The optimal solution to a linear programming model always occurs at a (an) point of the feasible region.. Multiple optimal solutions can occur when the objective function line is to a constraint line. 0. The property of linear programming models indicates that the decision variables cannot be restricted to integer values and can take on any fractional value. Page

7 0 Unit: Simplex Method for Solution of LPP Q : Short answer question.. Define surplus variables.. What is the criterion for the entering variable and outgoing variable?. Define artificial variables.. Define slack variables.. When is ig M method useful?. What is the condition for optimality in simplex table?. What is the condition for entering variable in simplex table?. Write the standard form of LPP for the following LPP: M a x im iz e Z x x S u b je c t to x x 0, x x, x, x 0. Write the standard form of LPP for the following LPP: M a x im iz e Z x x S u b je c t to x x, x x, x, x 0 0. What is the artificial variable?. List assumption of linear programming.. Limitations of Linear Programming. Write the steps of the algorithm for solving LPP by the Simplex method.. What does the Cj. Explain what the shadow price represents in a simplex final solution.. Explain how an unbounded solution is recognized when calculating the simplex tableaus.. Explain how a multiple optimal solution is recognized when using the simplex algorithm.. Explain how no feasible solution is recognized when using the simplex algorithm.. Explain how degeneracy is recognized when using the simplex algorithm. Q: Long answer questions:. Explain about ig M method for solving LPP by the Simplex method.. Maximize z = x + x x + x x + x x, x 0. Maximize z = 0 x + 0 x x + x 0 x + x x, x 0. Maximize Z = x + x x + x, Page

8 0 x + x x, x 0. Maximize Z = x + x x + x, X + x, X, x 0. Maximize Z = x + x x + x, X + x 0, X, x 0. Maximize Z = x + x x + x, x + x x, x 0. Solve by ig M method Maximize Z = x x x + x, x + x, x, x 0. Solve by ig M method Maximize Z = x x + x x - x - x -, x + x -, x, x, x 0 0. Solve the following LP problem using simplex method. Maximize z = x + x + x x + x + x 0 x + x 0 x + x 0 x, x, x 0. Use penalty (ig M) method to maximize: z = x - x x + x x + x x x, x 0. Solve by simplex method: Min z = x - x + x x x + x -x + x -x + x +x 0 Page

9 0 x, x, x 0. Solve by simplex method: Max z = x + x + x x + x x + x 0 x + x +x x, x, x 0. manufacturer of three products tries to follow a policy of producing those which continue most to fixed cost and profit. However, there is also a policy of recognising certain minimum sales requirements currently, these are: Product: x x x Units per week: There are three producing departments. The production times in hour per unit in each department and the total times available each week in each department are: Departments Time required per production in hours Total hours available x x x The contribution per unit of product x, x, x is Rs. 0.0, Rs..00 and Rs..00 respectively. The company has scheduled 0 units of x, 0 units of x and 0 units of x for production in the following week, you are required to state: ) Whether the present schedule is an optimum one from a profit point of view and if it is not, what it should be; ) The recommendations that should be made to the firm about their production facilities.. Use the simplex method solve the following LP problem : Max Z = 0x + 0y +0z 0x + y + z 0,000 x +0y + z,000 x + y + z,000 x, y, z 0. manufacturer of bags makes three types of bags P, Q and R which are processed on three machines M, M and M. ag P requires hours on machine M and hours on machine M and hours on machine M. ag Q requires hours on machine M, hours on machine M and hours on machine M and ag R requires hours on machine M and hours on machine M. There are hours of time per day available on machine M, 0 hours of time per day available on machine M and hours of time per day available on machine M. The profit gained from bag P is Rs.00 per unit, from bag Q is Rs.00 per unit and from bag R is Rs.00 per unit. What should be the daily production of each type of bag so that the products yield the maximum profit?. Comment on the solution of the following LP problem: Max Z = -x + x x Page

10 0 x x x, x 0.. Comment on the solution of the following LP problem: Min Z = x + x x + x 0 x + x x + x x, x 0.. Comment on the solution of the following LP problem: Max Z = x + x x + x x + x x, x Comment on the solution of the following LP problem: Max Z = x + x + x x + x + x x + x + x x, x, x 0. Q: Multiple Choice Questions:. The role of artificial variables in the simplex method is (a) To aid in finding an initial solution (b) To find optimal dual prices in the final simplex table. (c) To start with ig M method. (d) To start with ig M method.. For a maximization problem, the objective function coefficient for an artificial variable is (a) + M (b) M (c) Zero (d) None of these. For maximization LPP, the simplex method is terminated when all values (a) cj zj 0 (b) cj zj 0 (c) cj zj = 0 (d) zj 0. To convert inequality constraints into equality constraints, we must (a) dd a surplus variable (b) Subtract an artificial variable (c) Subtract a surplus variable and an add artificial variable (d) dd a surplus variable and subtract an artificial variable.. If any value in b - column of final simplex table is negative, then the solution is (a) Unbounded (b) Infeasible (c) Optimal (d) None of these. To convert inequality constraints into equality constraints, we must (a) dd a surplus variable (b) Subtract an artificial variable (c) Subtract a surplus variable and an add artificial variable (d) dd a surplus variable and subtract an artificial variable. 0 P a g e

11 0. t every iteration of simplex method, for minimization problem, a variable in the current basis is replaced with another variable that has (a) a positive cj zj value (b) a negative cj zj value (c) cj zj = 0 (d) None of these. In the optimal simplex table cj zj = 0 value indicates (a) Unbounded solution (b) Cycling (c) lternative solution (d) None of these. variable which does not appear in the basis variable column of simplex table is (a) Never equal to zero (b) lways equal to zero (c) Called basic variable. (d) None of these 0. To formulate a problem for solution by the simplex method, we must add artificial variable to (a) Only equality constraints (b) Only > constraints (c) oth (i) & (ii) (d) None of these. If all xij values in the incoming variable column of the simplex table are negative, then (a) Solution is unbounded (b) There are multiple solution (c) There exist no solution (d) None of these. If an artificial variable is present in the basic variable column of optimal simplex table, then the solution is (a) Unbounded (b) Infeasible (c) Optimal (d) None of these. If for a given solution, a slack variable is equal to zero, then (a) The solution is optimal (b) The solution is infeasible (c) There exist no solution (d) None of these. Linear programming problem involving more than two variables can be solved by (a) Simplex method (b) Graphical method (c) Matrix minima method (d) None of these. In the simplex method, a tableau is optimal only if all the cj zj values are (a) Zero or negative. (b) Zero. (c) Negative and nonzero. (d) Positive and nonzero.. For the basic feasible solution to remain optimal (a) ll cj - zj values must remain 0. (b) No objective function coefficients are allowed to change. (c) The value of the objective function must not change. (d) Each of the above is true.. Consider the following linear programming problem. Maximize 0 X + 0 X + 0 X : X + X + X 0 X + X + 0 X 00 X = 0 X 00 X, X, X 0 How many slack, surplus, and artificial variables would be necessary if the simplex algorithm were used to solve this problem? (a) slack, surplus, and artificial (b) slack, surplus, and artificial (c) slack, surplus, and artificial (d) slack, surplus, and artificial P a g e

12 0. The following are constraints which have had slack variables added. X + X + S = 0 X + X + S = If X = and X =, what are the values for S and S? (a) S = 0, S = (b) S =, S = (c) S =, S = (d) S = 0, S = 0. solved LP problem indicated that the optimal solution was X =0 and X =0. One of the constraints was X + X 0. This constraint has (a) Surplus greater than zero. (b) Slack greater than zero. (c) Surplus equal to zero. (d) Slack equal to zero. 0. The solution to the dual LP problem (a) Presents the marginal profits of each additional unit of a resource. (b) Can always be derived by examining the Zj row of the primal's optimal simplex tableau. (c) Is better than the solution to the primal. (d) ll of the above Q: True or False. basic feasible solution is a solution to a linear programming problem that corresponds to a corner point of the feasible region.. surplus variable is added to a constraint in order to create equality, and represents a quantity of unused resource.. surplus variable is added to an = constraint in order to utilize the simplex algorithm.. If all of a resource represented by a slack variable is used, that slack variable will not be in the production mix column of a linear programming simplex tableau.. Even if an LP problem involves many variables, an optimal solution will always be found at a corner point of the n-dimensional polyhedron forming the feasible region.. correctly formulated linear program, when solved with the simplex algorithm, will always yield a single optimal solution.. Unlike the Solver algorithm, Simplex will only produce a single solution even if multiple solutions exist.. Surplus variables, like slack variables, carry a zero cost.. The constraint X + X algorithm, will be X + X 0. The constraint X + X algorithm, will be X + X. The constraint X + X = 0, when converted to an = constraint for use in the simplex algorithm, will be X + X + M = 0.. Linear programming has few applications in the real world due to the assumption of certainty in the data and relationships of a problem.. Typically, real world applications of linear programming are solved with a computer program that utilizes the simplex algorithm.. The basic process of the simplex algorithm is to find solutions to a set of simultaneous equations where we have more variables than equations.. It is possible for an equation in the simplex table to have both a slack and a surplus variable at the same time. P a g e

13 0. In the simplex table, a coefficient of zero in a constraint implies that the variable with the zero coefficient has no influence on the solution for that iteration.. The simplex method considers both feasible and infeasible solutions.. The simplex method finds a solution by solving for the intersection of two constraints.. When the optimal solution is found, all slack and surplus variables have a value of zero. 0. The numbers in the body of the simplex table may be thought of as the solutions. Q : Fill in the blanks.. Simplex method was developed by in.. ccording to fundamental theorem of linear programming, we can search the solution among the basic feasible solutions.. If a constraint has a sign, in order to convert it into an equation we use variables.. If a constraint has a sign then to convert it into an equation we use variables.. linear programming problem is said to have an solution if the objective function can be increased or decreased indefinitely.. To convert the problem of minimization into the maximization problem we multiply both sides by.. To solve a L.P.P. by simplex method all bj s should be.. If in the simplex table all j 0, the solution under test is.. The linear programming problem has no solution if the solution contains one or more artificial variables as basic variables. 0. If in the final simplex table all j < 0, the optimal solution is.. If corresponding to maximum positive j all minimum ratios are negative or, the solution under test is.. slack variable is introduced if the given constraint has sign.. Simplex method to solve linear programming problems was developed by.. Fundamental theorem of L.P.P. states that if the given L.P.P. has an optimal solution then at least basic solution must be optional.. In phase of two phase method we remove from the basic matrix.. The problem has solution if the value of at least one artificial variable present in the basis is non-zero and the optimality condition is satisfied.. To prepare a less-than-or-equal constraint for use in a simplex table, we must add a(n) variable.. To prepare a greater-than-or-equal constraint for use in a simplex table, we must add. P a g e

14 0 Unit : Transportation and ssignment Problem (TP & P) Q: Short answer questions.. What is Transportation problem?. State the mathematical formulation for T.P.. What is an ssignment Problem?. What is the difference between ssignment Problem and Transportation Problem?. State the mathematical formulation for.p.. What is the Travelling salesman problem?. Write steps for North-West Corner Method.. Write steps for Matrix Minima Method.. What is difference between transportation problem and assignment problem? 0. Give the algorithm of NWCM to obtain basic feasible initial solution to transportation problem.. Give the algorithm of LCM to obtain basic feasible initial solution to transportation problem.. Give the algorithm of VM to obtain basic feasible initial solution to transportation problem.. Write the steps for solving a.p. by Hungarian method. Write the steps for transportation algorithm.. Define feasible solution.. What is basic feasible solution?. Define optimal solution.. State different methods to obtain the initial basic feasible solution.. What are the properties of non-degenerate solution? 0. How do the MODI and stepping-stone methods differ? Q: Long answer questions.. Three fertilizers factories X, Y and Z located at different places of the country produce, and lakh tones of urea respectively. Under the directive of the central government, they are to be distributed to States, and C as, and lakh respectively. The transportation cost per tones in rupees is given below: C X Y Z 0 Find out suitable transportation pattern at minimum cost by North West Corner method and Least Cost method.. Determine an IFS by Vogel s pproximation method. Source D D D D Supply S S S Demand. departmental has five employees with five jobs to be performed. The time ( in hours) each men will take to perform each job is given in the effectiveness matrix. P a g e

15 0 How should the jobs be allocated, one per employee, so as to minimize the total man-hours. Employees jobs a 0 b c 0 d e 0. city corporation has decided to carry out road repairs on main four arteries of the city. The government has agreed to make a special grant of Rs 0 lakh towards the cost with a condition that repairs are done at the lowest cost and quickest time. If the conditions warrant, a supplementary token grant will also be considered favorably. The corporation has floated tenders and five contractors have sent in their bids. In order to expedite work, one road will be awarded to only one contractor. Cost of Repairs (Rs in lakh) Contractors R R R R R C C 0 C C 0 C 0 Find the best way of assigning the repair work to the contractors and the costs. If it is necessary to seek supplementary grants, what should be the amount sought?. company has factories at F, F & F which supply warehouses ay W,W and W. Weekly factory capacities are 00,0 and 0 units respectively. Weekly warehouses requirements are 0,0 and 0 units respectively. Unit shipping costs ( in rupees) are as follows: Warehouse Factory w w w Supply F 0 00 F 0 F 0 Demand Determine the optimum distribution for this company to minimize the shipping cost.. Obtain the initial solution to above TP using northwest corner method. D D D D Supply O O O Dem. 0. Obtain the initial solution to bellow TP using least cost method. C D Supply I II III Demand. Obtain the initial solution to elow TP using least cost method. D D D D Supply O P a g e

16 O O Demand C D Supply I II III 0 IV Demand Obtain the initial solution to above TP using northwest corner method. 0. I II III IV Supply C Demand 0 Obtain the initial solution to above TP using Vogel s approximation method.. D D D D Supply O 0 O 0 O 0 Demand Obtain the initial solution to above TP using Vogel s approximation method. I II III IV 0 C 0 Demand Obtain the optimal solution to above TP. Supply 0. a b c Supply I 0 II 0 0 III IV 0 Demand 0 0 Obtain the initial solution to above TP using northwest corner method.. Warehouses W W W W Supply F F F Demand Obtain the optimal solution to above TP.. Solve the following ssignment Problem P Q R S 0 P a g e

17 C D 0 0. Solve the following ssignment Problem I II III IV 0. Solve the following ssignment Problem C D E F 0. Solve the following ssignment Problem P Q R S C D. Find the assignment of salesmen to various districts which will result minimum cost. Salesman District 0 C D 0. Solve the following assignment problem so as to minimize the time (in days) required to complete all the task. Person task 0 C D 0. n automobile dealer wishes to put four repairmen to four different jobs. The repairmen have somewhat different kinds of skills and they exhibit different levels of efficiency from one job to another. The dealer has estimated the number of man hours that would be required for each jobman combination. This is given in the matrix form. Find the optimum assignment that will result in minimum man hours needed. C D. Solve the following transportation problem to find its optimal solution: (MODI) W W W W Supply P P a g e

18 P P Demand Find initial basic feasible solution by Vogel s Method and North West Corner Method. Destination supply I II Source III Demand 0. Solve the following transportation problem to find its optimal solution: (MODI) C vailable I II 0 0 III Required Q: Multiple Choice Questions:. The initial solution of a transportation problem can be obtained by applying any known method. However, the only condition is that (a) The solution be optimal (b) The rim condition are satisfied. (c) The solution not is degenerate. (d) ll of the above.. The dummy source or destination in a transportation problem is added to (a) Satisfying condition. (b) Prevent solution from becoming degenerate. (c) Ensure that total cost does not exceed a limit. (d) ll of the above.. The occurrence of degeneracy while solving a transportation problem means that (a) Total supply equals total demand (b) The solution so obtained is not feasible. (c) The few allocations become negative. (d) None of the above.. n alternative optimal solution to a minimization transportation problem exists whenever opportunity cost corresponding to unused routes of transportation is: (a) Positive and greater than zero. (b) Positive with at least one equal to zero. (c) Negative with at least one equal to zero. (d) ll of the above.. One disadvantage of using North-West Corner Rule to find initial solution to the transportation problem is that (a) It is complicated to use. (b) It does not take into account cost of transportation. (c) It leads to degenerate initial solution (d) ll of the above.. The solution to a transportation problem with m-rows and n-columns is feasible if numbers of positive allocations are (a) m+n (b) m x n (c) m + n - (d) all of the above.. The calculation of opportunity cost in the MODI method is analogous to a (a) cj zj value for non-basic variable columns in the simplex method. (b) Value of a variable in b-column of the simplex method. (c) Variable in xb-column. (d) ll of the above. P a g e

19 0. If we were to use opportunity cost value for an unused cell to test optimality, it should be (a) Equal to zero. (b) Most negative number. (c) Most positive number. (d) ll of the above.. n assignment problem is considered as a particular case of a Transportation problem because (a) The number of rows equals columns (b) ll xij= 0 (c) ll rim conditions are (d) ll of above. 0. For a salesman who has to visit n cities, following are the ways of his tour plan (a) n! (b) ( n + )! (c) ( n - )! (d) n. Every basic feasible solution of a general assignment problem having a square pay-off matrix of order n should have assignments equal to (a) n + (b) n- (c) m+n+ (d) m+n. The purpose of a dummy row or column in an assignment problem is to (a) Obtain balance between total activities and total resources (b) Prevent a solution from becoming degenerate (c) Provide a means of representing a dummy problem (d) None of the above.. The Hungarian method for solving an assignment problem can also be used to solve (a) transportation problem (b) traveling salesman problem (c) oth (i) and (ii) (d) Only (ii). n optimal of an assignment problem can be obtained only if (a) Each row and column has only one zero element (b) Each row and column has at least one zero element (c) The data are arrangement in a square matrix (d) None of the above. The method used for solving an assignment problem is called (a) Reduced matrix method (b) MODI method (c) Hungarian method (d) None of the above. Which method usually gives a very good solution to the assignment problem? (a) Northwest corner rule (b) Vogel's approximation method (c) MODI method (d) stepping-stone method. The transshipment model is an extension of the transportation model in which intermediate transshipment points are between the sources and destinations. (a) Decreased (b) Deleted (c) Subtracted (d) dded. In the process of evaluating location alternatives, the transportation model method minimizes the (a) Total demand (b) Total supply (c) Total shipping cost (d) Number of destinations. In an assignment problem, (a) One agent can do parts of several tasks (b) One task can be done by several agents (c) Each agent is assigned to its own best task (d) None of the above 0. In a transportation problem, items are allocated from sources to destinations (a) t a maximum cost (b) t a minimum cost (c) t a minimum profit (d) t a minimum revenue P a g e

20 0 Q: True or False. Time series methods tend to be most useful for short-range forecasting.. n exponential smoothing forecast will react more strongly to immediate changes in the data than the moving average.. Longer-period moving averages react more quickly to recent demand changes than do shorterperiod moving averages.. The Delphi method for acquiring informed judgments and opinions from knowledgeable individuals uses a series of questionnaires to develop a consensus forecast about what will occur in the future.. Time series methods assume that what has occurred in the past will continue to occur in the future.. The operating characteristics of a queuing system provide information rather than an optimization of a queuing system.. Queuing analysis is a deterministic technique.. cereal company that is planning on marketing a new low-cholesterol cereal should be concerned about the states of nature--that is the probability that people will stay interested in eating healthy foods.. The expected opportunity loss criterion will always result in the same decision as the expected value criterion. 0. Transportation problems and assignment problems both of these problem types could not be solved using simplex algorithm.. Vogel s approximation method tackles the problem of finding a good initial solution by taking into account the costs associated with each route alternative.. The optimal solution of a transportation model provides a shipping pattern with the lowest total shipping cost.. In a transportation problem, number of sources must be same as number of destinations.. In a transportation problem, the total demand of destinations must be identical to the total capacity of sources, otherwise QM cannot solve it.. In the assignment model, each person can be assigned to one and only one job.. the assignment model, each job will be done by one and only one person.. The assignment problem can be viewed as a special transportation problem in which every source has capacity and every destination has demand.. The transportation problem can be viewed as an assignment problem and solved by using the assignment model.. Demands of destinations is (are) the input(s) for solving a transportation problem. 0. In the data-entering table of QM s transportation model, a source takes a row. Q: Fill in the blanks.. In the data-entering table of QM s transportation model, a source takes a.. In the result of QM s transportation model, if it shows that Source should ship units to a dummy destination, then it means that.. Dummy source or dummy destination will occur in the case of.. In a transportation problem, we must make the number of and equal.. The net cost of shipping one unit on a route not used in the current transportation problem solution is called the. 0 P a g e

21 0. The procedure used to solve assignment problems wherein one reduces the original assignment costs to a table of opportunity costs is called.. The method of finding an initial solution based upon opportunity costs is called.. occurs when the number of occupied squares is less than the number of rows plus the number of columns minus one.. oth transportation and assignment problems are members of a category of LP problems called. 0. The equation Ri + Kj = Cij is used to calculate.. The transportation problem is to transport various amounts of a single homogenous commodity, that are initially stored at various origins, to different destinations in such a way that the total transportation cost is.. In a balanced m n transportation problem =, where ai s are capacities of the sources and bjs are requirements of the destinations.. The transportation problem can be regarded as a generalization of the.. feasible solution of m by n transportation problem is said to be non-degenerate basic solution if number of positive allocations is exactly equal to.. y north-west corner rule we always get a basic feasible solution.. The optimality test is applicable to a F.S. consisting of allocations in independent positions.. In a transportation problem the solution under test will be optimal and unique if all the cell evaluations are.. In Vogel s approximation method the differences of the smallest and second smallest costs in each row and column are called.. In computational procedure of optimality test we choose that u i or vj = 0 for which the corresponding row or column has the number of individual allocations. 0. The iterative procedure of determining an optimal solution of a minimization transportation problem is known as. Unit: Games Theory and Sequencing Problems Q: Short nswer Questions.. Define terms: ctivity, Event, Merge Event, urst Event, Total float, Free float, Critical path, critical activity. State Rules for Network Diagram.. What is sequencing problems?. What is dummy activity?. What is successor activity?. Write similarities and differences between PERT and CPM.. Write applications of PERT/CPM techniques.. Write uses of PERT/CPM techniques.. Write the steps for processing n jobs through two machines.. Define Competitive game. Define payoff matrix. Define pure Strategies. Define Mixed Strategies. Define saddle point. Define optimal strategies P a g e

22 0. Explain two-person zero sum game, giving a suitable example.. Explain minimax principle used in the theory of games.. Explain maximin principle used in the theory of games. 0. What is game in game theory?. What are the properties of a game?. Explain the best strategy on the basis of minimax criterion of optimality.. Write the notation of t, T, I.. Explain Number of Machines.. Define Processing Time.. Define Processing Order.. Define idle time on a Machine.. Define Total Elapsed Time.. Determine the value of the game. Player Player - 0. Determine the value of the game. Player Player Q: Long nswer Questions.. State the major limitations of the game theory.. Explain the difference between pure strategy and mixed strategy.. What are the assumptions made in the theory of game?. Explain four elements that characterize a sequencing problem.. Explain the principal assumptions made while dealing with sequencing problem.. Give three different examples of sequencing problems from your daily life.. Write a short note on the sequencing decision problem for n jobs on two machines.. company management and the labor union are negotiating a anew three year settlement. Each of these has strategies: I: Hard and aggressive bargaining II:- Reasoning and logical approach III:- Legalistic strategy IV:- Conciliatory approach The cost to the company is given for every pair of strategy choice. Union Company Strategies Strategies I II III IV I 0 II 0 III 0 0 IV - 0. Find the range of values of p and q that will render the entry a saddle point for the game. Player Player P a g e

23 0 q P 0 0. For what value of λ, the game with following pay-off matrix is strictly determinable? Player Player λ - λ - - λ. Determine which of the following two-person zero-sum games are strictly determinable and fair. Give the optimum strategies for each player in the case of it being strictly determinable. a) Player Player - b) Player Player Solve the following games by using maximum principle, whose payoff matrix are given below: Include in your answer: (i) strategy selection for each player, (ii) the value of the game to each player. Does the game have a saddle point? a) Player Player 0 b) Player Player P a g e

24 c) Player Player d) Player Player Q: Multiple Choice Questions.. Two person zero-sum game means that the (a) Sum of losses to one player is equal to the sum of gains to other (b) Sum of losses to one player is not equal to the sum of gains to other (c) oth (a) and (b) (d) None of the above. Game theory models are classified by the (a) Number of players (b) sum of all payoffs (c) Number of strategies (d) all of the above. game is said to be fair if (a) oth upper and lower values of the game are same and zero (b) Upper and lower values of the game are not equal (c) Upper value is more than lower value of the game (d) None of the above. What happens when maximin and minimax value of the game are same? (a) No solution exists (b) Solution is mixed (c) Saddle point exists (d) None of the above. mixed strategy game can be solved by (a) lgebraic method (b) Matrix method P a g e

25 0 (c) Graphical method (d) ll of the above. The size of the payoff matrix of a game can be reduced by using the principle of (a) Game inversion (b) rotation reduction (c) Dominance (d) game transpose. The payoff value for which each player in a game always selects the same strategy is called the (a) Saddle point (b) Equilibrium point (c) oth (a) and (b) (d) None of the above. Games which involves more than two players are called (a) Conflicting game (b) Negotiable game (c) N-person game (d) ll of the above. When the sum of gains of one player is equal to the sum of losses to another player in a game, this situation is known as (a) iased game (b) Zero-sum game (c) Fair game (d) ll of the above 0. When no saddle points is found in a payoff matrix of a game, the value of the game is then found by (a) Knowing joint probabilities of each row and column combination to calculate excepted payoff for that combination and adding all such values (b) Reducing size of the game to apply algebraic method (c) oth (a) and (b) (d) None of the above. saddle points exists when (a) maximin value = maximax value (b) minimax value = minimum value (c) minimax value = maximin value (d) none of the above. In a mixed strategy game (a) No saddle points exists (b) Each player always selects same strategy (c) Each player always selects same strategy without considering other player s choice (d) ll of the above. In a pure strategy game (a) ny strategy may be selected arbitrarily (b) particular strategy is selected by each player (c) oth players always select their optimal strategy (d) None of the above. Linear programming method should be used to determine value of the game when size of payoff matrix is (a) X (b) X (c) mx (d) Xn. Game theory is the study of (a) Selecting optimal strategies (b) Resolving conflict between players (c) oth (a) and (b) (c) None of the above. If there are in jobs to be performed one at a time, on each of m machines, the possible sequences would be (a) (!) (b) (!) (c)( ) (d) ( ). Total elapsed time to processes all jobs through two machines is given by (a) + (b) + (c) ( + ) (d) none of the above. The minimum processing time on machine and are related as (a) Min = Max (b) Min Max (c) Min Max (d)max Min. You would like to assign operators to the equipment that has (a) Most jobs waiting to be processed (b) Job with the earliest due date P a g e

26 0 (c) Job which has been waiting longest (d) ll of the above 0. Unforeseen factors the prevent the plans from actually happening are (a) Equipment may develop a fault (b) Specifications may be changed (c) dditional order may arrive to be added to schedules (d) ll of the above Q: Fill in the blanks.. game is said be if lower and upper values of the game are same as well as zero.. course of action that puts any player in the most preferred position irrespective of the course of action chosen by the competitor is called.. If a game involves more than two players, then it is called a game.. The pure strategy on the only course of action that is being chosen by a player.. The rules of are used to reduce the size of the payoff matrix.. The is used to determine the probability of using different strategies by both the players.. The is used to find the optimal strategy for each player in a payoff matrix of size X without saddle point.. The is useful for game where payoff matrix is of size Xn or mx.. The method is useful for game with larger payoff matrix without saddle point. 0. The concept of is used in simplifying the solution of a rectangular game. Q: True of False In a row person zero-sum game, a saddle point always exists. If there are only two strategies, the payoff matrix has a saddle point. In a pure strategy game, each player always plays just one strategy. In a mixed strategy game, each player random by chooses the strategy to be used. mixed strategy game is based on the assumption that players act irrationally. The strategy for a player is a course of action that the adopts for each playoff. The value of the game is the expected outcome per play when players follow their optimal strategy.. The payoff is a quantitative measure of satisfaction that a player gets at the end of the play.. If the maximin value is same as the minimax value, than the game is said to have a saddle point. 0. game said to be strictly determinable if lower and upper values of the game are equal. Unit: Project Scheduling (CPM and PERT) Q: Short nswer Questions.. Define terms: ctivity, Event, Merge Event, urst Event, Total float, Free float, Critical path, critical activity. State Rules for Network Diagram.. What is sequencing problems?. What is dummy activity? P a g e

27 0. What is successor activity?. Write similarities and differences between PERT and CPM.. Write applications of PERT/CPM techniques.. Write uses of PERT/CPM techniques.. Write the steps for processing n jobs through two machines. Q: Long nswer Questions.. Draw the Network Diagram for the following activities and find the critical path. Job C D E F G H I J K Job time(days) 0 0 Immediate predecessors C E D,F E H G,I J. project has the following time Schedule. Construct a PERT network and compute Critical Path and its duration. lso calculate Total float,free float. ctivity Time in Weeks ctivity Time in Weeks. project schedule has the following characteristics. Construct the PERT network and find the critical path and time duration of the project. ctivity Time. Write down the procedure to obtain optimum completion time using Critical Path method.. Find the critical path and calculate the Total float and Free float for the following PERT diagram small maintenance project consists of the following jobs Jobs - - Duration Duration Duration Jobs Jobs in days in days in days P a g e

28 Draw the arrow network of the project. Determine the critical path.. project has the following time schedule: ctivity Time ctivity Time ctivity Time In month In month In month Construct PERT network and compute total float for each activity. Find Critical path with its duration.. Installation of air population control equipments requires following activities: Draw network diagram from the following activates and find Critical Path ctivity C D E F G H Time Immediate Predecessor none none C C D,E F,G. Draw network diagram from following details and calculate critical path from it. ctivity C D E F G H I J Time Immediate,C,C E E D,G F,H,I Predecessor 0. Draw network diagram from following details. ctivity C D E F G H Predecessor,C E D,F G ctivity. Listed in the table are the activities and sequencing necessary for a maintenance jobs on the heat exchangers in a refinery. ctivity C D E F G H I J Predecessor C C F,G D,E,H I ctivity. Determine the critical path from the following network diagram project consists of a series or tasks labeled,.., H, I with the following relationships (W< X, Y, means X and Y cannot start until W is completed; X,Y<W means W cannot start until both X and Y are completed). With this notation, construct the network diagram having the following constraints: <D,E;,D < F; C<G; <H; F,G <I P a g e

29 0 Task C D E F G H I Time 0 0. Draw a network diagram for following activity: ctivity Description Required Predecessor Duration Product design (None) months Market research (None) C Production analysis D Product model E Sales brochure F Cost analysis C G Product testing D H Sales training, E I Pricing H J Project report F, G, I Q: Multiple Choice Questions.. dummy activity is required when a. Two or more activities have the same starting events. b. Two or more activities have different ending events. c. Two or more activities have the same ending events. d. The network contains two or more activities that have identical starting and ending events.. Which of the following is a basic assumption of PERT? a. There is only one complete route from the start of a project to the end of a project. b. Only critical path activities in the network must be performed. c. ctivity completion times are known with certainty. d. No activity in the network must be repeated.. PERT analysis computes the variance of the total project completion time as a. The sum of the variances of all activities in the project. b. The sum of the variances of all activities not on the critical path. c. The variance of the final activity of the project. d. The sum of the variances of all activities on the critical path.. The critical path of a network is the a. Path with the fewest activities. b. Shortest time path through the network. c. Longest time path through the network. d. Path with the most activities.. Dummy activities a. re found in both O and ON networks. b. re used when two activities have identical starting and ending events. c. Have duration equal to the shortest non-dummy activity in the network. d. Cannot be on the critical path.. Which of the following is a limitation of PERT and CPM? P a g e

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