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- From: Mathematics,
- Posted on: Mon 20 Jan, 2014
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Request Description

1.

In a problem involving capital budgeting applications, the 0-1 variables designate the acceptance or rejection of the different projects.

AnswerTrue

False

1.

In a 0-1 integer programming problem involving a capital budgeting application (where xj = 1, if project j is selected, xj = 0, otherwise) the constraint x1 - x2 ? 0 implies that if project 2 is selected, project 1 can not be selected.

AnswerTrue

False

1.

The solution to the LP relaxation of a maximization integer linear program provides an upper bound for the value of the objective function.

AnswerTrue

False

1.

If we are solving a 0-1 integer programming problem with three decision variables, the constraint*x*1 +*x*2 ? 1 is a mutually exclusive constraint.

AnswerTrue

False

1.

If we are solving a 0-1 integer programming problem, the constraint*x*1 ?*x*2 is a conditional constraint.

AnswerTrue

False

1.

A conditional constraint specifies the conditions under which variables are integers or real variables.

AnswerTrue

False

1.

If the solution values of a linear program are rounded in order to obtain an integer solution, the solution is

Answer

always optimal and feasible |
||

sometimes optimal and feasible |
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always optimal but not necessarily feasible |
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never optimal and feasible |

1.

If we are solving a 0-1 integer programming problem, the constraint*x*1 =*x*2 is a __________ constraint.

Answer

multiple choice |
||

mutually exclusive |
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conditional |
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corequisite |

1.

You have been asked to select at least 3 out of 7 possible sites for oil exploration. Designate each site as S1, S2, S3, S4, S5, S6, and S7. The restrictions are:

Restriction 1. Evaluating sites S1 *and*S3 will prevent you from exploring site S7.

Restriction 2. Evaluating sites S2*or*

S4 will prevent you from assessing site S5.

Restriction 3. Of all the sites, at least 3 should be assessed.

Assuming that Si is a binary variable, write the constraint(s) for the second restriction

Answer

S2 +S5 ? 1 |
||

S4 +S5 ? 1 |
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S2 +S5 + S4 +S5 ? 2 |
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S2 +S5 ? 1, S4 +S5 ? 1 |

1.

The solution to the linear programming relaxation of a minimization problem will always be __________ the value of the integer programming minimization problem.

Answer

greater than or equal to |
||

less than or equal to |
||

equal to |
||

different than |

1.

The Wiethoff Company has a contract to produce 10000 garden hoses for a customer. Wiethoff has 4 different machines that can produce this kind of hose. Because these machines are from different manufacturers and use differing technologies, their specifications are not the same.

Write the constraint that indicates they can purchase no more than 3 machines.

Answer

Y1 + Y2 + Y3+ Y4 ? 3 |
||

Y1 + Y2 + Y3+ Y4 = 3 |
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Y1 + Y2 + Y3+ Y4 ?3 |
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none of the above |

1.

In a capital budgeting problem, if either project 1 or project 2 is selected, then project 5 cannot be selected. Which of the alternatives listed below correctly models this situation?

Answer

x1 + x2 + x5 ? 1 |
||

x1 + x2 + x5 ?1 |
||

x1 + x5 ? 1, x2 + x5 ? 1 |
||

x1 - x5 ? 1, x2 - x5 ? 1 |

1.

The Wiethoff Company has a contract to produce 10000 garden hoses for a customer. Wiethoff has 4 different machines that can produce this kind of hose. Because these machines are from different manufacturers and use differing technologies, their specifications are not the same.

Write a constraint to ensure that if machine 4 is used, machine 1 will not be used.

Answer

Y1 + Y4 ? 0 |
||

Y1 + Y4 = 0 |
||

Y1 + Y4 ? 1 |
||

Y1 + Y4 ? 0 |

1.

Max Z = 5x1 + 6x2

Subject to: 17x1 + 8x2 ? 136

3x1 + 4x2 ? 36

x1, x2 ? 0 and integer

What is the optimal solution?

Answer

x1 = 6, x2 = 4, Z = 54 |
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x1 = 3, x2 = 6, Z = 51 |
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x1 = 2, x2 = 6, Z = 46 |
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x1 = 4, x2 = 6, Z = 56 |

1.

In a 0-1 integer programming model, if the constraint x1-x2 = 0, it means when project 1 is selected, project 2 __________ be selected.

Answer

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