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OPERATIONS RESEARCH
OPERATIONS RESEARCH
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1
Terminology: points of intersection of the problem
Adjacent CPF
Edge
Corner-point solutions
Constraint boundaries
2
The image refers to the ...
Minimum cost method
North-East rule
Vogel approximation method
Hungarian method
3
If yields represent earnings, select the maximum value decision
Decision 2
None
Decision 3
Decision 1
4
At what stage is historical data used to reconstruct the past?
Model testing and improvement
Preparation for the application of the model
Formulation of a mathematical model
Development of a computer-based procedure
5
Run Solver and choose the correct profit for ...
16,250
19,333
6,857
10,750
6
Lines connecting certain pairs of points or tasks
Arcs
Links
Undirect arc
Direct arc
7
Once the first customer order is filled, the dispatcher takes the order for the next customer.
Queueing theory
Single-server waiting line
Poisson probability distribution
Operating characteristics
8
Operations research problems are generally described in a vague and imprecise manner
True
False
9
Its a direct cost
none
ct system cost
cw waiting cost
cs service cost
10
Performance measure expressed as a mathematical function
Decision variables
Objective function
Parameters
Constraints
11
x1, x2 ... xn are ...
decision variables
parameters
global performance measure
constraints
12
Which assumption eliminates any geometric exponents other than 1 in the variables?
Divisibility
Proportionality
Additivity
Certainty
13
Arrival rate
None
k
λ
μ
14
Who developed the simplex method?
1947 by George Dantzig
1954 by Harry Markowitz
1939 by Leonid Kantorovich
1950 by Albert Tucker
15
What assumption does not accept cross product terms between two or more variables?
Proportionality
Divisibility
Additivity
Certainty
16
Operations research team works at the __________ level
advisory
academic
technical
internal
17
Algebraic solution: we perform Gaussian eliminations
Iteration 1: Step 3
Optimality Test
Iteration 1: Step 2
Iteration 1: Step 1
18
At what stage of the operations research study do we identify interesting patterns from relevant data?
Definition of the problem
Formulation of a mathematical model
Implementation
Model testing and improvement
19
The image refers to the ...
Vogel approximation method
Hungarian method
Minimum cost method
North-East rule
20
If yields represent loss, select the minimum expected yield
Decision 2
Decision 1
None
Decision 3
21
FCFS (first comes first served).
Poisson probability distribution
Operating characteristics
Queueing discipline
Single-server waiting line
22
Limitations on decision variables that are expressed in mathematical terms
Constraints
Sensitivity analysis
Parameters
Decision variables
23
Key Solution Concepts: the simplex method is an iterative algorithm
Solution concept 1
Solution concept 4
Solution concept 3
Solution concept 2
24
If a problem has one optimal solutions, at least two must be CPF solutions
False
True
25
Coefficients of the decision variables
Decision variables
Parameters
Constraints
Objective function
26
Terminology: limit of a corresponding restriction
Corner-point solutions
Edge
Constraint boundaries
Adjacent CPF
27
If you have 4 equations and 9 variables, how many degrees of freedom do you have?
4
5
0
None
28
Operations research is concerned with ...
the finance management
the operations management
the top management
the whole organization
29
A decision under certainty is one that ...
probability is unknown
probability is known
probability is estimated
probability is dcumented
30
The performance of an individual decision depends on ...
performance
nature
alternatives
decision
31
Conventional symbols are used to denote the components of the model
False
True
32
Transportation problem solves the distribution of any product (sources) to any group of reception centers (destinations)
False
True
33
In operations research all legitimate goal can only be translated into profit
True
False
34
Identify the critical path?
A-C-H
A-D-G
B-E-F-H
A-D-F-H
35
When formulating the model, what are the decisions to be made?
None
The number of used resources
The total profit or loss
The production rates
36
The image refers to the ...
Hungarian method
North-East rule
Vogel approximation method
Minimum cost method
37
What notation is applied to Poisson arrivals, general service, and a single server?
M/D/1
M/M/2
M/G/1
M/M/1
38
The image represents ....
a network representation
a parameter table
a mathematical model for the problem
none
39
Laplace criterion states that each state of nature has an equal number of probabilities
False
True
40
Key Solution Concepts: the simplex method focuses solely on CPF solutions
Solution concept 4
Solution concept 3
Solution concept 1
Solution concept 2
41
By how many weeks can task D be delay?
0
2
1
3
42
What type of decision model occurs most frequently?
Under low risk
Under pressure
Under uncertainty
Under certainty
43
Once the decision is made, we can changed it after the state of nature has occurred
False
True
44
Is a feasible solution that has the most favorable value of the objective function
Feasible region
None
Optimal solution
Feasible solution
45
What stage requires a high correlation between prediction and real life as part of the validation work of the model?
Implementation
Model testing and improvement
Formulation of a mathematical model
Definition of the problem
46
Average time a unit spends in the waiting line
L
W
Lq
Wq
47
Terminology: two adjacent CPF solutions are connected by a line segment
Adjacent CPF
Edge
Constraint boundaries
Corner-point solutions
48
At what stage of the operations investigation process we proposed a hypothesis?
Formulation of the problem
None
Construction mathematical model
Validation of the math model
49
Geometric solution: we choose (0, 0) as the initial CPF solution to examine
Iteration #1 step #2
Initialization
Iteration #1 step #1
Optimality Test
50
A common theme in operations research is that there is guarantee that it can implement the best solution.
True
False
51
Knowledge dealing with waiting lines is known as ...
Single-server waiting line
Poisson probability distribution
Queueing theory
Operating characteristics
