Industrial Engineering and Production Management
The reasons which are basically responsible for the formation of a queue should be that

Output rate is linearly proportional to input
All of these
The average service rate Hess than the average arrival rate
Output rate is constant and the input varies in a random manner

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Industrial Engineering and Production Management
Critical Path Net Work helps an engineer

To be cautious for avoiding any delay in the critical activities to avoid delay of the whole project
To concentrate his attention on critical activities
All of these
To divert the resources from noncritical advanced activities to critical activities

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Industrial Engineering and Production Management
In order that linear programming techniques provide valid results

Relations between factors must be linear (positive)
Either (A) or (B)
Only one factor should change at a time, others remaining constant
Relations between factors must be linear (negative)

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