Industrial Engineering and Production Management
In process layout

Routing and scheduling is more difficult
Production control is more difficult and costly
All of these
Handling and backtracking of materials is too much

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

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

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