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

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

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Industrial Engineering and Production Management
The correct sequence of phases in value engineering is

Investigation phase, information phase, creative phase, evaluation phase
Information phase, creative phase, investigation phase, evaluation phase
Creative phase, information phase, investigation phase, evaluation phase
Creative phase, investigation phase, evaluation phase, information phase

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Industrial Engineering and Production Management
Pessimistic time is

The most probable time considering all conditions
The average time required for a job
The maximum time which an activity might require
The minimum time in which an activity can possibly be accomplished

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