Industrial Engineering and Production Management
Time study is

The appraisal, in terms of time, of the value of work involving human effort
Time taken by workers to do a job
Machine setting time
Method of fixing time for workers

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Industrial Engineering and Production Management
Activity slack or float of any event on a PERT/CPM chart is represented by

Latest start time of succeeding event earliest finish time of preceding event activity time
Latest start time of the event earliest start time of the event
Anyone of the above
Latest finish time of event earliest finish time of the event

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Industrial Engineering and Production Management
In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if

Arrival and waiting times are known and can be grouped to form a waiting line model
Complete details of items in, waiting line are known
All variables and constants are known and form a linear equation
The laws governing arrivals, service times, and the order in which the arriving units are taken into source are known

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