Industrial Engineering and Production Management
Time study is carried out

All of these
By observing and recording the time taken by the operator for an operation
By breaking up each operation into small elements which are measurable with the help of the measuring device accurately
By finding all the significant informations regarding the job, work place and machine tool etc

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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

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

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