Industrial Engineering and Production Management
Work sampling is applied for

Estimating the percentage of the time consumed by various job activities
All of these
Estimation of the percentage utilization of machine tools
Finding out time standards, specially where the job is not repetitive and where time study by stop watch method is not possible

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Industrial Engineering and Production Management
The important file in making a PERT is

No activity from any event can be started from preceding event till it is completed
All of the these
An event can't be accomplished until activities leading to it are completed
Length of arrow has nothing to do with time

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