Industrial Engineering and Production Management
Which of the following statement is correct about the network diagram?

The tail end of the arrow represents the start of an activity.
All of the these
The events are represented graphically by circles or nodes at the beginning and the end of activity by arrows.
The head of the arrow represents the end of an activity.

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Industrial Engineering and Production Management
Pick up the incorrect statement about advantages of work sampling

No time measuring devices are generally needed
Calculations are easier, method is economical and less time consuming
Permits a fine breakdown of activities and delays
Simultaneous study of many operators may be made by a single observer

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