CST CPM & PERT Schedule Development 2

Question 1

In PERT analysis, the Beta distribution is used because it:

Accepted Answer

Can model skewed distributions with defined minimum and maximum bounds

Answer

The Beta distribution is favored in PERT because it accommodates skewness and is bounded by the optimistic and pessimistic estimates.

Question 2

A project network has activities A→C, A→D, B→D, C→E, D→E. Which activities constitute the longest path if durations are A=3, B=2, C=4, D=1, E=5?

Accepted Answer

A→C→E with duration 12

Answer

Path A→C→E = 3+4+5 = 12, which is longer than A→D→E (3+1+5=9) and B→D→E (2+1+5=8).

Question 3

When performing a forward pass in CPM, the Early Start of a successor activity with multiple predecessors is determined by:

Accepted Answer

The maximum Early Finish among all predecessors

Answer

An activity cannot start until all predecessors are complete, so its Early Start equals the maximum Early Finish of all predecessors.

Question 4

In a Precedence Diagramming Method (PDM) network, a Finish-to-Start relationship with a lag of 5 days means:

Accepted Answer

The successor starts at least 5 days after the predecessor finishes

Answer

A positive lag on an FS relationship delays the successor's start by the lag duration after the predecessor finishes.

Question 5

Which of the following best describes 'free float' in CPM scheduling?

Accepted Answer

The amount of time an activity can be delayed without delaying any successor's Early Start

Answer

Free float is the delay an activity can absorb without pushing out the Early Start of any of its immediate successors.

(CST) Certified Scheduling Technician Practice Test