The following PMP® exam sample question is taken from http://www.free-pm-exam-questions.com – The answer is at the very bottom:

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PMBOK Section: Sequence Activities
Process Group: Planning Process Group
Question Type: Calculation
Knowledge Area: Time Management
Difficulty Level: Moderate

Question: "Activity / Duration / Predecessor

A / 4 / START
B / 3 / A
C / 1 / B
D / 5 / START
E / 4 / D
F / 6 / E
G / 2 / C,F
H / 4 / D
I / 2 / H

What is the duration of the critical path?"

A. 10
B. 11
C. 17
D. 18

Hint : Use PDM to calculate.
Reference: PMBOK4 – pg:138

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The answer is C.
Explanation: The duration of the critical path for the given data is 17. Hence choice C is correct while rest of the choices are incorrect.