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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Question: A team member on the project is consistently delivering her work packages late and below the required quality standards. The issue has been discussed with her several times but no improvement was visible. As project manager you decide that it is time to employ coercive power. What measure will you implement?

  A. You punish her by removing the privilege to work from home for two days per week.
  B.  You bargain with her to give her better assignments if she performs.
  C. You discuss the situation with her line manager.
  D.   You ask the Human Resources department to step in.
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The Correct Answer is A

Explanation:French & Raven recognize five types of power: coercive, reward, legitimate, referent, and expert power. Coercive power is also known a penalty power, by which you punish someone.