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1 3.1 Consider the exterior door of a family house. The door is locked/unlocked by using a standard key.List all relevant functions of the door (including lock).List all relevant failure modes of the door.Classify the failure modes by using the classification system outlined in this chapter.Do you consider it relevant to include misuse failures? If “yes,” provide examples.

2 3.2 Consider a filter coffee maker/brewer that you are familiar with.List all potential failure modes of the coffee brewer.Identify potential causes of each failure mode.Identify potential effects of each failure mode.

3 3.3 Identify and describe possible failure modes of a (domestic) refrigerator.

4 3.4 Assume that your mobile phone is “dead.” Illustrate the possible causes of this fault by a cause and effect diagram.

5 3.5 Consider a smoke detector used in a private home and list possible causes of systematic faults of this detector.

6 3.6 Explain the differences between the terms failure and fault. Illustrate you explanation by practical examples.

7 3.7 Consider a domestic washing machine.Identify as many causes of potential failures as possible.Define categories of failure causes.Use these categories to classify the identified failure causes.

8 3.8 Suggest a technical system that can be divided into several levels of indenture. If you cannot propose anything better, you may use a family car. Assume that a specific component failure mode occurs in the system and exemplify the relationships that are illustrated in Figure 3.6.

9 3.9 Reconsider the coffee maker in Problem 3.2. When you press the on/off switch, no coffee is supplied.Analyze the “failure” by using a cause and effect diagram.Analyze the same “failure” by a root cause analysis.