These questions are excerpted from a quiz posted by Garrett MacKenzie at www.plastic411.com. The correct answers and your score will display at the end of this 15-question quiz when you click on "done." PlasticsToday thanks Garrett for allowing us to use part of his quiz.

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* 1. If a material ratio is identified at 25:1, or 4% color, the correct mixture would be:

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* 2. The orifice of a nozzle tip should be [fill in the blank] the sprue bushing orifice

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* 3. Color swirls can be caused by:

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* 4. What steps are taken to develop a decoupled molding process? (The term "decoupled molding" is registered by RJG Inc.) 

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* 5. A gate seal study is performed to

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* 6. A dryer that is working properly should:

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* 7. A material that is hydroscopic is prone to drawing in moisture and must be dried at the temperature and time determined by the material manufacturer.

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* 8. The purpose of process monitoring is:

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* 9. The glass transition temperature (Tg) is:

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* 10. Peak pressure is:

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* 11. Melt temperature is measured by:

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* 12. Shear heat from the screw rotation and back pressure supplies 70 to 90% of the total heat in the screw. Heater bands supply the rest and help prevent fluctuations.

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* 13. When venting a mold, what percentage of the cavity parameter should be vented and at what spacing?

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* 14. Gassing is common with many materials, such as nylon. How often should a mold be cleaned and checked for proper greasing?

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* 15. A burn at the flow front end of fill can be a sign of:

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