Question

1. Select all true statements about plastic machining/ fabrication.

A. metal inserts are chemically bonded in plastic parts

B. large flat surfaces are generally preferred due to plastic's elastic modulus

C. curing time is determined from the thinnest wall section

D. raised letters on a plastic part incur less mold expense than depressed letters

E. parting lines should be placed along plastic part corners and edges

2. Select benefits of fabricating with plastics, ceramics, and composites.

A. one process can take raw material to finished product

B. complex shapes can be formed as a single unit

C. surface finishing can be avoided

D. forming temperatures are low compared to metals

E. high precision is possible

3. Select all true statements about plastic materials.

A.acrylic is usually blow molded

B. epoxies can be reaction injection molded

C. thermosetting sheets are used in thermoforming processes

D. polystyrene is foam molded

E. nylon can be pressed through small die holes

F. urethanes can be cast easily

4. Select all true statements about plastic processes.

A. injection molding is good for creating embossed designs on film

B. plastic parts with a solid skin and light core can be made by rotational molding

C. a distributor cap is a good candidate part for transfer molding

D. reaction injection molding can be used for both foam and no foam products

5. Select all forms of glass fabrication.

A. dry pressing

B. blow molding

C. tempering

D. extruding

E. hot-isostatic pressing

F. doctor blading

6. _______ is the process used to thin rubber parts with uniform thickness.

Answer 1

I 1) True statements about plastic machining ( fabrication in (C) Curing times is determined from thinnest wall section. O raised letters on a plastic part their less hold expense than depressed letters. A Parting lines should be placed along .. plastic part comers and eelgest 2) Benefits of fabricating with plastics, prosts Ceramics and composites. (③ complex. shapes can be formed as a single unit. (1) forming temperatures are low compared to metal. High precision is possible -

materials 3) True statements about plastic p er I (B epoxies can be ingen reaction injection molded. I (0) Polystyrene is foam molded. (f) Ovethanes can be cast easily. for 4) True statements about plastic process (6) Distributor cap is a good candidate part for transfegn melding te (1) reaction injection molding can be used both foam and no foam products 8) forms of glass fabrication. ® blow molding (e) Tempering and (A) Doctor blading 6) Compression molding is the process to thin rubber parts with wifors used thickness.