Q.

The plastic material commonly used for making gear wheels is –

A. Polyesters
B. Nylons
C. Bakelit
D. Polystyrene
Answer» B. Nylons
Explanation: Popular materials for plastic gears are acetal resins such as DELRIN, Duracon M90; nylon resins such as ZYTEL, NYLATRON, MC901 and acetal copolymers such as CELCON. The physical and mechanical properties of these materials vary with regard to strength, rigidity, dimensional stability, lubrication requirements, moisture absorption, etc.
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