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** Note: If you want the answers to the Knowledge Test, please put in your e-mail address and we will e-mail you the answers.

Begin the Test:

1) What are the two modes of operation of the screw?
a.
b.

2) What part keeps the plastic from pushing back down the flights of the screw during the injection?
a. spring loaded nozzle
b. sprue bushing
c. screw tip
d. non-return valve

3) Should the nozzle or the sprue bushing have the larger internal opening diameter?
a. nozzle
b. sprue bushing

4) One way to keep the plastic from drooling out of the nozzle is to use a:
a. spring loaded nozzle
b. two piece nozzle
c. nozzle with a small orifice

5) Most screw drive motors are:
a. electric
b. hydraulic

6) List the three things that the screw does to the plastic.
a.
b.
c.

7) During the screw recovery phase, the screw is rotating and moving:
a. forward
b. backward

8) When the screw is rotating, which position is the non-return valve ring in?
a. forward
b. backward

9) How many heating zones are usually on a machine barrel?
a. 1
b. 3
c. 5
d. 7

10) The nozzle has the potential to lose a great deal of heat because:
a. it sticks out of the end of the barrel
b. it is in contact with the mold
c. it has no heater band of its own