(From Lesson One: Injection End Parts and Their Functions)
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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