17.
Two important advantages of a common-battery system over a local battery system are:
a.
more answering positions and faster answering.
b.
automatic signaling and faster answering.
c.
provisions for supervision and three conductor cords.
d.
automatic signaling and provision for supervision.
18.
Line signaling on a common-battery switchboard is usually accomplished with:
a.
auxiliary contacts.
b.
lamps.
c.
shutters.
d.
push to talk switch.
19.
When a telephone line terminates in a switchboard this terminal point is called a:
a.
plug.
c.
b.
jack.
d.
spade plug.
20.
There are two types of line jacks used. They are called:
a.
simple jacks and cut-off jacks.
b.
cut-off jacks and open jacks.
c.
auxiliary jacks and cut-off jacks.
d.
simple jacks and ring down jacks.
CHECK YOUR ANSWERS AGAINST LESSON 2 SOLUTION SHEET (PAGE 192) AND MAKE NECESSARY
CORRECTIONS.
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