13.
An induction coil could be described as:
a.
consisting of two coils, a transformer coil and a secondary coil with a common connection.
b.
consisting of two coils, a transformer coil and a primary wound on a single iron core.
c.
consisting of one coil that does not pass direct current into the transmitting circuit wound on an iron core.
d.
consisting of two coils a secondary and a primary with a common connection.
14.
The primary difference between a common-battery switchboard and a local-battery switchboard is the:
a.
trunk circuit.
c.
battery supply.
b.
ringing machine.
d.
operator procedure.
15.
A switchboard cord contains three conductors and three contacts. These three elements are referred to as:
a.
tip, ring, and sleeve.
b.
positive, negative, and busy.
c.
tip, ring, and ground.
d.
positive, negative, and ring.
16.
In a common-battery system there are two important paths. They are:
a.
direct current path and a talking path.
b.
a talking path and a ringing path.
c.
direct current path and an automatic signaling path.
d.
a talking path and a filter path.
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