Analysis of figure 84 shows that the input circuit to the send polar relay is connected to terminals:
5 and 4.
6 and 3.
2 and 7.
1 and 4.
The schematic diagrams in figures 85 and 86 have many similarities. However, one difference between them is
that in figure 86:
the send loop is entirely independent of ground.
battery does appear on the space contacts of the receive relays.
there is no series connection between selector magnets and keyboard contacts.
the direction of current flow is reversed in the send relay windings.
A teletypewriter circuit derived from using a telephone circuit and ground return is called a:
polar phantom teletypewriter circuit.
full-duplex teletypewriter circuit.
half-duplex teletypewriter circuit.
simplexed teletypewriter circuit.
In the circuit shown in figure 88, the teletypewriters will not interfere with telephones as long as the:
lines are balanced.
line windings are not center-tapped.
battery is removed from the teletypewriters.
teletypewriters use a full-metallic return circuit.
CHECK YOUR ANSWERS AGAINST LESSON 4 SOLUTION SHEET (PAGE 193) AND MAKE NECESSARY
HOLD ALL TEXTS AND MATERIALS FOR USE WITH EXAMINATION.