8. When using Telephone Set TA-264/PT, prearranged signals are used as part of the normal operating
procedures to interrupt the speaker. A telephone user desiring to interrupt the speaker must attract his
attention by
a. jiggling the hookswitch.
b. transmitting the word "break."
c. sending ringing current over the line.
d. requesting assistance from the operator.
9. What special action is recommended to insure a reliable electrical supply to Telephone Set TA-264/PT
when it is operated in subzero climates?
a. Provide additional insulation for the batteries.
b. Warm the batteries by body heat until ready to use.
c. Replace the batteries with low-temperature batteries.
d. Substitute an external power source for the battery supply.
10. Because of the complexity of Telephone Set TA-264/PT and the limitation of tool and spare parts,
maintenance that can be performed by the operator is minor. However, he may replace such items as
a. batteries.
c. handset cords.
b. binding posts.
d. generator handles.
11. To compensate for the higher attenuation of certain frequencies of a voice signal, the receiving amplifier
of Telephone Set TA-264/PT is designed to give greater amplification to these frequencies. The greatest
amplification is to frequencies in the range of approximately
a. 1,000 hertz.
c. 2,200 hertz.
b. 1,400 hertz.
d. 4,000 hertz.
12. When the amplifying telephone is to be used as a local-battery set without amplification, the filament
circuit to the vacuum tubes is open (fig. 21). This circuit is opened at the contacts of
a. switch S2.
b. wafer X of switch S1.
c. wafer Y of switch S1.
d. wafer Z of switch S1.
410 L5
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