a. automatic dial.
c. manual local battery.
b. semiautomatic cord.
d. manual common battery.
8. Local lines in some local-battery telephone systems can be longer than those in common-battery systems
because the
a. line battery voltage is greater.
b. telephone earpiece is more sensitive.
c. hand generator provides greater signaling range.
d. loop resistance is less than the trunk resistance.
9. A headquarters at which a common-battery central office is normally used is
a. corps.
c. infantry brigade.
b. armor battalion.
d. infantry division.
10. Assume that you are comparing the characteristics of a manual telephone system with those of an
automatic dial telephone system. One advantage of the automatic dial system over the manual system is that the
automatic dial system
a. requires far less maintenance.
b. provides more rapid and accurate circuit switching.
c. reduces the amount of complex equipment needed for system operation.
d. minimizes intricate wiring and therefore reduces installation time.
11. One reason that small common-battery switchboards are arranged to permit connections to local-battery
switchboards and telephones is to achieve
a. centralized ringing.
b. flexibility of operation.
c. compatibility with dial systems.
d. increased distances of transmission.
12. A telegraph signal wherein current pulses vary from zero to a stated (peak) value is known as
a. polar.
c. marking.
b. neutral.
d. spacing.
13. The neutral telegraph system is used mostly for short transmission lines because
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