4. A handset switch is mounted in the handset of the local-battery telephone. It is located at this convenient
point so that the user may operate the switch while he is
5. The transmitter and receiver of most telephone sets are mounted in the handset. This arrangement tends
to increase the output of the transmitter because
a. the position of the receiver gives the transmitter a booster effect.
b. it assures the proper position of the transmitter while the user is speaking.
c. the user will speak louder when the receiver blocks room noise from one ear.
d. transmitters used in handsets are designed to be more efficient than those mounted in the telephone
6. The original models of the telephone did not have induction coils. The addition of the induction coil to
the telephone circuit has resulted in improvements in
a. range, efficiency, and performance.
b. intelligibility, range, and efficiency.
c. performance, intelligibility, and range.
d. efficiency, performance, and intelligibility.
7. A varying current in one winding of a telephone induction coil will cause an ac voltage in the other
winding. This transfer of electrical energy is a result of
a. mutual induction.
c. the common connection.
b. capacitive coupling.
d. the antisidetone principle.
8. Assume that a 90-volt, 20-hertz ac power source is connected to a transformer that has 25 turns in the
primary winding. If the secondary winding has 10 turns, the value of the secondary voltage will be approximately
a. 25 volts.
c. 50 volts.
b. 36 volts.
d. 225 volts.
9. If two local-battery telephone sets are connected as shown in figure 50 (TM 11-678), speaking into the
transmitter of telephone A will cause alternating current to flow in