14. Vacuum tube V2 is used to amplify received, or incoming, signals in the TA-264/PT. This tube does not
amplify the transmitted, or outgoing, signals because
a. the filament circuit is open.
b. contacts 3 and 4 of relay K1 shunt network L1.
c. the outgoing signal is canceled by the sidetone.
d. bypass capacitor C7 diverts the outgoing signals.
15. The incoming signals to Telephone Set TA-264/PT induce a voltage in the windings of transformer T3
(fig. 11). The component in this circuit which determines the gain of the signal is
16. Vacuum tube V3 provides the second stage of amplification for the received signal in the TA-264/PT. Its
output is fed to the telephone receiver through
a. choke L1.
b. capacitor C4.
d. potentiometer R12.
17. Outgoing currents for signaling the distant station are generated when the hand generator is turned. The
circuit for this current is closed at
a. contacts 1 and 2 of switch S2.
b. contacts 2 and 3 of switch S2.
18. Line faults and equipment faults are the major troubles encountered in telephone systems. A faulty line is
indicated when the user of a TA-264/PT receives
a. normal ringing but no speech signals.
b. no speech transmission and no ringing signal.
c. normal voice transmission but no ringing signal.
d. intermittent speech signals and normal ringing signals.
19. If Telephone Set TA-264/PT receives satisfactorily with amplification but does not transmit, a probable
trouble is a defective