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QUIZ
1. The Central Office senses that service is being requested when . . .
A - a dial tone is received.
B - a current flows in the local loop.
C - the telephone rings.
D - a 90VAC 20Hz ringing signal is received.
2. When the telephone goes off hook, the 48VDC on the tip and ring inputs . . .
A - reverse polarity.
B - drops to about 0.5V.
C - drops to about 1V.
D - drops to about 6V.
3. A pulse dialer sends pulses spaced at . . .
A - 1mS.
B - 2mS.
C - 100mS.
D - 500mS.
4. In a tone dialer . . .
A - the number of tones sent correspond to the digit being dialed.
B - each digit corresponds to a different tone.
C - the amplitude of the tone corresponds to the digit being dialed.
D - None of the above.
5. In the traditional rotary dial telephone the transmitter consists of . . .
A - the speaker amplifier is activated.
B - sound waves striking a diaphragm vary the resistance of the transmitter.
C - a buzzer changes dimensions.
D - sound waves striking the plate of a capacitor generates a voltage.
6. In the traditional rotary dial telephone, the transmitter consists of . . .
A - a speaker similar to those found in your radio and TV.
B - a piezoelectric buzzer.
C - a case filled with carbon granules.
D - an electret microphone.
7. In the traditional rotary dial telephone, the receiver consists of . . .
A - a speaker similar to those found in your radio and TV.
B - an integrated circuit.
C - an FET amplifier.
D - an electret microphone.
8. In an electret microphone . . .
A - the dielectric material holds a permanent electric charge.
B - sound waves striking a capacitor plate generates a voltage.
C - an FET transistor is mounted inside the microphone.
D - All of the above.
9. In the traditional rotary dial telephone, the ringing sound is produced by . . .
A - a piezoelectric buzzer.
B - the telephone speaker.
C - the electret microphone.
D - a hammer striking a bell.
10. The ringing signal from the telephone company Central Office consists of . . .
A - a 90VAC 20Hz signal superimposed on 48VDC.
B - a 5VAC 3kHz signal superimposed on 48VDC.
C - minus 24VDC.
D - a 3kHz signal.
A
10.
D,
9.
A,
8.
A,
7.
C,
6.
B,
5.
D,
4.
C,
3.
D,
2.
B,
-14-
1.
Answers:
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