Exercise: Signals And Switches

Questions for: Signals And Switches

A diode placed in parallel across a relay coil serves what function?
A:
to regulate input voltage
B:
to protect the coil from arcing
C:
to ensure most of the current passes through the coil
D:
to reduce arcing across the relay contacts
Answer: B
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Which device(s) have almost ideal ON and OFF resistances?
A:
electromechanical relays
B:
manual switches
C:
semiconductor devices (diodes and transistors)
D:
electromechanical relays and manual switches
Answer: D
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The serial format for transmitting binary information uses:
A:
a single conductor
B:
multiple conductors
C:
infrared technology
D:
fiber-optic
Answer: A
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Determine the output voltage Vout for the circuit in the given figure.

A:
–0.5 V
B:
0 V
C:
+5 V
D:
+4.3 V
Answer: D
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What can a relay provide between the triggering source and the output that semiconductor switching devices cannot?
A:
total isolation
B:
faster
C:
higher current rating
D:
total isolation and higher current rating
Answer: D
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