Digital Electronics - Signals and Switches

Exercise :: Signals and Switches - General Questions

16. 

The serial format for transmitting binary information uses:

A. a single conductor
B. multiple conductors
C. infrared technology
D. fiber-optic

Answer: Option A

Explanation:

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17. 

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: Option D

Explanation:

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18. 

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: Option B

Explanation:

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19. 

Serial communication can be sped up by:

A. using silver or gold conductors instead of copper
B. using high-speed clock signals
C. adjusting the duty cycle of the binary information
D. using silver or gold conductors instead of copper and high-speed clock signals

Answer: Option B

Explanation:

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20. 

What is the period of a clock waveform that has a frequency of 15.4 kHz?

A. 649 s
B. 6.49 s
C. 64.9 s
D. 0.649 s

Answer: Option C

Explanation:

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