Signals and Switches Questions and Answers

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Showing 10 of 27 questions
Q11
The serial format for transmitting binary information uses:
  • A a single conductor
  • B multiple conductors
  • C infrared technology
  • D fiber-optic
Answer: Option A
Q12
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
Q13
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
Q14
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
Q15
TTL logic chips must have connections to Vcc and ground, even if all inputs and outputs are properly used and tied to valid signals.
  • A TRUE
  • B FALSE
Answer: Option A
Q16
An indication of cutoff in an NPN bipolar transistor is that the:
  • A collector current is maximum
  • B collector-to-emitter voltage equals zero
  • C base-to-emitter voltage equals 0.7 V
  • D collector to emitter appears to be open
Answer: Option D
Q17
Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector.
  • A positive, negative
  • B positive, positive
  • C negative, positive
  • D negative, negative
Answer: Option A
Q18
The abbreviation NO, when used with respect to electromechanical relays, stands for not operational.
  • A TRUE
  • B FALSE
Answer: Option B
Q19
In a graphical representation of voltage versus time, ________ is displayed on the ________ axis and ________ is displayed on the ________ axis.
  • A time, y, voltage, x
  • B voltage, y, time, x
Answer: Option B
Q20
What is the minimum voltage required before a diode will allow current to flow between the cathode and the anode?
  • A 0.7 V
  • B 0.07 V
  • C 4.3 V
  • D 0.2 V
Answer: Option A

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