Discussion
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- Question
A diode placed in parallel across a relay coil serves what function?
Options- 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
- Correct Answer
- to protect the coil from arcing
- 1. In a graphical representation of voltage versus time, ________ is displayed on the ________ axis and ________ is displayed on the ________ axis.
Options- A. time, y, voltage, x
- B. voltage, y, time, x Discuss
- 2. TTL logic chips must have connections to Vcc and ground, even if all inputs and outputs are properly used and tied to valid signals.
Options- A. True
- B. False Discuss
- 3. Which device(s) have almost ideal ON and OFF resistances?
Options- A. electromechanical relays
- B. manual switches
- C. semiconductor devices (diodes and transistors)
- D. electromechanical relays and manual switches Discuss
- 4. The abbreviation NO, when used with respect to electromechanical relays, stands for not operational.
Options- A. True
- B. False Discuss
- 5. How many 2-input NOR gates does it take to produce a 2-input NAND gate?
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 6. The period of a waveform is the percentage of time the signal is HIGH.
Options- A. True
- B. False Discuss
- 7. What is the output voltage from the circuit in the given figure?
Options- A. +15 V
- B. +12 V
- C. +3 V
- D. 0 V Discuss
- 8. Internally, a computer's binary data are almost always transmitted on parallel channels, commonly referred to as the:
Options- A. parallel bus
- B. serial bus
- C. data bus
- D. memory bus Discuss
- 9. When an IC has two rows of parallel connecting pins, the device is referred to as a:
Options- A. QFP
- B. DIP
- C. TSSOP
- D. CMOS Discuss
- 10. Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector.
Options- A. positive, negative
- B. positive, positive
- C. negative, positive
- D. negative, negative Discuss
Signals and Switches problems
Search Results
Correct Answer: voltage, y, time, x
Correct Answer: True
Correct Answer: electromechanical relays and manual switches
Correct Answer: False
Correct Answer: 4
Correct Answer: False
Correct Answer: 0 V
Correct Answer: data bus
Correct Answer: DIP
Correct Answer: positive, negative
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