Discussion
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- Question
The silicon-controlled rectifier can be turned off
Options- A. by a negative gate pulse
- B. by forced commutation
- C. with the off switch
- D. when the breakover voltage is exceeded
- Correct Answer
- by forced commutation
- 1. RTDs are typically connected with other fixed resistors
Options- A. in a pi configuration
- B. in a bridge configuration
- C. and variable resistors
- D. and capacitors in a filter-type circuit Discuss
- 2. What is the zero-voltage switch used for?
Options- A. To reduce radiation of high frequencies during turn-on of a high current to a load
- B. To control low-voltage circuits
- C. To provide power to a circuit when power is lost
- D. For extremely low-voltage applications Discuss
- 3. Which of the following performance specifications applies to a sample-and-hold circuit?
Options- A. Aperture time
- B. Aperture droop
- C. Feedback
- D. Acquisition jitter Discuss
- 4. What device is similar to an RTD but has a negative temperature coefficient?
Options- A. Strain gauge
- B. Thermistor
- C. Negative-type RTD
- D. Thermocouple Discuss
- 5. Holding current for an SCR is best described as
Options- A. the minimum current required for turn-off
- B. the current required before an SCR will turn on
- C. the amount of current required to maintain conduction
- D. the gate current required to maintain conduction Discuss
- 6. The output voltage of a typical thermocouple is
Options- A. less than 100 mV
- B. greater than 1 V
- C. Thermocouples vary resistance, not voltage.
- D. None of the above Discuss
- 7. The connections to a thermocouple
Options- A. can produce an unwanted thermocouple effect, which must be compensated for
- B. produce an extra desirable thermocouple effect
- C. must be protected, since high voltages are present
- D. produce an extra desirable thermocouple effect and must be protected, since high voltages are present Discuss
- 8. Temperature sensing can be achieved by the use of
Options- A. thermocouples
- B. RTDs
- C. thermistors
- D. All of the above Discuss
- 9. A sine wave has:
Options- A. four quadrants
- B. two alternations
- C. one period
- D. all of the above Discuss
- 10. What is the waveform period difference between the 60 Hz electricity used in this country and the 50 Hz used in Europe?
Options- A. 3 ms
- B. 16 ms
- C. 4 ms
- D. 20 ms Discuss
Measurement, Conversion and Control problems
Search Results
Correct Answer: in a bridge configuration
Correct Answer: To reduce radiation of high frequencies during turn-on of a high current to a load
Correct Answer: Aperture time
Correct Answer: Thermistor
Correct Answer: the amount of current required to maintain conduction
Correct Answer: less than 100 mV
Correct Answer: can produce an unwanted thermocouple effect, which must be compensated for
Correct Answer: All of the above
Correct Answer: all of the above
Correct Answer: 3 ms
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